For everything from thousands of single-slice DICOM to
4D images like Philips's PAR/REC which is sort-of
DICOM, I use the dcm2nii command that comes with
MriCRoN (http://www.sph.sc.edu/comd/rorden/mricron).
As for the "argument list too long" problem, when I
have a directory full of 2D dicom files that together
constitute a 4D data set, calling "dcm2nii <first 2D
file>" automatically packs the data together in 1
file.
Has never failed so far. It sets the q-form (which for
fMRI is not really useful but it's easy to set to 0)
and other NifTI fields. The slice_order field must be
set manually (for programs that can use it).
hth
Alle Meije
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