Manual de Analisis Cuantitativo Tomográfico del EEG (qEEGT)
Contents
1. The norms are available for the monopolar recording montage as well as the average reference montage Screen description When the application starts the working screen is presented The module has a work area with 7 work sheets a horizontal menu tool bar information bar and status bar At the beginning of the working session the last analyzed study is loaded EEG Quantitative Analysis Application title Horizontal Menu fa EEG Quantitative Analysis Information bar ole File Edit view Patient Tools Help s QQWAY OS AS State A vl Raw v aP applied l Analysis Marrow Band 10 20 fproad Band Broad Band State Narg Band 10 20 Comparison All Map views Work area gt C TWDATA ALAR__ 0 The horizontal menu has verticals menus containing most of the commands available in the module However there are commands due to its use or its activation way don t appear at the menus All the commands are described in the Command description Tool bar The module has a tool bar with the most frequently used commands Open study Zoom out spectra Zoom in spectra Smooth spectra Locate maximum in spectra Locate minimum in spectra Scale map C e lt gt teHPPNp amp Change map palette NI EEG Quantitative Analysis mM Change map view d Movie Print preview Print Ufa A more detailed explanation will be given later in the command s description Status bar EEG Quantitati2. Add Color This button adds a new color in the palette When pressed opens the standard Windows dialog for selecting colors Once chosen the new color becomes the active color and is inserted after the previously active color It is disabled when the palette reaches the maximum of 256 allowed _ EEG Quantitative Analysis colors Delete Color This button erases the palette s active color The following color becomes the new active color This button is disabled when the palette reaches the minimum of 2 colors When pressing the Ok button a dialog for saving the recently edited palette is presented if any editing was carried out The palette files are stored as files LEV in the application s directory eS The palettes MAP RAINBOW and BIPOLAR can not be edited because they are used by default in the module Change map view 8 This command changes the map view When activated a submenu with 5 options Top Right Left Front and Back is displayed for selecting the new view Copy to window Copies the active map the map where the mouse cursor was placed when the command was activated to a floating window map Copy to All Map Views Copies the active map the map where the mouse cursor was placed when the command was activated to the All Map Views work sheet View in BRainbow Executes BRainbow system for displaying in three dimensions topographic maps Once initialized BRainbow loads the active topographic m
3. Studies Management See explanation in Studies Management on EEG Recording Chapter II Application Files See explanation in Application Files on EEG Recording Chapter II Exit Exits from module Edit Scale map 8 S This command scales maps When activated a dialog is shown that sets the scale type and its parameters 29 EEG Quantitative Analysis 30 Scale Map Scale type MaxMin Minimum 9150440 Maximum 3 9344043 Best Fit OK Cancel There are 4 scale types Scale MaxMin Threshold Percent Meaning In this scale type the values minimum and maximum for scaling the map are defined When this type is selected two edit boxes are shown Minimum and Maximum for editing the values The toggle Best Fit automatically adjusts the scale based on the extreme values of the map With this scale type is possible to focus on the positive and negative values in the map When this type is selected the edit box Threshold is shown to define the threshold that will be used as the scale limit in both directions positive and negative The toggle Best Fit automatically adjusts the scale based on the extreme value of the map With this scale type it is possible to work with the values of the map in relative rather than real magnitudes Conceptually it is similar to the MaxMin type but the values are scaled by percent For the percent conversion the maximum value of the map is taken as 100 converting
4. Once the dialog is closed with the Ok button the newly selected palette will become the active palette of the application If the Edit button is pressed the window is enlarged adding new controls to change the palette User s Manual QEEGT Version 5 0 3 EEG Quantitative Analysis 32 Change Palette Current MAP ka Palette selection Preview Preliminary Number of colors view 17 Active color Colors Current 0 Change color button iw Interpolated H Color movement buttons J Interpolation option x dd Color wa a and Delete color uttons Cancel Delete Color Edit button The first element that appears is a vertical bar divided by the quantity of real colors that compose the palette The colors are denoted in bottom up order from O to the number of colors 1 The number of colors is indicated in the box Colors Dragging the mouse over the cursor 4 to the right of this bar sets the active color The active color can also be selected with the edit box Current There are also 5 buttons for editing the palette C This button changes the active color When pressed opens the standard Windows dialog for selecting colors This button moves the active color up in the palette It is disabled when the active color is the last one in the palette This button allows moving the active color down in the palette It is disabled when the active color is the first one in the palette
5. are shown By using the option present at the information bar the desired measure can be selected Maps are displayed in a matricial way also where the roes correspond to the bands and the columns to the calculated states In order to facilitate the comparison a common scale is used for every band There are options at the information bar for selecting the transform to visualize as well as PG correction As in the Broad Band page is also possible to mark unmark maps for restricting the scope of several commands to the marked maps When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those e ements When the mouse cursor is over the map the derivation name and its value are shown at the status bar EEG Quantitative Analysis Broad Band State eas 1 2 20 2 20 2 20 GF AP Delta A WH GF AF Delta B uve Hz gt GF A amp F Delta C pW Hz 6 94 1 75 15 1 75 GF AP Theta A uv H2 GF AF Theta E uv H2 GF AF Theta C pW Hz E E 22 96 3 97 3 97 3 97 GF AF lpha pV vH2 GFAP Alpha H2 GFP AF AlphaC pve He 1 7 18 1 50 1 50 1 50 GP AP Beta pH gt GP AP Beta E WH GP AP Beta C uvetHe 37 46 E 37 46 10 77 10 77 10 77 GF AP Total WH GP AF Total B WH GF AP Total C Wwe Hz CATWDATA ALAR 1 O1 A12 2 271 Narrow Band 10 20 Comparison In this work sheet the CROSS and ZCROSS models can be
6. be given later in the command s description Information bar EEG Quantitative Analysis has an information bar with options relative to the current work sheet 50 EEG Quantitative Analysis Active tomography type Active state Active Broad Band measure state ra Raw Absolute Power GP applied bu Cortex amp Basal Ganglia T Active transformation raw or Z Work sheets EEG Quantitative Analysis has 7 works sheets Analysis Narrow Band 10 20 Broad Band Broad Band State Narrow Band 10 20 Comparison Narrow Band All and All Map Views but only at Analysis Narrow Band 10 20 the electrical tomography is calculated or visualized To know about the other work sheets see the EEG Quantitative Analysis chapter Analysis In this work sheet the electrical tomography models can be calculated The button Restore Defaults allows setting default values for models calculation valid for comparison with norms In this case the montages with average reference are considered default also because the ETC and ETCBG are calculated only with average reference montages Analysis Marrow Band Definition Broad Band Definition Models Spectral Resolution 0 390625 Hz Bands Init Freg Hz Final Freq H2 HJ aren Bend spedire Fermer We Marrow Band Spectral Parameters Z Transf iHi i Delta 1 56 Joe Initial Frequency 0 781250 Hz i Broad Band Spectral Parameters Final Frequency 19 14063 Hz Theta 3al fide iw B
