Not persuasive . First off, to capture the correct data type for this suggestion is Period. However, this is a direct mapping from the DICOM attribute. Since another image, GSPS or SR can always be added to a study, the notion of when was the study is complete is hard to define. Would we use the last capture time of the initial capture, or the most recent added instance. (This could easily imply that a study goes on for weeks or months.) The correct place to capture this information is in the procedure.