NEMA has released a 16 part 2006 update for DICOM (your's for only $999.00).

"The 2006 DICOM standard introduced many new features that are relevant
to users. For example, dose reporting for radiation exposure will
improve the documentation and quality of procedures," said Peter
Mildenberger, professor of radiology, University Hospital Mainz in
German, and DICOM user co-chair. "The CT/MR cardiovascular analysis
report will improve the workflow in computer-based evaluation, as well
as communication of the results. New compression algorithms will help
speed up PACS solutions and teleradiology. As DICOM becomes the imaging
standard in medicine, more and more clinical disciplines, hospitals,
and government institutions are committed to this standard," he added.

You can find an online version here.