CAMRI:HowToScan: Difference between revisions
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The BCM CAMRI has 3 whole-body 3T Siemens Magnetom Trios, labelled 3T-3, 3T-4 and 3T-5. | The BCM CAMRI has 3 whole-body 3T Siemens Magnetom Trios, labelled 3T-3, 3T-4 and 3T-5. | ||
3T-3 and 3T-4 currently have 8 receive channels, 3T-5 has 32 channels. | 3T-3 and 3T-4 currently have 8 receive channels, 3T-5 has 32 channels. | ||
On January 11, 3T-4 will be upgraded to a Prisma Fit system and will be out of commission for most of January and February. | |||
First, register the patient. | First, register the patient. | ||
A shortcut is to bring up a previously registered patient, and then edit that record. | A shortcut is to bring up a previously registered patient, and then edit that record. |
Revision as of 09:56, 30 November 2015
SchedulingTo schedule or cancel time on the scanner, you must use use the iLab web site https://bcm.corefacilities.org/service_center/show_external/3684 Click here for detailed instructions. About CAMRI's Siemens ScannersThe BCM CAMRI has 3 whole-body 3T Siemens Magnetom Trios, labelled 3T-3, 3T-4 and 3T-5. 3T-3 and 3T-4 currently have 8 receive channels, 3T-5 has 32 channels. On January 11, 3T-4 will be upgraded to a Prisma Fit system and will be out of commission for most of January and February. First, register the patient. A shortcut is to bring up a previously registered patient, and then edit that record. TroubleshootingReport all issues to camri@bcm.edu http://openwetware.org/images/0/01/CAMRI_MRI_Safety_Manual.pdf
The sequence of operation is important so make sure it is done in this order. Response RecordingResponses are recorded with a fORP system. Link to Jung Hwan's user guide here: fORP Configuration Visual Stimulus Displays3T-3 and 3T-5 display visual stimuli on direct view LCD screens.
3T-3 uses a [24" display with resolution of 1920x1200] Link to manual here: Cambridge Research Systems BOLD Screen User Guide 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. Rough calculation of image size in degrees of visual angle: roughly 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 Misc NotesSlice OrderingDavid 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.
What pulse sequence to use for fMRIThere are a variety of different pulse sequences that can be used for fMRI, including the standard Siemens EPI product sequences; multi-band EPI sequences from MGH and Univ. of Minnesota; and spiral sequences implemented by David Ress.
Here is another analysis of the same data by David Ress. The results are similar, with the G2, MB2 version winning by around 15% in fSNR over the product sequence. But, the shorter TR will also net you an improvement of ~5% in CNR in a similar length run. It is also interesting, however, that the G3 run had less aliasing artifact, suggesting that shorter acquisition times reconstruct more cleanly. Similar results were obtained with a phantom: |