DICOM PS3.3 2019c - Information Object Definitions
C.8.8.15.9 Control Point Relative Position

Control Point Relative Position (300A,02D2) shall describe where the center of a given source in a channel is located with respect to the end of the channel, i.e. to the center of the distal-most possible dwell position in the channel.

DICOM PS3.3 2019c - Information Object Definitions