7. iO State 4 Broad Band Spectral Parameters mm tespres ANE State 4 Narrow Band Spectral Parameters 55 EwS setup State Z Transformed Broad Band Spectral Paramete CD twdata State 4 2 Transformed Narrow Band Spectral Paramet ic ul Me core tp The Ok button loads the study selected at the central panel Add file to comparison 20 This command allows adding files spectra to the Narrow Band 10 20 Comparison work sheet When activated a dialog similar to the one shown for Open Study is presented In this dialog the right panel shows the different narrow band studies available for comparison EEG Quantitative Analysis Add file to comparison neuroscan 51 Program Files qee9 15 QEEGTSet 2 Recycled 51 RECYCLER 55 RoboHELP Ter Scan Data gt stacker 15 SUPPORT G System volum ot L ic tespres tw setup 5 twdata i ul iili OK Cancel Help The Open button loads in the next free position in the sheet the selected file Remove file from comparison With this command the files loaded at the Narrow Band 10 20 Comparison can be removed The first file can not be removed and the command is enabled when at least one of the files present in the sheet is marked The files can be marked by pressing the left button mouse over the map The maps following the recently removed if any are moved to the beginning in order to let the free slots to the end Import EEG This co
8. mean spectra corresponding to the age of the study EEG Quantitative Analysis Frequency 26 I Mean o7et He Std Dev 3 15 GF 0 781 Hz pv He2 Narrow Band All 5 8 a Oe AVE Gl AYE Oe AVE Pz AVE Pd AWE da 7 90 dl 2 43 ro Ps oR TE AWE Cg AF 744 4F Td AYE 2 63 wird 2 30 3 19 wil TS AWE PS AWE Poa Pora DE AWF 2 91 2 91 2 90 la 1 98 PFSR Te ANE Ta AvE 3 AWF PF Z A F aql Iad 3 65 cd 1 67 FZ avr Fa avr Fe avr T3 AWR Ti AWR ao 4 CHNEUROSCAM IGOZR2BF 462 305WP5 1 T When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those elements ne When the mouse cursor is over the map the derivation name and its value are shown at the status bar All Map Views This work sheet plots a topographic map using the five views available The top view is displayed in the bigger size and the rest using the medium size The sheet is initialized with the map corresponding to the first Spectra frequency but by using the Copy to All Map Views command is possible to update it 18 EEG Quantitative Analysis All Map Views GP AP Theta GP AP Theta GP AP Theta GP AP Theta cH GP AP Theta pv H2 C NEUROSCAN IGOZR2BF 462 30SWPS 0 Marking unmarking maps is not allowed in this sheet All the operations available for maps are carried out over all maps views When pressing the right
9. the rest of the values in relation to the maximum When this type is selected two edit boxes are shown Minimum and Maximum for defining the values in and the toggle Best Fit which when turned on causes an automatic adjustment based on the extreme values of the map EEG Quantitative Analysis Peak This scale type is similar to Percent but here it is possible Percent to determine the sign of the peak value that will be taken as the reference of 100 When this type is selected the edit box Minimum is shown to define the minimum value in the maximum is always 100 as well as a radio control Peak to set the sign of the peak value Change palette 0 EE Using this command is possible to change the active palette by selecting a new one or by editing the present one When this command is activated a dialog is shown with several controls an option list indicating the active palette s name the active palette s preview an option for interpolating the palette and the Edit button for editing the palette The palettes can use up to 256 colors If the palette does not have 256 colors as usual and the option for interpolating is set the application linearly interpolates the present colors up to 256 to obtain the palette that is actually used in the work sheets If the option for interpolating is not set the palette will be used without interpolation By means of the option list it is possible to select any one of the available palettes
10. to be opened doesn t have the files needed for calculation nor visualization Number of segments not optimum for X The number of segments for calculation in a given state should be greater or equal than the number of channels in the calculation montage Error reading file X File could not be read because of deletion or errors on disk Error writing file X File could not be read because of errors on disk or not enough available space on disk Study not found The study to be opened is not in the expected path Models don t have the same size Models to be exported must have the same dimensions ex same number of frequencies same number of bands same number of channels etc Maximum must be greater or equal than O In the Percent scale type maximum must be greater or equal than O User s Manual QEEGT Versi n 5 0 41 EEG Quantitative Analysis 42 Maximum must be greater than Minimum In the MaxMin and Percent scale types Maximum must be greater than Minimum Minimum must be greater or equal than O In the percent scale type Minimum must be greater or equal than 0 Minimum must be greater than O and less than 100 In the Peak Percent scale type Minimum must be greater than O and less than 100 Invalid Montage The montage selected for calculation can not be used because has more than 32 channels or is a bipolar montage No state selected At least one state must be selected for calculation No
11. visualized Here is possible to compare until 4 different spectra over the 10 20 system The spectra are plotted in the same window The first spectra loaded in the sheet corresponds to the current spectra shown in the Narrow Band sheet that s why whenever the active spectra in the Narrow Band is change this sheet is reset In this work sheet the windows where the spectra are plotted are also placed spatially resembling the 10 20 system but here the maps are displayed to the right With the radio button control present to the left of every window map is possible to set the current spectra for comparison The color of the radio button control indicates also the spectra s color 15 EEG Quantitative Analysis la la 16 The values shown on every window spectra are taken from the current vertical cursor position for the current spectra There are options at the information bar for selecting the transform to visualize as well as PG correction The commands Add file to comparison and Remove file from comparison add and remove different spectra respectively Narrow Band 10 20 Comparison Frequency Fp1 A12 Fp2 412 9 375 Hz 1 83 2 00 2 43 GP 3 375 Hz pv H2 3 35 2 43 GP 9 375 Hz pWE Hz 3 35 2 43 GP 3 375 Hz pv H2 C TWDATAVALAR__ 1 CiitwdatalALAR__ B 1 When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for t
12. 101 102 103 104 105 106 107 108 109 110 112 113 114 115 116 117 118 119 120 CP4 Cl C2 F5 F6 FC3 FC4 FCT FC2 CP5 CP6 PO7 PO8 EEG Quantitative Analysis EEG ELECTRICAL TOMOGRAPHY Introduction In TrackWalker it is possible to calculate and visualize the electrical tomography in the frequency domain see What is Electrical Tomography In the module EEG Quantitative Analysis several commands have been added to carry out the calculation and visualization of the electrical tomography Three new model types have been added Model Shorthand Meaning Electrical ETC This model localizes electrical sources only at Tomography the brain cortex of the average brain see over Cortex What Electrical Tomography is Electrical This model localizes electrical sources at the Tomography brain cortex as well as basal ganglia of the over Cortex average brain see What Electrical and Basal Tomography is Ganglia Electrical This model localizes electrical sources at the Tomography regions given by the Lead Field used over Individual Brain In addition the Z transform for every one of these models is calculated also A sizable difference between one observed parameter and the mean value in a population of normal subjects of the corresponding age is evidence of possible abnormality Z transform express this difference in standard deviation units facilitating its interpretation The mean values and
