Материал: part03

Note​

The Curve Module (Retired) was previously included in the Image IE for this IOD but has been retired. See PS3.3-2004.​

A.17 RT Image IOD​

A.17.1 RT Image IOD Description​

The focus for this Radiotherapy Image IOD (RT Image IOD) is to address the requirements for image transfer found in general radio-​ therapy applications performed on conventional simulators, virtual simulators, and portal imaging devices. Such images have a con-​ ical imaging geometry and may either be acquired directly from the device, or digitized using a film digitizer. Numeric beam data​ parameters may also be recorded with the image, indicating the parameter values at the time the image was taken or created.​

A.17.2 RT Image IOD Entity-Relationship Model​

This IOD uses the E-R Model in Section A.1.2, with only the Image IE below the Series IE.​

A.17.3 RT Image IOD Module Table​

Table A.17.3-1 specifies the Modules of the RT Image IOD.​

Table A.17.3-1. RT Image IOD Modules​

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Note​

1.​The inclusion of the Multi-frame Module allows for the expression of time-dependent image series or multiple exposures​ of identical beam geometries (i.e., multiple exposure portal images). If a time-dependent series of images (such as port​ images or DRRs) is represented the Cine Module is used to indicate this. This would subsequently allow analysis of​ Patient movement during treatment. Multiple exposure images allow individual images of treatment ports and open field​ ports to be grouped into a single multi-frame image.​

2.​The Modality LUT Module has been included to allow the possibility of conversion between portal image pixel values​ and dose transmitted through the Patient. The VOI LUT Module has been included to allow the possibility of translation​ between stored pixel values (after the Modality LUT has been applied if specified) and display levels.​

3.​The Curve Module (Retired) and Audio Module (Retired) were previously included in the Image IE for this IOD but has​ been retired. See PS3.3-2004.​

4.​TheGeneralEquipmentModulecontainsinformationdescribingtheequipmentusedtoacquireorgeneratetheRTImage​ (such as a portal imager, conventional simulator or treatment planning system). However, the equipment Attributes in​ the RT Image Module describe the equipment on which the treatment has been or will be given, typically an electron​ accelerator.​

5.​ForRTImagesthatcontainnorelevantpixeldata,suchasBEVimageswithoutDRRinformation,PixelData(7FE0,0010)​ should be filled with a sequence of zeros.​

6.​TheFrameofReferenceModulehasbeenincludedtoallowtheindicationofspatialassociationoftwoormoreRTImage​ instances (e.g., where the images have been acquired in the same Frame of Reference, or have been resampled to​ share the same Frame of Reference). If the Frame of Reference occurs within a SOP Instance within a given Series,​ then all SOP Instances within that Series will be spatially related. For example, two RT Images may share the same​ Frame of Reference if they are located on the same physical plane, as determined by the treatment machine Gantry​ Angle (300A,011E) and source to image plane distance specified by RT Image SID (3002,0026).​

A.18 RT Dose IOD​

A.18.1 RT Dose IOD Description​

The focus for this Radiotherapy Dose IOD (RT Dose IOD) is to address the requirements for transfer of dose distributions calculated​ by radiotherapy treatment planning systems. These distributions may be represented as 2D or 3D grids, as isodose curves, or as​ named or unnamed dose points scattered throughout the volume. This IOD may also contain dose-volume histogram data, single or​ multi-frameoverlaysandapplication-definedlookuptables.ThisIODdoesnotprovidefordefinitionofdosesinbeamorothercoordinate​ systems. The application is responsible for transforming data in other, Non-Patient-Based Coordinate Systems to the Patient-Based​ Coordinate System described in Section C.7.6.2.1.1.​

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A.18.2 RT Dose IOD Entity-Relationship Model​

This IOD uses the E-R Model in Section A.1.2, with only the Dose IE below the Series IE.​

A.18.3 RT Dose IOD Module Table​

Table A.18.3-1 specifies the Modules of the RT Dose IOD.​

Table A.18.3-1. RT Dose IOD Modules​

Note​

1.​Within the RT Dose IOD, the RT Dose Module supports 2D and 3D dose grids. The Structure Set Module, ROI Contour​ Module and RT Dose ROI Module together support isodose curves and points, and the RT DVH Module supports dose-​ volume histogram data. They are not mutually exclusive: all four representations may be included in a single instance​

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of the object or they may be included in any combination. Product Conformance Statements should clearly state which​ of these mechanisms is supported and under what conditions.​

2.​The RT Dose IOD has been defined as a composite IOD, separate from the RT Plan IOD. This has been done for the​ following reasons:​

•​to allow for the multiplicity of possible dose calculations using beam models for the same basic plan,​

•​to avoid undesirable transmission of large amounts of data with the treatment plan, and​

•​to accommodate the fact that CT Simulation and other "beam geometry" generating devices that use the RT Plan​ IOD do not have or require access to this data, either for transmission or storage.​

3.​The Audio Module (Retired) was previously included in this IOD but has been retired. See PS3.3-2004.​

A.19 RT Structure Set IOD​

A.19.1 RT Structure Set IOD Description​

The focus for this Radiotherapy Structure Set IOD (RT Structure Set IOD) is to address the requirements for transfer of Patient​ structures and related data defined on CT scanners, virtual simulation workstations, treatment planning systems and similar devices.​

A.19.2 RT Structure Set IOD Entity-Relationship Model​

This IOD uses the E-R Model in Section A.1.2, with only the Structure Set IE below the Series IE.​

A.19.3 RT Structure Set IOD Module Table​

Table A.19.3-1 specifies the Modules of the RT Structure Set IOD.​

Table A.19.3-1. RT Structure Set IOD Modules​

Note​

1.​The Audio Module (Retired) was previously included in this IOD but has been retired. See PS3.3-2004.​

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2.​Previously the Frame of Reference Module was not included (see PS3.3-2014b). Historically, more than one Frame of​ ReferencecouldbereferencedwithintheStructureSetModule'sReferencedFrameofReferenceSequence(3006,0010),​ in which case the Frame of Reference Module would not have been present.​

A.19.4 RT Structure Set IOD Content Constraints​

The Defined CID for Purpose of Reference Code Sequence (0040,A170) within Source Instance Sequence (0042,0013) in the Gen-​ eral Reference Module shall be CID 7019 “Segmentation Non-Image Source Purposes of Reference”.​

A.20 RT Plan IOD​

A.20.1 RT Plan IOD Description​

The focus for this Radiotherapy Plan IOD (RT Plan IOD) is to address the requirements for transfer of treatment plans generated by​ manual entry, a virtual simulation system, or a treatment planning system before or during a course of treatment. Such plans may​ contain fractionation information, and define external beams and/or brachytherapy application setups.​

A.20.2 RT Plan IOD Entity-Relationship Model​

This IOD uses the E-R Model in Section A.1.2, with only the Plan IE below the Series IE.​

A.20.3 RT Plan IOD Module Table​

Table A.20.3-1 specifies the Modules of the RT Plan IOD.​

Table A.20.3-1. RT Plan IOD Modules​

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