 |
 |
Dear Mark, The easiest way is to use spm_read_vols (I love that routine). It determines the size of the image by itself so you don't have to provide a sampling grid. If you use d=spm_read_vols(V(i)) you can extract the voxels you need from the 3D array d. If you do d4=spm_read_vols(V) you get a 4D array with all the images (the 4th dimension being the image index). Regards, Alle Meije Wink On Tue, 2005-01-04 at 10:24 +0000, Mark Daglish wrote: > Dear Experts, > > I am trying to update a program which used to use spm_sample_vol from > SPM96 to use the SPM2 equivalent routine. I am getting the error "Bad > Image Dimensions" from spm_sample_vol and can't see where I'm going > wrong. The following will illustrate what I am doing: > > I='dynamic PET image name'; > for i=1:num_frames > P(i)=strcat(I,',',num2str(i)); > end; > V=spm_vol(P); > % therefore V = 18x1 struct array created with spm_vol from an 18 frame > dynamic PET image > X=ones(1:V(1).dim(2)); > Y=1:V(1).dim(2); > Z=X; > d=spm_sample_vol(V(1),X,Y,Z,0); > > Can anyone else spot the obvious mistake? > > Many thanks for any help. > > Mark > > -- > =============================== > Dr. Mark Daglish > Clinical Lecturer in Psychiatry > Psychopharmacology Unit > University of Bristol > UK > ===============================