13. EEG Quantitative Analysis QEEGT User Manual Version 5 0 WYNEURONIC s a 2006 Introduction la EEG Quantitative Analysis has been designed for carrying out quantitative analysis of electrical activity The methods used are based on EEG spectral analysis using Fast Fourier Transform FFT and produce several numerical parameters as output These results are stored on different models that can be viewed and interpreted also with this module Models calculated with EEG Quantitative Analysis are Model Shorthand Meaning Narrow Band CROSS This model localizes frequencies where an spectral abnormal electrical activity is reached as well parameters as its spatial distribution avoiding the loss of frequency and spatial information inherent to the Broad Band Model Broad Band This model approximates spectra Narrow spectral Band spectral parameters as a constant over parameters certain frequency bands Includes Absolute Power Relative Power and Mean Frequency measures see Table below In addition the Z transform for every one of these models is calculated also A sizable difference between one observed parameter and the mean value in a population of normal subjects of the corresponding age is evidence of possible abnormality Z transform express this difference in standard deviation units facilitating its interpretation The mean values and standard deviations were obtained from regression equations against age in a
14. OSSAS MOD Ej ALAR CROSS A MOD Ej ALAR CROS5 4 4 MOD Ej ALAR _ CROS5 C 8 MOD Ej ALAR CROS5 B 1 MOL Files of type Narrow Band Models Cancel 2 Narrow Band Models Broad Band Models Broad Band Models ET Cortes Models Z ET Cortex Models ET Cortex amp Basal Ganglia Models Z ET Cortex amp Basal Ganglia Models All Models The selected models must belong to the same model type and the measures to export must have also the same dimension for every file Once the desired files are selected a dialog for selecting items to export is presented Depending on the model type different information appears on the dialog The figure shows in the upper part the dialog configuration for CROSS models and in the lower part the configuration for BBSP models By using the selection lists it is possible to set the item to be exported The dialog shows also 3 check boxes The first one GP Applied for setting the correction by Geometric Power With the second check box New line per value the user select if every value will appear in the output text followed by a return line or not The third check box Show labels 23 EEG Quantitative Analysis sets if the labels for each item are shown in the output text file In this case the first row in the file will show the label for every item If there is more than one file involved in the operation its filename will be shown at the beginning of the corresponding row in the output text fil
15. ale limit in both directions positive and negative The toggle Best Fit automatically adjusts the scale based on the extreme values of the tomography Tools Movie a This command makes a movie at the Narrow Band 10 20 Narrow Band 10 20 Comparison and Narrow Band All sheets The movie can be generated online or can be stored in an AVI file depending on the options set at the command Options Movie When the movie is carried out online all the frequencies selected according to the settings initial and last frame in Options Movie are displayed in sequence The movie is carried out using all the elements present including the tomography if present in the active work sheet When activated a small dialog is presented for allowing pausing and speed changes in the movie The movie is finished when the dialog is closed 56 EEG Quantitative Analysis View in BET Viewer amp amp This command executes the BET Viewer system for displaying in hi res the electrical tomography Once initialized BET Viewer loads the electrical tomography corresponding to the current frequency The command is disabled if BET Viewer is not installed E It is recommended not to close BET Viewer once loaded if the user wants to use it continuously together with EEG Quantitative Analysis in order to save time needed for BET Viewer to initialize Options This command sets different general options used in the module When activated a dialog with 3
16. ap the map where the mouse cursor was placed when the command was activated The command is disabled if BRainbow is not installed Change map size Changes the map size When activated a submenu with 3 options Little Medium and Big is displayed for selecting the new size The command is enabled only at the context menu in the floating window maps see command Copy to window 33 EEG Quantitative Analysis Smooth spectra 7 iii This commands smoothes spectra present in the active work sheet by means of a mobil average Smoothing is applied to all the waves present in the window To restore the original spectra use the Restore original command Zoom in wy amp Zoom out Q These commands change the amplitude of spectra present in the active work sheet The amplitude change is applied to all the waves present in the window To restore the original amplitude use the Restore original command Restore original The original spectra shape can be restored with this command It is also enabled in the Broad Band State work sheet for restoring original maps after executing the Difference command Move cursor right gt This command moves cursor to the next frequency in the work sheets plotting spectra Move cursor left lt This command moves cursor to the previous frequency in the work sheets plotting spectra Copy Ctrl C Copies the active work sheet content to the clipboard Copy to Copies the active work shee
17. ary view is presented showing the current appearance of the elements EEG Quantitative Analysis 36 Options Appearance Movie Misc Item Color Style Spectrum Signal ES Fat OK Cancel Help The tab Movie shows two combo boxes for selecting the initial and last frame to use in the movie When the check box Generate AVI file is set for selecting if the movie is carried out on line or not another two check boxes are enabled for selecting which elements will be present in the movie as well as a combo box for setting the speed Options Appearance Movie Mise W Generate AVI File Initial Frame 0 781 H gt W Animate Map jw Animate spectra Last Frame 19 141 Hz Frame rate 15 Fos o coca 6 In the tab Misc the background color for bitmaps saved with Copy and Copy to commands can be set as well as the threshold value for scaling maps by default when the Z Transform is set In addition it is possible also to set the default palettes for plotting images for raw and Z transformation a Options Appearance Movie Misc Background Map Threshold Current 3 50 Black M Default Palettes white Raw MAP Z Transf BIPOLAR Cancel Help EEG Quantitative Analysis The color background selection is used also for generating the movie with the Movie command 39 EEG Quantitative Analysis Error Messages 40 Access
18. button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those e ements rl When the mouse cursor is over the map the derivation name and its value are shown at the status bar EEG Quantitative Analysis Command description Fil Open study gt F1 Select the study to be analyzed When activated a dialog with 3 panels is presented The left panel allows to select the path where the studies to be analyzed are The central panel lists all the studies present in the path selected at the left panel If there is more than one analysis per study the different analyses are sorted by the order number The right panel shows for the study selected at the central panel detailed information about the study Open Study Study Information AAD 1 eee Date 2 17 2005 3 35 26 AM Initial Frequency 0 7613 Spectral resolution 0 390625 gt MyControls A gt neuroscan Program Files ALAR qeeg ALAR Frequencies 48 co Oo GEEST Set pas channels 19 a Recycled ALAR Montage ic RECYCLER ALOR Fol a R Fo2 4VR F3 AWYR F4 AYR C3 AWR C4 AWR F Gl AYR o AWYR FY YR Fo AYR TS AVR TA AWR TE CQ RoboHELP Ter FZ ANR CZ AWR PZ AVR Scan Data ALAR D AOA wom w4 A A Be w M e Eo ALAR bands 5 stacker iO ALAR Bands SUPPORT Delta Theta Alpha Beta Total System volum ALAR E AMC EEG recording
