Either: a) An integer referencing the image by its position in the collection, starting at 1. or b) A String referencing the Instance UID of the Image/DataSet.
Either: a) An integer referencing the image by its position in the collection, starting at 1. or b) A String referencing the Instance UID of the Image/DataSet.
Remarks
The index is a variant as images or datasets may be referred to either by numerical sequence (as used for CurrentIndex), but also by their unique instance UID. An exception is generated if either a numerical argument is out of bounds, or if reference is made to a non-existent instance UID.