If you haven't to see series exams (aka MR, CT) display from ImageMagick works fine (it also works for serie files, but manipulating DICOM tags is not its best feature; cross-referencing could be a must even for radiologists w/ lot experience, hence aeskulap).
GIMP can aquire and export DICOM format files.
dcmtk contais conversion binaries (DICOM to much more than I've needed). ctn is server oriented, but it is based on dcmtk, and pays back in turn imagectn database to dcmtk. If you're interested you should try Pablo Sau (somewhere on
) work, who made up an live Koppix based CD (a RIS, in fact).
I am not a programmer, neither I have too much time to spent on Internet, but medical debian seems to be rather obsolete.