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14:52:16 <dbooth> Meeting: FHIR RDF
14:52:19 <dbooth> Chair: David Booth
15:02:51 <dbooth> Topic: DICOM
15:03:11 <dbooth> erich: I've updated my code to convert values to meters.  Need to test it.
15:03:47 <dbooth> ... i'm only converting the polygon data.
15:04:16 <dbooth> ... Maybe should use complex datatypes that Olaf proposed.
15:05:27 <dbooth> ... We might have a complete conversion to RDF for all of the metadata, but not the data itself, like images.
15:05:46 <dbooth> ... The polygons make sense to convert, to use geosparql.
15:07:40 <dbooth> https://olafhartig.de/files/HartigEtAl_SPARQLCDTs_PosterPaper2024.pdf
15:08:17 <dbooth> Topic: HAPI FHIR
15:08:42 <dbooth> jim: EricP and I will meet to discuss
15:09:29 <dbooth> Topic: DICOM
15:09:54 <dbooth> detlef: If we don't know what an array is, then wonder what to do with it.
15:10:26 <dbooth> ... The proposed complex data type puts the data into a list.   There's also a proposal to add sparql operators to work on them.
15:11:54 <dbooth> ... Is there a way to detect these arrays of data?
15:12:28 <dbooth> detlef: Everytime the data value multiplicity is > 1, then it's an array.
15:13:18 <dbooth> erich: I'll take a look at it, and try it.
15:13:32 <dbooth> ... As a command-line option
15:14:27 <dbooth> ... When we discuss with the DICOM group, the options will be discussion points with them.
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15:24:43 <dbooth> rrsagent, draft minutes
15:24:44 <RRSAgent> I have made the request to generate https://www.w3.org/2025/04/10-hcls-minutes.html dbooth
15:27:10 <dbooth> Topic: DICOM issue Using the entity-relationship model of the real world of DICOM #159
15:27:17 <dbooth> https://github.com/w3c/hcls-fhir-rdf/issues/159
15:29:50 <dbooth> detlef: If there is a link, it should be to the whole object, not the part.
15:30:17 <dbooth> erich: Could we use this to factor out data that is common to all?  detlef: Yes
15:30:30 <dbooth> ... E.g., study
15:32:02 <dbooth> detlef: Everyone knows which attributes belong to the series.
15:32:30 <dbooth> ... Want the triplestore to auto-merge the items in the series -- factoring out the redundant info.
15:32:37 <dbooth> ... That makes querying much faster.
15:34:07 <dbooth> erich: I need to look at this.  We have > 25M files.  Some files have illegal xsd datetypes.  When the data is generated (>5B triples), having the redundant data won't be efficient.  What you're proposing is the way to go.
15:34:17 <dbooth> detlef: That's what we've done.
15:34:36 <dbooth> erich: I wasn't aware of the DICOM DIR files previously.
15:34:51 <dbooth> ... But I don't yet apply the transforms that you're proposing.
15:35:49 <dbooth> detlef: The SOP instance UID is the UID of a very large object.
15:36:07 <dbooth> .. We have a series resource, and say that it contains some other resource.
15:37:40 <dbooth> ACTION: Detlef to add an example to the github issue
15:38:13 <dbooth> erich: Things like age need to stay with the SOP instance.
15:38:46 <dbooth> detlef: Patient age belongs to a study, not to the patient.
15:39:57 <dbooth> ... But you need to know which attributes belong to study, etc.  They have normative XML files that define the DICOM schema
15:41:11 <dbooth> detlef: The OWL representation that we generate from the normative XML files are pretty much 1:1.
15:41:40 <dbooth> ... Wonder if a SHACL representation might be more suitable.
15:41:51 <dbooth> erich: I'm defining them as their own shapes.
15:42:49 <dbooth> Present: Detlef Grittner, Erich Bremer, David Booth, Jim Balhoff
15:42:57 <dbooth> (Jim departs)
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15:48:45 <dbooth> ADJOURNED
15:48:51 <dbooth> rrsagent, draft minutes
15:48:52 <RRSAgent> I have made the request to generate https://www.w3.org/2025/04/10-hcls-minutes.html dbooth