In Code Sequences, Coding Scheme Version is NOT for sending the ContextGroup Version - DICOM

Hi all

In validating some recent images from various sources,
including during the IHE Connectathon, I have observed
a common pattern of errors.

Some people are send a Coding Scheme Version attribute in
with their Code Sequences, and putting the version of
the context group from which the code was selected in
there. This is incorrect.

Indeed Coding Scheme Version should rarely be sent, and
for coding schemes like DCM and SNOEMD (SRT or SNM3) should
never be sent.

E.g., this is wrong:

(0x0008,0x2218) SQ Anatomic Region Sequence
> (0x0008,0x0100) SH Code Value
> (0x0008,0x0102) SH Coding Scheme Designator
> (0x0008,0x0103) SH Coding Scheme Version <20040921>
> (0x0008,0x0104) LO Code Meaning

should be instead either be sent with no version at all:

(0x0008,0x2218) SQ Anatomic Region Sequence
> (0x0008,0x0100) SH Code Value
> (0x0008,0x0102) SH Coding Scheme Designator
> (0x0008,0x0104) LO Code Meaning

or with the context group identified and given a version, e.g.,:

(0x0008,0x2218) SQ Anatomic Region Sequence
> (0x0008,0x0100) SH Code Value
> (0x0008,0x0102) SH Coding Scheme Designator
> (0x0008,0x0104) LO Code Meaning
> (0x0008,0x0105) CS Mapping Resource
> (0x0008,0x0106) DT Context Group Version <20040921>
> (0x0008,0x010f) CS Context Identifier <4209>

Note the absence of Coding Scheme Version in either case.

Also note that you need to send the mapping resource and
the content group version if you send the context identifier.

David