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@Kay_Park: Can anybody tell me which attribute of the CT image DICOM file determine the order of the CT images in the viewport? I entered image positions in order, but the viewport just mixes them up in random order
@Bill_Wallace: That depends on the viewport setup - there are lots of possible options. By default, in OHIF for a stack viewport, it should sort the images by increasing instance number, then by increasing instance date/time, and finally by increasing SOP Instance UID, but it may just display them in the order they are returned from the data source.