19. denied to X The X file could not be opened The most probable cause is that the file is already opened in another application or its attribute is Read Only Invalid color The color is already assigned to another element or is the same as the background window color Invalid Frequency Band cuts Some frequency band cuts for Broad Band calculation are outside the limits already set for Narrow Band Invalid High Cut Frequency Cut not valid because is not a valid number or the difference with the low cut is less than spectral resolution Invalid Low Cut Frequency Cut not valid because is not a valid number or the difference with any band cut is less than spectral resolution Invalid frequency cuts Some low cut frequency band is greater or equal than the high cut frequency for that band Derivations not included in recording montage Some derivations in the montage selected for calculation are not present in the EEG recording montage Invalid destination path Palette files can be saved only at the application path EEG Quantitative Analysis Invalid age for norming in X Patient s age is outside the limits for norming File does not match with previous models The file to be added to the Narrow Band 10 20 Comparison don t match with the files already loaded in that sheet Maybe different spectral resolution different starting frequency different number of frequencies etc Study can not be processed The study
20. e Select items to export Frequencies Derivations GP applied New line per value Show labels Select items to export Measures Derivations Export Absolute Power Relative Power Mean Frequency Cancel Help GP applied New line per value Show labels After selecting the items to export a dialog for selecting the output text filename is presented Another text file with the same name but with files extension will be created for indicating for every line in the exported text file the model filename that corresponds with that line Page setup With this command the appearance of the printed pages can be set When activated a dialog is presented for setting the different items left and top 24 EEG Quantitative Analysis margin as well as a logo bitmap for being printed at the top part of every page It must be taken into account that EEG Quantitative Analysis prints always in landscape orientation Page Setup Margins Left E mm Top 5 mm OK Cancel E E The top margin is added to the space occupied by the logo if any Print Setup This command sets the characteristics of the printer When activated a dialog that also sets the paper size and orientation appears Print Setup Printer Name HP Lazenlet 3300 Seres PCL E Properties Status Ready Type HP Lasenet 3300 Seres PCL E Where IP_130 102 159 91 Comment Paper Orientation Size Letter Po
21. en the mouse cursor is over the map the derivation name and its value are shown at the status bar Narrow Band All In this work sheet the CROSS ZCROSS ETC ZETC ETCBG and ZETCBG models are visualized and is enabled only if the loaded study has derivations not belonging to the 10 20 system All the spectra derivations are plotted and not only the 10 20 system The windows for plotting the spectra are placed in a matricial way following the montage order The topographic map showing the spatial distribution of the current vertical cursor position as well as the electrical tomography are displayed also 53 EEG Quantitative Analysis Marrow Band All Frequency 2 984 Hz Ex p 51 REF 52 REF 4 03 4 36 EE CE REF El ER REF 5 04 4 05 Ea EEF 54 REF EO REF 5 56 5 44 4 88 N When pressing the right button mouse over the different elements at the work E sheet a pop up menu will be displayed with the available commands for those elements When the mouse cursor is over the map the derivation name and its value are IE shown at the status bar 54 EEG Quantitative Analysis Command description The commands for working with the electrical tomography as well as the commands with added functionality will be described in the following Fil Export to text This command exports to text ASCII files the content of the different models generated with
22. hose e ements When the mouse cursor is over the map the derivation name and its value are shown at the status bar As in the other sheets that plot maps it is also possible to mark unmark maps for restricting the scope of several commands to the marked maps EEG Quantitative Analysis Narrow Band All In this work sheet the CROSS and ZCROSS models are visualized and is enabled only if the loaded study has derivations not belonging to the 10 20 system All the spectra derivations are plotted and not only the 10 20 system The windows for plotting the spectra are placed in a matricial way following the montage order The topographic map showing the spatial distribution of the current vertical cursor position is displayed also There are options at the information bar for selecting the state to visualize the transformation raw or Z as well as PG correction Depending on the calculated variants for the loaded study these options will have available the different possibilities When the Z transform is selected two horizontal bars are plotted for every window indicating the thresholds 1 96 and 1 96 respectively When the raw transformation is selected it is possible also to plot the mean and standard deviations of the normal population over the current spectra This is possible only if the loaded study can be compared with the norms The interval represented by the standard deviations is obtained from adding and subtracting 1 96 to the
23. in the movie The movie is finished when the dialog is closed Locate Locate EEG Quantitative Analysis When the movie is stored on AVI files a dialog for selecting the AVI filename is presented first After that the movie is carried out and stored frame by frame on the AVI file for its posterior visualization on any player maximum in spectra 8 A This command places the vertical cursor on the frequency where the amplitude maximum is reached in the spectra at the Narrow Band 10 20 Narrow Band 10 20 Comparison and Narrow Band All sheets minimum in spectra 8 Y This command places the vertical cursor on the frequency where the amplitude minimum is reached in the spectra at the Narrow Band 10 20 Narrow Band 10 20 Comparison and Narrow Band All sheets Montage This command allows montage edition When activated the montage selected if only one at the Analysis work sheet is loaded in the Montage edition dialog see Montage in EEG Recording Chapter Il If there is more than one montage selected then the Montage edition dialog is presented with all the derivations of the 10 10 system available for editing Options This command sets different general options used in the module When activated a dialog with 3 tabs is presented The tab Appearance allows setting color and style of different elements used in the module The combo box Element selects the element to be changed At the central part of the tab a prelimin
24. low adding and deleting bands respectively The button Restore Defaults allows to set default values for CROSS and BBSP models valid for comparison with norms In this case the RECORD montage as well as montages with average reference are considered default also Analysis Marrow Band Definition Broad Band Definition Models Spectral Resolution 0 390625 Hz Bands nt Freg iHz Final Freg Hz EY Vena benn pedia Fereme zis Initial Frequency 0 781250 Hz 3 91 rte W Broad Band Spectral Parameters Z Transf Final Frequency 19 14063 Hz Monkagets W Marrow Band Spectral Parameters 2 Transf W Broad Band Spectral Parameters zal 12 50 12 59 19 14 Overwrite previous models 1020 10 20 System 1 32 Channels 1 to 32 64 64 channels Calculate AUSTRAL Montaje de los Australian Add Band Delete Band 1 56 19 14 Restore Defaults States Calculate From do emmo e gee pecording 4 eves closed 25 512 i Marrow Band Spectral Parameters DIE eves opened E 512 lc hyperventilation 1 6 512 B CATWDATAALAR In the group Models the models available for calculation are selected The CROSS model is always calculated The states desired for calculating models are selected in the group States Only states with windows marked for analysis in the EEG recording appear in the group The Id column has the letter identifying the state as well as its description The column Segment Inf
