Материал: part03

associatedwiththepatientanatomymodel.Fordosimetricpurposes​ this value may differ from the Source to Patient Surface Distance​ (300A,0634).​

See Section C.36.11.1.4.​

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

C.36.15.1 C-Arm Photon-Electron Beam Attribute Description​

C.36.15.1.1 Source Roll Angle​

For an Equipment Frame of Reference UID (300A,0675) of 1.2.840.10008.1.4.3.1 (IEC 61217 Fixed Coordinate System Frame of​ Reference), the source roll angle is the rotation of the [IEC 61217] GANTRY coordinate system about the Y-axis of the [IEC 61217]​ FIXED coordinate system.​

C.36.15.1.2 RT Beam Limiting Device Angle​

For an Equipment Frame of Reference UID (300A,0675) of 1.2.840.10008.1.4.3.1 (IEC 61217 Fixed Coordinate System Frame of​ Reference), the RT Beam Limiting Device Angle (300A,0679) is the rotation of the Base Beam Modifier Coordinate System about the​ Z-axis of the [IEC 61217] GANTRY coordinate system.​

C.36.16 Tomotherapeutic Delivery Device Module​

The Tomotherapeutic Delivery Device Module contains tomotherapy-specific information pertaining to the physical device. These​ parameters are used to specify or record the treatment, including geometrical parameters of the collimation system.​

Table C.36.16-1. Tomotherapeutic Delivery Device Module Attributes​

- Standard -​

C.36.17 Tomotherapeutic Beam Module​

The Tomotherapeutic Beam Module specifies or records how a tomotherapeutic treatment is to be or was delivered.​

Table C.36.17-1. Tomotherapeutic Beam Module Attributes​

See Section C.36.15.1.1 and Section C.36.12.1.1.​

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

- Standard -​

The number of leaves (N) is equal to Number of Parallel RT Beam​

Delimiters (300A,0648).​

TheNvaluesshallbeprovidedintheorderofParallelRTBeamDelimiter​

Boundaries (300A,0649).​

Required if RT Record Flag (300A,0639) equals NO and at least one​ leafopentimeisnotsymmetricalaboutthemid-pointoftheControlPoint​ interval and the conditions in Section C.36.2.2.5.1.1 are satisfied.​

C.36.17.1 Tomotherapeutic Leaf Closed and Open Durations​

Typically, the Tomotherapeutic Leaf Open Durations (3010,0099) are symmetric about the mid-point of the Control Point interval. If​ they are not, Tomotherapeutic Leaf Initial Closed Durations (3010,009A) is present, which specifies the duration of time that each​ leaf is closed starting from this Control Point. Tomotherapeutic Leaf Open Durations (3010,0099) then specifies the duration of time​ that each leaf is open after Tomotherapeutic Leaf Initial Closed Durations (3010,009A).​

Foreachleaf,thesumoftheTomotherapeuticLeafInitialClosedDurations(3010,009A)andtheTomotherapeuticLeafOpenDurations​ (3010,0099) shall not exceed the Control Point interval.​

Figure C.36.17-1. Diagram of Tomotherapeutic Leaf Open and Closed Durations​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​ Page 1659​

Table C.36.17-2. Tomotherapeutic Leaf Open and Closed Durations​

In Figure C.36.17-1, the grey sections indicate when the leaves are open during radiation delivery. Table C.36.17-2 illustrates the​ use of Tomotherapeutic Leaf Open Durations (3010,0099) and Tomotherapeutic Leaf Initial Closed Durations (3010,009A) based on​ the diagram. In the Control Point interval between Control Point 1 and 2, the leaf openings are not symmetric within the Control Point​ interval, so Tomotherapeutic Leaf Initial Closed Durations (3010,009A) is provided.​

In the Control Point interval between Control Point 2 and 3, all leaf opening durations are symmetric about the mid-point of the Control​ Point interval, therefore only Tomotherapeutic Leaf Open Durations (3010,0099) is provided.​

C.36.18 Robotic-Arm Delivery Device Module​

The Robotic-Arm Delivery Device Module contains robot-specific information pertaining to the physical device. These parameters are​ used to specify or record the treatment, including geometric parameters of the collimation system.​

Table C.36.18-1. Robotic-Arm Delivery Device Module Attributes​

Include Table C.36.2.2.7-1 “Radiation Generation Mode Macro​DefinedCIDforRadiationTypeCodeSequence(300A,067F)isCID​ Attributes”.​ 9525 “Radiation Therapy Particle”.​

Defined CID for Energy Unit Code Sequence (300A,0684) is CID​ 9521 “Radiotherapy Treatment Energy Unit”.​

Defined CID for Radiation Fluence Modifier Code Sequence​ (300A,0683) is CID 9549 “Radiation Generation Mode Types”.​

IncludeTableC.36.2.2.8-1“RTBeamLimitingDevicesDefinition​Defined CID for Device Type Code Sequence (3010,002E) within​ Macro Attributes”.​ 'RT Accessory Device Identification Macro' is CID 9541 “Beam​

Limiting Device Types”.​ Include Table C.36.2.2.14-1 “RT Accessory Holders Definition Macro Attributes”.​

- Standard -​

C.36.19 Robotic-Arm Path Module​

The Robotic-Arm Path Module specifies or records how a Robotic Path treatment is to be delivered. Multiple paths are encoded as​ separate RT Radiation instances referred to in the RT Radiation Set IOD.​

Table C.36.19-1. Robotic-Arm Path Module Attributes​

Required if RT Record Flag (300A,0639) is NO and the conditions in​

Section C.36.2.2.5.1.1 are satisfied.​

May be present if RT Record Flag (300A,0639) is YES and the​ conditions in Section C.36.2.2.5.1.1 are satisfied.​

- Standard -​