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While #1547 solves the usage of unkwown and none -- it remains that the values that can be used are underspecified.
There is only (fortunately) is a limited set of things one is allowed to inject people and this list is available here https://dicom.nema.org/medical/dicom/current/output/chtml/part16/sect_CID_12.html#sect_CID_12.
also means that some values are wrong, reading https://bids-specification.readthedocs.io/en/stable/glossary.html#contrastbolusingredient-metadata
barium --> Barium Sulfate,
iodine -- well there are many variations just iodine does not look correct,
xenon does not look supported ? where is this coming from
Cyril