25. mmand allows importing EEG recordings stored in other formats for analysis These EEG recordings can be in EEG and CNT Neuroscan formats as well as ASCII files When activated the command presents a dialog for selecting the filename and file type The text ASCII files must have the following characteristics e as many lines as bursts or samples in the file Neuroscan is a registered trademark and protected property of its rightful owner User s Manual QEEGT Version 5 0 21 EEG Quantitative Analysis 22 e every line will have separated by spaces all the values present in the burst As many as EEG recorded channels e at the beginning of the file additional lines can be present but will be ignored when processed After selecting the file data type and filename a dialog is presented for entering information needed about the EEG to import Patient and recording data Mame Gender Male gt Import Birth date 1 7 7980 Age 22 28 Cancel Record date 4 15 2002 Montage 1020 10 20 System Sampling rate 200 Hz Help State A eyes closed Lines to skip E The fields Name Gender Birth date and Recording date allow entering the minimum information for filling patient s clinical data The Lines to skip field allow to set the number of lines that will be ignores at the beginning of the file With the Montage field is possible to select a montage for describing the EEG recording to be impor
26. montage selected At least one montage must be selected for calculation No valid montages for processing None of the selected montages is valid for calculation No norm available for X No norm available for X combination in the module No windows marked for analysis The loaded study doesn t have any analysis window marked for calculation Palette files not found Palette files not found in the application path EEG Quantitative Analysis Invalid number of segments for state X The number of segments available for calculation for X state is not enough for calculation Invalid Band name Band name not defined Invalid filename The MAP RAINBOW and BIPOLAR palettes can not be changed because they are used by default in the module Invalid spectral resolution The spectral resolution to be set is not valid because is not a valid number or is less than O Invalid paper size Paper size selected for printing doesn t have the minimum size needed Threshold must be greater than O In the Threshold scale type the value defined must be greater than O Invalid value The edited value is not a valid number X is needed for executing the program The application will be aborted because the X file is not present X is not the main program The X application can not be executed as main program 43 EEG Quantitative Analysis Montages availables for comparison with EEG Norms EEG recordings must be ca
27. normal population The sign of the Z magnitude indicates direction of possible abnormality excess or defect If the observed parameter follows a Normal distribution probability Z values will be inside the interval 1 96 1 96 with a 0 95 probability when the subject is normal For a correct comparison with the norm Z transform calculation is very important to follow the reguirements for such comparison see Comparison with EEG norms EEG Quantitative Analysis The shorthands corresponding to the models calculated with Z transform are ZCROSS and ZBBSP respectively for each of the previous described models Broad Band Measures Table Measure Shorthand Meaning Absolute AP Is the measured energy for each derivation on Power every frequency band calculated in uV2 Hz Relative RP Express proportion of Absolute Power in the Power band with respect to the Total Absolute Power for every derivation it indicates contribution from every band to the total power Mean Is the gravity center for band expressed in Frequency Hz The module also calculates the Geometric Power GP which represents the EEG mean energy for every derivation and frequency This magnitude is a scale factor depending on the frequency band decrease with age and explain more than 40 of the EEG variance in subjects with the same age Correction with this factor is convenient for decreasing data variability without loosing its temporal and spatial st
28. o has the number of valid segments available for calculating models Between parentheses the segment length is presented in this field The number of valid segments as well as the segment length depends on the EEG sampling period and the spectral resolution as EEG Quantitative Analysis explained before see Spectral Resolution parameter If the spectral resolution is changed the segment information is updated accordingly in the group States In the group Calculate from the starting point for calculating is selected There are 3 possibilities depending on the specific situation calculate from EEG recording calculate from a previous calculated CROSS model and calculate from an imported file if the Import EGG command was used previously When calculating from a CROSS model the Narrow Band parameters are taken from the starting model and thus the parameter s edition is disabled In this case the group States only shows the state identifier because the segment information doesn t have any sense When the option Overwrite previous models is selected all the models calculated in previous working sessions are deleted The Calculate button starts the calculation process which can be aborted by using the Cancel button present in the progress window When the process is finished the user is prompted to load the recently calculated models Moreover with the Analysis log command View menu is possible to get information about the calculation pr
29. ocess Narrow Band 10 20 In this work sheet the CROSS and ZCROSS models are visualized with the restriction that only the channels belonging to the 10 20 system are shown The windows where the spectra are plotted are painted with a spatial distribution corresponding to the 10 20 system On every window the derivation name as well as the current value of the vertical cursor are displayed The horizontal axis shows divisions indicating the limits for the classic bands 6 0 0 B The vertical cursor can be placed over the different frequencies by using the left button mouse or by selecting the desired frequency in the Frequency box selector The topographic map shows the distribution corresponding to the current frequency Initially the map is scaled to the best possible fit over the whole spectra see command Scale map There are options at the information bar for selecting the state to visualize the transformation raw or Z as well as PG correction Depending on the calculated variants for the loaded study these options will have available the different possibilities User s Manual QEEGT Versi n 5 0 11 EEG Quantitative Analysis When the Z transform is selected two horizontal bars are plotted for every window indicating the thresholds 1 96 and 1 96 respectively When the raw transformation is selected it is possible also to plot the mean and standard deviations of the normal population over the current spectra This is possible onl
30. of Variable Resolution Electromagnetic Tomography VARETA en Clinical Electroencephalography Vol 32 No 2 pp 47 61 de Bosch Bayard J Valdes_Sosa P y cols DISCLAIMER BET software is designed for use in medical research it has not the status of a medical product i e it is not allowed to use it directly or indirectly for medical prevention diagnostic and or treatment of humans It is solely for academic use in the field of scientific research NEURONIC S A does not grant warranty or assume liability for the results of using the software The Z Transform is calculated for the ETC and ETCBG models ONLY with the average reference montage 49 EEG Quantitative Analysis Screen description When the application starts the working screen is presented The module has a work area with 7 work sheets a horizontal menu tool bar information bar and status bar At the beginning of the working session the last analyzed study is loaded Horizontal Menu Information bar Application title O EEG Quantitative Analysis File Edit View Patient Tools Help wer QAWAY adev las state Raw v GP applied Only Cortex Analysis Marrow Band 10 20 Broad Band Broad Band State arrow Band 10 20 Comparison All Map views Work area Status bar MM C TWDATAVALAR__ 0 Tool bar At the toolbar the following commands will be added sa View in BET Viewer A more detailed explanation will
