DICOM PS3.3 2016b - Information Object Definitions

C.31.2 RT Conventional Machine Verification Module
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### C.31.2 RT Conventional Machine Verification Module

Table C.31-2 specifies the attributes used to convey the parameters used in external verification of a conventional radiotherapy (photon or electron) treatment delivery.

Table C.31-2. RT Conventional Machine Verification Module Attributes

Attribute Name | Tag | Description
--- | --- | ---
Conventional Machine Verification Sequence | (0074,1044) | Sequence containing conventional machine verification parameters. Zero or one Item shall be included in this Sequence.
>Conventional Control Point Verification Sequence | (0074,104C) | Beam control points for current treatment beam. Only a single Item shall be included in this Sequence.
>>Nominal Beam Energy | (300A,0114) | Nominal Beam Energy at control point.
>>Dose Rate Set | (300A,0115) | Dose Rate to be set on treatment machine for segment beginning at current control point (e.g., MU/min).
>>Wedge Position Sequence | (300A,0116) | Wedge Positions for the current control point. One or more Items shall be included in this Sequence. See Section C.8.8.14.5.
>>>Wedge Position | (300A,0118) | Position of Wedge at current Control Point. Enumerated Values: IN OUT
>>>Referenced Wedge Number | (300C,00C0) | Uniquely references Wedge described by Wedge Number (300A,00D2) in Wedge Sequence (300A,00D1).
>>Beam Limiting Device Position Sequence | (300A,011A) | Beam limiting device (collimator) jaw or leaf (element) positions. One or more Items shall be included in this Sequence.
>>>RT Beam Limiting Device Type | (300A,00B8) | Type of beam limiting device (collimator). The value of this attribute shall correspond to RT Beam Limiting Device Type (300A,00B8) defined in an item of Beam Limiting Device Sequence (300A,00B6) Enumerated Values: X symmetric jaw pair in IEC X direction Y symmetric jaw pair in IEC Y direction ASYMX asymmetric jaw pair in IEC X direction ASYMY asymmetric pair in IEC Y direction MLCX multileaf (multi-element) jaw pair in IEC X direction MLCY multileaf (multi-element) jaw pair in IEC Y direction
>>>Leaf/Jaw Positions | (300A,011C) | Positions of beam limiting device (collimator) leaf (element) or jaw pairs in mm in the IEC BEAM LIMITING DEVICE coordinate axis appropriate to RT Beam Limiting Device Type (300A,00B8), e.g., X-axis for MLCX, Y-axis for MLCY. Contains 2N values, where N is the Number of Leaf/Jaw Pairs (300A,00BC) in Beam Limiting Device Sequence (300A,00B6). Values shall be listed in the IEC leaf (element) subscript order 101, 102, … 1N, 201, 202, … 2N.
>>Gantry Angle | (300A,011E) | Gantry angle in degrees of radiation source, i.e., orientation of the IEC GANTRY coordinate system with respect to the IEC FIXED REFERENCE coordinate system.
>>Gantry Rotation Direction | (300A,011F) | Direction of Gantry Rotation when viewing gantry from isocenter, for segment following Control Point. See Section C.8.8.14.8. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Beam Limiting Device Angle | (300A,0120) | Beam Limiting Device angle in degrees, i.e., orientation of the IEC BEAM LIMITING DEVICE coordinate system with respect to the IEC GANTRY coordinate system.
>>Beam Limiting Device Rotation Direction | (300A,0121) | Direction of Beam Limiting Device Rotation when viewing beam limiting device (collimator) from radiation source, for segment following Control Point. See Section C.8.8.14.8. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Patient Support Angle | (300A,0122) | Patient Support angle in degrees, i.e., orientation of the IEC PATIENT SUPPORT (turntable) coordinate system with respect to the IEC FIXED REFERENCE coordinate system.
>>Patient Support Rotation Direction | (300A,0123) | Direction of Patient Support Rotation when viewing table from above, for segment following Control Point. See Section C.8.8.14.8. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Table Top Eccentric Axis Distance | (300A,0124) | Distance (positive) in mm from the IEC PATIENT SUPPORT vertical axis to the IEC TABLE TOP ECCENTRIC vertical axis.
>>Table Top Eccentric Angle | (300A,0125) | Table Top (non-isocentric) angle, i.e., orientation of the IEC TABLE TOP ECCENTRIC coordinate system with respect to the IEC PATIENT SUPPORT coordinate system, in degrees.
>>Table Top Eccentric Rotation Direction | (300A,0126) | Direction of Table Top Eccentric Rotation when viewing table from above, for segment following Control Point. See Section C.8.8.14.8. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Table Top Vertical Position | (300A,0128) | Table Top Vertical position in mm in the IEC TABLE TOP coordinate system. See Section C.8.8.14.6.
>>Table Top Longitudinal Position | (300A,0129) | Table Top Longitudinal position in mm in the IEC TABLE TOP coordinate system. See Section C.8.8.14.6.
>>Table Top Lateral Position | (300A,012A) | Table Top Lateral position in mm in the IEC TABLE TOP coordinate system. See Section C.8.8.14.6.
>>Table Top Pitch Angle | (300A,0140) | Table Top Pitch Angle in degrees, i.e., the rotation of the IEC TABLE TOP coordinate system about the X-axis of the IEC TABLE TOP coordinate system. See Section C.8.8.25.6.2.
>>Table Top Pitch Rotation Direction | (300A,0142) | Direction of Table Top Pitch Rotation when viewing the table along the positive X-axis of the IEC TABLE TOP coordinate system, for segment following Control Point. See Section C.8.8.14.8 and Section C.8.8.25.6.2. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Table Top Roll Angle | (300A,0144) | Table Top Roll Angle in degrees, i.e., the rotation of the IEC TABLE TOP coordinate system about the Y-axis of the IEC TABLE TOP coordinate system. See Section C.8.8.25.6.2.
>>Table Top Roll Rotation Direction | (300A,0146) | Direction of Table Top Roll Rotation when viewing the table along the positive Y-axis of the IEC TABLE TOP coordinate system, for segment following Control Point. See Section C.8.8.14.8 and Section C.8.8.25.6.2. Enumerated Values: CW clockwise CC counter-clockwise NONE no rotation
>>Referenced Control Point Index | (300C,00F0) | Uniquely identifies Control Point specified by Control Point Index (300A,0112) within the Beam referenced by Referenced Beam Number (300C,0006).

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DICOM PS3.3 2016b - Information Object Definitions