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mbudde
Starting Member
USA
9 Posts |
 Posted - Feb 21 2003 : 11:58:11 AM
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Hello all,
I have a few questions about the run*_Stability.txt files that are produced as part of the functional scan data pipeline to bristol. Could someone tell me how the motion parameters contained in the run*_Stability.txt files are produced, and in what units the data is in? Is this something that is produced by qastats?
My scans are collected axially (64 64 34), so it appears that in the file, the values of x and y are near the center of the volume in units of voxels, since the x & y values are about (32 32) for each slice of each volume, and the values for y are about 1. So, to find the shift in x of the ith volume and the jth slice, would I do:
shiftx= (x(1,j) - x(i,j)) * voxelsize
Am I on the right track here?
Thanks,
matt
_____________________________
Matthew Budde
Associate in Research
Center for Cognitive Neuroscience
Duke University
B203, LSRC
Durham, NC 27708
(919) 668-2299
mbudde@duke.edu |
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jimmy.dias
BIAC Alum
USA
210 Posts |
Posted - Feb 22 2003 : 3:18:30 PM
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hey matt,
These files are generated using Dr. Voyvodic's fScan program. From what I understand (Jim, please correct me if I am wrong), the 2nd and 3rd columns are in pixel units and represent the intensity center of mass in the x and y directions respectively. The last column represents the mean intensity normalized to the first image... And the first column are the slices in xyzt order..
hope that helps!
Jimmy |
Jimmy Dias
Software Engineer
Brain Imaging and Analysis Center
Duke University
Durham, NC 27710 |
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run*_Stability files
