C.8.8.14.17 Enhanced RT Beam Limiting Device Sequence and Enhanced RT Beam Limiting Opening Sequence

C.8.8.14.17 Enhanced RT Beam Limiting Device Sequence and Enhanced RT Beam Limiting Opening Sequence (Current)
Prev	C.8.8.14 RT Beams Module	Next

When the value of Enhanced RT Beam Limiting Device Definition Flag (3008,00A3) has the value YES, the following applies to the content of Enhanced RT Beam Limiting Device Sequence (3008,00A1) and Enhanced RT Beam Limiting Opening Sequence (3008,00A2):

For the Beam Modifier Definition Coordinate System used the following applies:
- The Base Beam Modifier Definition Coordinate System is the [IEC 61217] GANTRY coordinate system.
- The RT Device Distance Reference Location is (130358, DCM, "Nominal Radiation Source Location").
- The value of the RT Beam Modifier Definition Distance (300A,0688) equals the value of Source-Axis Distance (300A,00B4).
- The value of the Beam Modifier Orientation Angle (300A,0645) is 0 for IEC X direction and 90 for IEC Y direction.
Note

The values of boundaries and openings are therefore the same as if comparable parameters would be expressed in the Beam Limiting Device Sequence (300A,00B6).

Values of Attributes of the Module RT Tolerance Tables C.8.8.11 apply to the Enhanced RT Beam Limiting Device Openings as follows:

Tolerance Module C.8.8.11	RT Beam Limiting Device Type (300A,00B8)	Enhanced RT Beam Limiting Opening Sequence (3008,00A2)	Device Type Code Sequence (3010,002E) and Beam Modifier Orientation Angle (300A,0645)
Beam Limiting Device Position Tolerance (300A,004A)	X, ASYMX	Parallel RT Beam Delimiter Positions (300A,064A)	(130330, DCM, "Jaw Pair") Beam Modifier Orientation Angle (300A,0645) = 0
Beam Limiting Device Position Tolerance (300A,004A)	Y, ASYMY	Parallel RT Beam Delimiter Positions (300A,064A)	(130330, DCM, "Jaw Pair") Beam Modifier Orientation Angle (300A,0645) = 90
Beam Limiting Device Position Tolerance (300A,004A)	MLCX	RT Beam Limiting Device Offset (300A,064B)	(130331, DCM, "Leaf Pair") or (130333, DCM, "Single Leaves") Beam Modifier Orientation Angle (300A,0645) = 0
Beam Limiting Device Position Tolerance (300A,004A)	MLCY	RT Beam Limiting Device Offset (300A,064B)	(130331, DCM, "Leaf Pair") or (130333, DCM, "Single Leaves") Beam Modifier Orientation Angle (300A,0645) = 90

Prev	Up	Next
C.8.8.14.16 Referenced Control Point	Home	C.8.8.14.18 Presence of Items within Sequences in the Control Point Sequence

C.8.8.14.17 Enhanced RT Beam Limiting Device Sequence and Enhanced RT Beam Limiting Opening Sequence

Note