DICOM PS3.3 2019d - Information Object Definitions
C.8.8.25.5 Range Shifter and Lateral Spreading Device Settings

The Range Shifter and Lateral Spreading Device Settings Attributes are used to capture machine specific values related to these devices. For example, some machines may specify the Range Shifter setting as the desired Water-Equivalent Thickness (in mm). Others contain a series of interchangeable plates, whose position in or out of the beam is specified by a series of ones and zeros (i.e., 100010 would specify that plates #1 and #5 are in the beam). If the device does not use a specific setting, but rather is defined by the ID, then the Enumerated Values IN/OUT shall be used for the setting.

DICOM PS3.3 2019d - Information Object Definitions