You could use the IO part of the following commits as a template:
rMITKa16db1ae35c7: Create cest module with reading capabilities
and
rMITK52d41df26af0: First register mime type, then reader. Gets rid of warning

This creates a new dicom reader for CEST data, which is only a selectable option if the DICOM metadata suggests it is a diffusion image. If that is indeed the case it has a higher priority than the default dicom readers (and will thus be the default option).

Pushed new branch T23329-DiffusionDicomAutoload.

Your new reader service has a couple of "recoursive" where it should read "recursive"