DICOM PS3.17 2019b - Explanatory Information

MM.3 Frame Numbers

Frame numbers are indexes, not identifiers for frames. In every object, the frame numbers always start at 1 and increment by 1, and therefore they will not be the same after extraction into a new SOP Instance.

A SOP Instance may contain internal references to its own frames such as mask frames. These may need to be corrected.

DICOM PS3.17 2019b - Explanatory Information