DICOM PS3.3 2019d - Information Object Definitions
C.8.8.14.8 Machine Rotations

For the machine rotation angles Gantry Angle (300A,011E), Beam Limiting Device Angle (300A,0120), Patient Support Angle (300A,0122), and Table Top Eccentric Angle (300A,0125), rotation direction is specified as clockwise (CW), counter-clockwise (CC), or NONE. The maximum permitted rotation between two Control Points is 360 degrees. Examples:

  1. Gantry Angle moves from 5 degrees to 5 degrees, Gantry Rotation Direction = NONE:

    No movement.

  2. Gantry Angle moves from 5 degrees to 5 degrees, Gantry Rotation Direction = CW:

    Full clockwise rotation (360 degrees).

  3. Table Angle moves from 170 degrees to 160 degrees, Table Rotation Direction = CC:

    Counter-clockwise rotation by 350 degrees (note direction of increasing table angle as defined by IEC 61217).

DICOM PS3.3 2019d - Information Object Definitions