Beauchamp:HowToScan: Difference between revisions
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# click on "Displays", select the "Color" Tab | # click on "Displays", select the "Color" Tab | ||
# Select the "Color LCD" profile for the second display (the BOLDscreen) | # Select the "Color LCD" profile for the second display (the BOLDscreen) | ||
Ricky Savjani has redone the gamma calibration on the 3T-5 BOLDscreen, this can be accessed in PsychToolbox as follows | Ricky Savjani has redone the gamma calibration on the 3T-5 BOLDscreen, this can be accessed in PsychToolbox as follows. First, [[Media:gammaTable_Spline_fit.mat|Click here to load the table]] | ||
[[Media:gammaTable_Spline_fit.mat|Click here to load the table]] | |||
% load in the gamma table | % load in the gamma table | ||
load CRS_32BOLDSCREEN/gammaTable_Spline_fit.mat | load CRS_32BOLDSCREEN/gammaTable_Spline_fit.mat |
Revision as of 13:15, 22 July 2015
How to Scannext step is Getting raw data from the scanner About the BCM CAMRI Siemens ScannersThe BCM CAMRI has 3 whole-body 3T Siemens Magnetom Trios. We usually scan on 3T-5 with the 32-channel head coil. David Ress' former student Andrew Florens examined the acquisition time stamps and found that axial slices are collected from Superior to Inferior (head to foot). If an odd number of slices is acquired, the slice order is 1, 3, 5, 7, etc. 2, 4, 6, 8 etc. If an even number of slices is acquired, the slice order is reversed: 2, 4, 6, 8, etc. 1, 3, 5, 7, etc. See Krista to have your badge activated. More details on the BCM scanners
The BOLDScreen has a built-in color profile that can make images appear too dark. Instead, use the default color profile as follows:
Ricky Savjani has redone the gamma calibration on the 3T-5 BOLDscreen, this can be accessed in PsychToolbox as follows. First, Click here to load the table % load in the gamma table load CRS_32BOLDSCREEN/gammaTable_Spline_fit.mat % after opening a window, call this to load the load the gamma table to to your Screen Screen('LoadNormalizedGammaTable', win, gammaTable2*[1 1 1]); Now, desired intensity levels will be mapped appropriately to the screen. Responses are recorded with a fORP system. Link to Jung Hwan's user guide here: fORP Configuration For Beauchamp Lab experiments, do the following:
This gives a trigger as a T rather than a 5. An extra step needs to be taken to make sure that the right USB device is selected in Matlab (from the three possibilities). To access pulse sequences, Click on Ctrl-Esc and select the "Advanced User" program. Type in the password (meduser1). Then go back, and open a Windows Explorer window. The pulse sequences are located under C:/medcom/mricustomer/seq The diffusion vectors are stored in the file DiffusionVectors.txt If the real-time is not working, make sure you are using the correct pulse sequence (VB17rt EPI). Also check the tabs computer (MacPro):
$ su admin_local
$ kill -9 'cat /Uses/tabs/tabs/var/afni.pid'
Type logviewer from the command prompt. Image information in Trios: 76.5 cm from screen to eyeball height of screen is 13.7 in = 34. 8 cm width of screen is 34.8 * (1024/768) = 46.4 cm atan(23.2/76.5) = 0.29 rad = 16.6 degrees ~30 degrees full width
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