31. ording to the 10 20 system Fpl Fp2 F3 F4 C3 C4 P3 P4 O1 O2 F7 F8 T3 T4 T5 TO FZ CZ PZ or by using the recording caps supported by the system see Montages availables for comparison with EEG Norms As reference linked ear lobes should be used A12 Recording impedance should not be higher than 5 kQ The recording s quality should be monitored constantly and the recording time should be divided in the following way Eyes closed Recording time should be long enough to obtain minute and half artifact free recording equivalent to 24 seconds Daily practice indicates an average recording time between 3 5 and 5 minutes in this state Eyes open Recording time should be long enough to carry out the following procedure 6 times open eyes during 12 seconds followed by another 12 seconds with eyes closed One to two minutes should be enough to get 12 segments ready for calculation artifacts free EEG Quantitative Analysis Sampling period should be 5 or 10 ms With these characteristics the obtained EEG recording can be used to compare with the EEG norms A good segment selection assures higher accuracy for determining the distance between the subject and the normal values for his age After installing TrackWalker the default definitions allow the comparison with norms These definitions are Spectral Resolution 0 390625 Hz Low Cut frequency 0 78 Hz High Cut frequency 19 14 Hz Low Cut Frequency High Cut frequency
32. page the following information is present in the page header work sheet name application name logo patient name age recording date and model filename Print amp amp Ctrl P 26 Prints work sheets see Print preview as well as Clinical Data and Conclusions When activated a dialog is presented for selecting the elements to print Print Patient Paper use We Clinical Data f Same page We Conclusions f Different pages Analysis corel toe The group Paper use is enabled when Clinical Data and Conclusions are selected and also the Conclusions were edited using WordPad Conclusions see command Conclusions were edited with Microsoft Word then always different pages will be used If Analysis is selected work sheets another dialog is presented for setting the printer options as well as the pages to print EEG Quantitative Analysis Print 2 leg Printer Hame HP Laserlet 3300 Seres PCL E ie Properties Status Ready Type HF Lazerndet 3300 Seres PLL E Wher JP 150102195 Comment Print to file Print range Copies i All Humber of copies 1 C Pages from 1 to 5 1 3 Selection pi pi pi Cancel When the option Selection is set at the group Print range only the current work sheet will be printed For selecting the work sheets by number the same convention explained in the Print Preview command should be used After pressing Ok the printing begins
33. road Band Spectral Parameters 2 Transf Alpha 7 81 12 50 i Electrical Tomography Montage s lw Electrical Tomography Z Transf AUSTRALIS Montaje de los Austra Beta 12 59 19 14 AVERAGE 10 20 System Total 1 56 19 14 M Only Cortex AVERAGENS 10 20 System Iw Cortex amp Basal Ganglia CMR 10 20 System CMR CMRE4NEW 64 channels new w Add Band Delete Band Overwrite previous models Restore Defaults iw Use average brain States Calculate From Lead Field Filename Segment Info FEE Rewnetac eyes closed 25 512 EE Desses opened 8 512 f Narrow Band Spectral Parameters Calculate Jc hyperventilation i 6 5123 a CATWDATAVALAR User s Manual QEEGT Version 5 0 51 EEG Quantitative Analysis la In the group Models the models available for calculation are selected When the Z transform of any electrical tomography modality is selected then the Z transform ZCROSS is selected automatically When the option Use average brain is not selected the electrical tomography will be calculated over an individual brain instead of the average brain In this case the edit box Lead Field filename must be used for indicating the lead field file to use for calculating the electrical tomography The option will be enabled only when not using average brain The Lead Field is calculated outside the EEG Quantitative Analysis The ETC and ETCBG as well as its Z Transforms will be calculated onl
34. rried out with the 10 20 montage or a subset from that montage or with a montage given by the EEG caps 64 and 128 channels supported by the system for being able to be compared with the EEG norms The following figure shows the naming convention used by the system for montages with multiple channels EEG caps The figure shows the 118 channels for whom the EEG norms are available Channles are named by an ordinal number between 1 and 120 56 and 57 are not available for comparison with norms The following table shows the correspondence between the naming convention used by the system and other naming systems 44 Naming system convention O CON DO WU A WW N W N N N N N N NNN N FF ma 27 oO O o N OAU A U N lt O O O NOUN HRW N Other naming systems convention Fpl Fp2 F3 F4 C3 C4 P3 P4 Ol O2 F7 F8 T3 77 T4 T8 P7 P8 FZ CZ PZ FI F2 P1 P2 AF3 AF4 Naming system 61 62 63 64 65 66 67 68 69 70 71 2 3 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 EEG Quantitative Analysis Other naming FPZ AFZ FCZ CPZ POZ OZ PO3 PO4 CP CP2 CP3 systems 45 EEG Quantitative Analysis 46 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 5 52 53 54 55 56 57 58 59 60 FT FT8 P5 P6 FC5 FC6 C5 Co FEZ TP8 PO5 PO6 AF7 AF8 9 92 93 94 95 96 97 98 99 100
35. rtrait Source Auto Select Landscape Network Cancel Print preview 8 L This command replaces the main window of the application for a window where a preview shows the work sheets as they would look on paper when 25 EEG Quantitative Analysis printed The window has a toolbar with commands for adjusting the preview 26 EEG Quantitative Analysis Print preview tool bar One page activation Previ iis Next Zoom selection page page Two page Full screen activation Current sactivation page s indicator Print all pages Close dom page s 1 OO ico Ej 4 Close preview O EEG Quantitative Analysis Narrow Band 10 20 Track Walker 5 0 NEURON sa Name AMA OCIA ALPAREZ RAMIREZ Age 40 61 Recording date 7 Mar 2001 Study ALR Frequency 7 813 Hz eyes closed GP 7813 H pH FZ AR 0 73 All the work sheets are printed using only one page excluding the Narrow Band All sheet that could take more than one page depending on the number of channels For identifying with the numbers every work sheet the following convention is used 1 Narrow Band 10 20 2 Broad Band 3 Broad band state 4 Narrow Band 10 20 Comparison and 5 Narrow Band All that could take several pages if needed EEG Quantitative Analysis Depending on the mouse cursor image EN or a when pressing the left button mouse the page zoom will be increased or decreased respectively For every
36. ructure Using this scale factor decrease the possibility for taking as abnormal increments on spectral energy in patients with wide basal EEG or sensible decrements for such energy in patients with low amplitude EEG At the same time allows that more details can be obtained about Z transform topographic distribution by using scales with energy absolute values substantially lower than generated with CROSS and BBSP models The GP is stored for every model as another measure allowing the model observation with or without it For BBSP models it is only applied to Absolute Power measure All analysis results are stored in files with MOD extension corresponding to the different calculated models Files generated have the following naming convention EEG Quantitative Analysis lt study name gt lt model shorthand gt lt state gt lt order number gt MOD where lt study name gt original name of the study when the EEG was recorded lt model shorthand gt shorthands already described for every model lt state gt letter A B C corresponding to the processed state lt order number gt indicates the number assigned to the analysis result for every working session With this mechanism it is possible to keep old results obtained in previous analysis sessions Comparison with EEG norms The EEG should be recorded with the subject in a resting state dec bito supine position or seated The recording electrodes should be placed acc
