No, you will need to decide how big you want your voxels to be. If you
use --volres 1 1 1 1 then that should work. It will put the center of
the volume at that coordiate. If you want a single voxel, then use --dim
1 1 1 1 and --volres 6.25 6.25 7.5 1
On 8/31/15 7:52 PM, John Anderson wrote:
Thank you for the quick response.
I wanted to create volume has the following dimentions in mm ( 6.25 X
6.25 X 7.5) in a position where the coordinates (in mm) are X=-15 Y=
-4 Z= 13
is this command line correct:
mri_volsynth --dim 6.25 6.25 7.5 1 --c_ras -15 -4.3 13 --o voxel.nii
Bests,
John Anderson
Senior Research Associate
Psychological and Brain Sciences Dept.
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834
Fax: +1 (603) 646-1419
*Sent:* Monday, August 31, 2015 at 11:30 AM
*From:* "Douglas Greve" <gr...@nmr.mgh.harvard.edu>
*To:* freesurfer@nmr.mgh.harvard.edu
*Subject:* Re: [Freesurfer] mri_volsynth
some of this is answered if you run the command with --help
On 8/31/15 3:33 PM, John Anderson wrote:
Hi Freesurfers,
I want to create volume 6.25 X 6.25 X 7.5 in this position in
scanner space ( x=48, y= 48, z=10)
I used the following command line to create the volume but I don't
know how to choose it is position in scanner space.
mri_volsynth --dim 6.25 6.25 7.5 0 --o voxel.nii
I have the following question because i didn't find enough
information in FS wiki about this command:
1. If the flag --dim (nc nr ns nf) is reffering to the volume
dimentions. What is the fourth number (nf ) is standing for ?
Number of frames (the time dimension)
2. what is the meaning of voxel resolution ( the flag --res (dc dr
ds df) ) and what is the meaning of the numbers dc dr ds df ?
How big the voxel is in mm
3. Is the flag c_ras ( c_r c_a c_s) reffering to the volume
position. If yes is it in mm or in voxels?
The "center" of the volume in mm, where "center" is defined as
(Nvoxels-1)/2 where Nvoxels is the number rows, cols, or slices.
Thanks in advance ,
John
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The information in this e-mail is intended only for the person to whom it is
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contains patient information, please contact the Partners Compliance HelpLine at
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