Regarding the libdcmtk-dev as in current SVN: The Provides: libdcmtk-dev is useless (it's already the package name), instead you should have Provides: libdcmtk2-dev for a smoother transition (i.e. do not require sourceful uploads of all reverse build-depends right now). Can be removed once all rdepends are updated to use the unversioned name.
Also you need Conflicts+Replaces: libdcmtk4-dev for a clean upgrade path w.r.t. the package in sid but you probably shouldn't provide libdcmtk4-dev (assuming that this is not used as a Build-Depends, yet). according to the cruft report, these are your reverse b-d: - broken Build-Depends: aeskulap: libdcmtk2-dev amide: libdcmtk2-dev ants: libdcmtk2-dev dcmtkpp: libdcmtk2-dev dicomscope: libdcmtk2-dev elastix: libdcmtk2-dev ginkgocadx: libdcmtk2-dev insighttoolkit4: libdcmtk2-dev itksnap: libdcmtk2-dev mia: libdcmtk2-dev orthanc: libdcmtk2-dev plastimatch: libdcmtk2-dev vxl: libdcmtk2-dev Andreas