37. s See explanation on Conclusions on EEG Recording Chapter Il 35 EEG Quantitative Analysis Tools Mark all Marks simultaneously all the maps in the active work sheet Unmark all Unmark simultaneously all the maps in the active work sheet Show hide channels This command shows the channels positions over the maps It is a toggle when the positions are shown using the command hides them Difference This command carries out the difference between two maps When activated shows a submenu with the two possible subtractions The result is presented in a floating window map State Difference The command is enabled only at the Broad Band State work sheet When activated a subtraction is carried out between all the states present in the sheet and the state marked The map windows in the sheet are replaced by the new maps obtained with the subtraction Movie 36 This command makes a movie at the Narrow Band 10 20 Narrow Band 10 20 Comparison and Narrow Band All sheets The movie can be generated online or can be stored in an AVI file depending on the options set at the command Options Movie When the movie is carried out online all the frequencies selected according to the settings initial and last frame in Options Movie are displayed in sequence The movie is carried out using all the elements present in the active work sheet When activated a small dialog is presented for allowing pausing and speed changes
38. sed for calculating The valid segment length SL can be defined as SL SP SR where SP is the EEG sampling period Hz and SR is the spectral resolution Initial Frequency Defines the first spectral frequency to obtain It should be higher or equal to the low cut frequency used in the EEG recording Besides can not be less than the spectral resolution used Final Frequency Defines the last spectral frequency to obtain It should be less or equal to the high cut frequency used in the EEG recording The user can change freely the parameter s values always keeping in mind the restrictions already explained but in order to be able to calculate Z transform the default values must be used In the Montage list all the available montages in TrackWalker are displayed The RECORD montage is always present and indicates the original montage used for EEG recording As many montages as desired can be selected for calculating the models All the files models generated for each montage will have a common order EEG Quantitative Analysis 10 number In the group Broad Band definition the parameters for calculating BBSP and ZBBSP models are set The user can define the bands and its limits The bands can be overlapped and the Total band doesn t have to cover the full range defined by the others As in Narrow Band definition default values must be used in order to be able to calculate Z transform The buttons Add Band and Delete Band al
39. standard deviations were obtained from regression equations against age in a normal population The sign of the Z magnitude indicates For obtaining EEG Electrical Tomography the TrackWalker distributor should be contacted EEG Quantitative Analysis direction of possible abnormality excess or defect If the observed parameter follows a Normal distribution probability Z values will be inside the interval 1 96 1 96 with a 0 95 probability when the subject is normal For a correct comparison with the norm Z transform calculation is very important to follow the reguirements for such comparison see Comparison with EEG norms in Chapter V The shorthands corresponding to the models calculated with Z transform are ZETC and ZETCBG respectively for each of the previous described models The module also calculates the Geometric Power GP which represents the EEG mean energy for every derivation and frequency This magnitude is a scale factor depending on the frequency band decrease with age and explain more than 40 of the EEG variance in subjects with the same age Correction with this factor is convenient for decreasing data variability without loosing its temporal and spatial structure Using this scale factor decrease the possibility for taking as abnormal increments on spectral energy in patients with wide basal EEG or sensible decrements for such energy in patients with low amplitude EEG The GP is stored for ever
40. t content to a bitmap file When activated a dialog for selecting the filename is presented The dialog gives the possibility to inspect using a preview files already present on disk 34 EEG Quantitative Analysis Vie Toolbar This command works as a toggle when turned on the toolbar is visualized under the horizontal menu of the application otherwise the toolbar is hidden leaving more space on screen for work sheets visualization Status bar This command works as a toggle when turned on the status bar is visualized in the bottom of the main window application otherwise the status bar is hidden leaving more space on screen for work sheets visualization Information bar This command works as a toggle when turned on the information bar is visualized below the toolbar otherwise it is hidden leaving more space on screen for work sheets visualization Full screen When activated the window application is maximized hiding the horizontal menu the toolbar the information bar and the status bar leaving more space on screen for work sheets visualization To return to normal modem the Esc key should be pressed Analysis Log This command is enabled after every calculation in the Analysis work sheet Shows all the incidences during the calculation process errors warnings suggestions etc as well as the models generated Patient Clinical Data See explanation on Clinical Data on EEG Recording Chapter Il Conclusion
41. tabs is presented The tab Movie shows two combo boxes for selecting the initial and last frame to use in the movie When the check box Generate AVI file is set for selecting if the movie is carried out on line or not another two check boxes are enabled for selecting which elements including the electrical tomography will be present in the movie as well as a combo box for setting the speed Options Appearance Movie Misc if Generate AVI File Initial Frame 0 781 Hz W Animate Map W Animate spectra Last Frame 19 1 41 He W Animate tomography Frame rate 15 Fps EEG Quantitative Analysis Error messages No tomography available for X Electrical tomography calculation is not available for the X combination 56
42. ted If the right montage is not available it is possible to create a new one with the option existent for that in the combo box In this case the dialog for creating and editing montages is presented see Montage in EEG Recording chapter The Import button stats the importation process After that the Analysis work sheet can be used for calculating This command doesn t make a conversion to the PLG native format used in TrackWalker When importing from Neuroscan formats the system will read all the needed information from the original files If data relative to age birth date and recording date are not filled adequately a warning message will be issued In this case the user must use the Clinical Data command in the Patient menu for correcting the information The only one data that should be entered by the user during the importing process is the wakefulness state of the patient during the recording EEG Quantitative Analysis Export to text This command exports to text ASCII files the content of the different models generated with the module In this way the processing results can be used in statistical packages reports papers etc When activated a dialog is presented for selecting the models to be exported as well as its type Select models to export Look ir twdata ek Ej ALAR CROS5 4 0 MOD Ej ALAR CROS5 B 5 MOD Es ALAR CROSS 4 1 MOD E ALAR CROS5 B 6 MOL Ej ALAR CROSS 4 2 MOD Ej ALAR ROSS MOD Ea ALAR R
