Материал: part03

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Nominal Device Source Location

RT Beam Limiting

Device Proximal Distance

(300A,0642)

RT Beam Limiting

Device Distal Distance

(300A,0643)

Base Beam Modifier Definition Plane

Figure C.36.2.2.8.1-3. RT Beam Limiting Device Proximal and Distal Distance​

C.36.2.2.9 RT Beam Limiting Device Opening Macro​

This Macro defines the opening created by RT Beam Limiting Devices at a specific Control Point or set of Control Points.​

Table C.36.2.2.9-1. RT Beam Limiting Device Opening Macro Attributes​

See Section C.36.2.2.9.1.1 and Section C.36.2.2.8.1.2.​

Required if the conditions in Section C.36.2.2.5.1.1 are satisfied.​

- Standard -​

See Section C.36.2.2.9.1.1 and Section C.36.2.2.9.1.3.​

Only a single Item shall be included in this Sequence.​

>>Include Table 10.38-1 “Outline Definition Macro​ The Outline Shape Type (0018,1630) shall be CIRCULAR.​

Attributes”.​

The plane is defined in Section C.36.2.2.9.1.1.​

C.36.2.2.9.1 RT Beam Limiting Device Opening Attribute Descriptions​

C.36.2.2.9.1.1 Geometric Value Attributes​

All geometric values in Table C.36.2.2.9-1 are defined in the Beam Modifier Definition Plane.​

C.36.2.2.9.1.2 RT Beam Delimiter Element Positions​

For Device Type Code Sequence (3010,002E) values of (130330, DCM, "Jaw Pair") or (130331, DCM, "Leaf Pairs"), the order of​ values are​

N1, N2, Nn​

P1, P2, Pn​

where N denotes the negative mounting side, P the positive mounting side and the indices increasing corresponding to the order of​ the values of Parallel RT Beam Delimiter Boundaries (300A,0649).​

C.36.2.2.9.1.3 RT Beam Delimiter Geometry​

The definition of the tip positions in Parallel RT Beam Delimiter Positions (300A,064A) or delimiter outline in the RT Beam Delimiter​ Geometry Sequence (300A,064C) is as defined by the manufacturer and shall be documented in the Conformance Statement. Typ-​ ically, this will be the radiological or physical edge.​

- Standard -​

C.36.2.2.10 Wedges Definition Macro​

This Macro defines the geometric configuration elements which cannot vary during delivery.​

Table C.36.2.2.10-1. Wedges Definition Macro Attributes​

The direction from thick edge to thin edge is along the positive y-axis​ of the Beam Modifier Definition Plane.​

See Section C.36.1.1.9 and Section C.36.2.2.10.1.1.​

C.36.2.2.10.1 Wedges Definition Macro Attribute Description​

C.36.2.2.10.1.1 Radiation Beam Wedge Orientation and Radiation Beam Wedge Angle​

For an Equipment Frame of Reference UID 1.2.840.10008.1.4.3.1 the wedge orientation has the value of 0 degree when the thin​ edge of the wedge is directed towards the positive direction of the y-axis of the Beam Modifier Coordinate system.​

- Standard -​

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Radiation source

Beam Modifier Orientation Angle (300A,0645) value = 0º

Plane

Figure C.36.2.2.10.1-1. Beam Modifier Orientation Angle​

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Radiation Source

Wedge

Isodose Line measured in water (e.g., at 50%)

Radiation Beam Wedge Angle

(300A,0652)

Beam Central Axis

Figure C.36.2.2.10.1-2. Radiation Beam Wedge Angle​

C.36.2.2.11 Wedge Positions Macro​

This Macro defines the positions of Wedges used in a specific Control Point or set of Control Points.​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​ Page 1615​

Table C.36.2.2.11-1. Wedge Positions Macro Attributes​

The value is negative if the thin edge is located on the positive y-axis, and​ is positive otherwise.​

Required if Wedge Position (300A,0118) is PARTIAL.​

See Section C.36.2.2.11.1.1.​

- Standard -​