I just wanted to give people some warning about unpacking/converting
anonymized Siemens dicom files. Siemens inserts some ascii information
into their dicom files (what I call the "ascii header"). This is
inserted into a "private" field in the dicom header. Some anonymizers
will strip this information out of the dicom file.
If the dicom file contains a mosiac (eg, as with functionals), then it
will not be possible to unpack it using the tools in freesurfer if the
ascii header is gone.
If the dicom file contains individual slice images (non-mosaics), then
it is possible to unpack it correctly even if their is no ascii header.
There is currently a bug in mri_convert/unpacksdcmdir that might cause a
slice reversal if the ascii header is not there. If you acquired data
sagitally, this would mean a left-right flip.
This bug has been fixed (live in dev and stable tomorrow). Even so, be
very careful when anonymizing your data. You should do some sort of
check against unanonymized data to assure that nothing funny has happened.
doug
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
[EMAIL PROTECTED]
Phone Number: 617-724-2358
Fax: 617-726-7422
In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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