43. the module In this way the processing results can be used in statistical packages reports papers etc When activated a dialog is presented for selecting the models to be exported as well as its type The selected models must belong to the same model type and the measures to export must have also the same dimension for every file Once the desired files are selected a dialog for selecting items to export is presented Depending on the model type different information appears on the dialog The figure shows the dialog for selecting items in the ETC and ETCBG models Select items to export Frequencies SOUrCES Export Cancel Help GP applied New line per value 55 EEG Quantitative Analysis Edit Scale tomography With this command the electrical tomography can be scaled When activated a dialog for selecting the scale and its parameters is presented There are 2 scale types for tomography Scale Meaning MaxMin In this scale type the values minimum and maximum for scaling the tomography are defined When this type is selected two edit boxes are shown Minimum and Maximum for editing the values The toggle Best Fit automatically adjusts the scale based on the extreme values of the tomography Threshold With this scale type is possible to focus on the positive and negative values in the tomography When this type is selected the edit box Threshold is shown to define the threshold that will be used as the sc
44. ve Analysis has a status bar for showing information about the study being analyzed Map derivation value Open study active a DATWDATAMALAR ea 4 81 g DATWD atat ALAR dd AA Map derivation Comparison study name Information bar EEG Quantitative Analysis has an information bar with options relative to the current work sheet Band measure State ray Raw absolute Power GP applied Active transformation raw or Z Work sheets EEG Quantitative Analysis has 7 works sheets Analysis Narrow Band 10 20 Broad Band Broad Band State Narrow Band 10 20 Comparison Narrow Band All and All Map Views At the beginning of the working session the last analyzed study is loaded Depending on the models calculated the different work sheets are enabled or not If any model is found for the study only the Analysis work sheet is present If there is not EEG Quantitative Analysis any active study then the Open Study command should be used for activating one Analysis This work sheet carries out the model s calculation In the group Narrow Band definition the parameters for calculating CROSS and ZCROSS models are set The following table explains the parameters Parameter Meaning Spectral Defines the equivalent parameter to the sampling Resolution period rate in the time domain but for the frequency domain in this case The value given to this parameter has implications about the segment length u
45. y model as another measure allowing the model observation with or without it What Electrical Tomography is 46 Brain Electrical Tomography BET is obtained by integrating functional information given by EEG and the anatomical information provided by anatomical tomographies like Magnetic Resonance Imaging MRD With BET it is possible to localize spatially the sources of several processes physiological and originated by dysfunctions of the Central Nervous system For obtaining the BET it is necessary to solve the EEG inverse problem It means to assess the localization of the sources of electrical activity by using the electrical activity recorded at the scalp By using complex calculation methods it is possible to solve this problem using as input data the recorded electrical activity the channel s coordinates over the scalp as well as the anatomical information provided by anatomical tomography This solution is represented by means of functional images EEG Quantitative Analysis BET calculated with EEG Quantitative Analysis has two main characteristics It is calculated in the frequency domain using as input the information contained in the cross spectral matrices CROSS model It is calculated over an average brain obtained at the Montreal Neurological Institute over a sample of 305 normal MRI brains More details about the methodology can be found in 3D Statistical Parametric Mapping of EEG source spectra by means
46. y if the full 10 20 montage all 19 channels is included in the calculation montage If any channel from 10 20 montage is missing there won t be any calculation Narrow Band 10 20 52 In this work sheet the CROSS ZCROSS ETC ZETC ETCBG and ZETCBG models are visualized To the right of the work sheet the electrical tomography will be plotted by using axial slices The letters R and at the upper border indicate the right and left sides in the slices By using the scroll bar it is possible to make visible the slices not shown at the sheet The tomography is scaled to the best possible fit over the whole spectra using a MaxMin scale type The electrical tomography can be displayed with higher resolution with the BET Viewer system see command View in BET Viewer There are options at the information bar for selecting the state to visualize the transformation raw or Z PG correction as well as the tomography type Depending on the calculated variants for the loaded study these options will have available the different possibilities EEG Quantitative Analysis Narrow Band 10 20 Frequency 7 Mean 8 984 Hz i Std Dev F AVR FZ AVR 0 92 1 80 T3 AVR CZ AVR 0 27 1 63 TS AVR PZ AWR 2 40 i 0 85 58 g 8 C TWDATALALAR__ 0 rl When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those e ements ce Wh
47. y if the loaded study can be compared with the norms The interval represented by the standard deviations is obtained from adding and subtracting 1 96 to the mean spectra corresponding to the age of the study Narrow Band 10 20 Frequency Fpl AMr 3 93 Fpe Aw E Mean 8 594He Han 120 pg std Dev 1 92 GF 8 594 Hz pH F7 AWR F3 AWR FZ AWR F AWR Fe AWR Ddr 0 69 1 24 1 16 1 40 T3 AYE T3 AYE Te AVE T AWF T4 AYE 0 04 0 64 1 00 0 356 0 95 TS AWR P3 AVR PZ AWR P AWR TE AVR 1 63 0 65 0 65 0 56 nai COLAR 4 0 amp 8 OR AVR 2 67 3 05 gt CATWDATAALAR O T When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those elements T When the mouse cursor is over the map the derivation name and its value are Shown at the status bar 12 EEG Quantitative Analysis Broad Band In this work sheet the BBSP and ZBBSP models are visualized From these models are visualized using topographic maps 3 measures Absolute Power Relative Power and Mean Frequency for every band calculated The maps are plotted on screen in matricial way where the rows correspond to the measures and the columns to the bands The first row for every measure shows the raw measure and the second one shows the Z transform There are options at the information bar for selecting the state to visualize as well as PG correction The raw measures are displa
48. yed using a best fit data MaxMin scale and the Zs are displayed with a Threshold scale with 3 0 as threshold value see Scale map command J 1 50 1 53 GF AP Delta pH GP AP Theta peida GP AP Alpha peida GP AP Beta Broad Band 11 67 GP AP Total uve Hz J 3 50 3 50 3 50 3 50 3 50 GF AP Z Delta GP AP Z Theta GP AP 2 Alpha GP AP 2 Beta GP AP 2 Total J 0 82 0 04 0 28 RF Delta RF Theta RF Alpha HP Beta Di q RF z Delta RF Theta RF z Alpha RF z Beta J 10 01 10 87 2 26 9 45 15 30 Ev MF Delta Hz MF Theta MF Alpha Hz MF Beta Hz MF Total Hz 3 50 3 50 3 50 3 50 3 50 3 50 3 50 MF Delta MF Z Theta MF z Alpha MF Beta MF Z Total CATWDATAALAR D 13 EEG Quantitative Analysis If the left button mouse is pressed over the map window the map can be marked unmarked There are several commands for working only over marked maps The marked map is identified by a colored frame surrounding the map window When pressing the right button mouse over the different elements at the work sheet a pop up menu will be displayed with the available commands for those e ements When the mouse cursor is over the map the derivation name and its value are shown at the status bar Broad Band State 14 In this work sheet the BBSP and ZBBSP models can be visualized also but here instead of displaying only the selected state all the calculated states for the loaded study
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