DICOM: What's the point of SOPInstanceUID tag?

Question

DICOM already provides a unique enough identifier for the Series (e.g. Series Instance UID), so why also include one on the lower level objects (e.g. SOPInstanceUID)?

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Answer 1

SOPInstanceUID represent separate uid of the Dicom Image File. Study, series and sopinstace uids are based on data model. StudyUID give you the particular study information. In which different series devided. Series instance uid used for for this. And SOP instance uid represent seperate Dicom image. It's hierarchy structure. I also never used SOPInstanceUID when i developed PACS workstation in Java. As per my experience, Study & Series uids are enough for represent patient's data. But still SOPInstanceUID gives unique identity to dicom image.