I was able to successfully update the metadata field "AcquisitionDateTime" in my DICOM Image using the DICOMANON function with update and suppling a struct containinng the metadata field name and new value.
However, I am having a problem trying to do the same update with the metadata field "FrameAcquisitionDatetime" in my DICOM image.
I noticed that DICOMDISP will display the FrameAquisitionDatetime metadata field and value (actually several times because I think there are multiple frames in the image) but DICOMINFO does not display the field.
When I issue the DICOMANON function to update this field I do not get an error message. It seems like it works but when I issue the DICOMDISP function on the new dicom file after the update nothing gets updated.
I am able to find the "FrameAcquisitionDatetime" metadata field in the dicom data dictionary file. It is a standard metadata field. Maybe it is in a struct in the metadata and requires specual syntax to update it.