DICOM PS3.3 2019b - Information Object Definitions

A.86 RT Second Generation (Current)
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## A.86 RT Second Generation

### A.86.1 RT Second Generation Objects

This section provides a brief description of the IODs of RT Second Generation. Specifically, this description includes:

- The Real-World Object which is represented by the IOD.

- Information as to the scope of the represented object, if appropriate.

#### A.86.1.1 RT Second Generation Common Information

This section provides a description of the Module structure which is shared by the RT Second Generation IODs.

##### A.86.1.1.1 RT Second Generation Entity-Relationship Model

The E-R Model in Figure A.86.1.1.1-1 depicts those components of the DICOM Information Model that are relevant to RT Second Generation IODs.

Figure A.86.1.1.1-1. RT Second Generation IOD Information Model

###### A.86.1.1.1.1 Use of Study and Series in RT Second Generation Radiotherapy

For first generation IODs, no specific semantics are attached to a Study or a Series in RT. Similarly, for RT Second Generation IODs, internal references shall be used to relate and locate SOP Instances rather than making assumptions about how related SOP Instances are grouped into Studies or Series. For practical reasons it may be indicated to create a new Study separate from imaging Studies that are used for radiotherapeutic planning because of billing or reimbursement for Series that contain RT instances.

Implementers should also note that the DICOM Standard, in general, does place some restrictions on how such SOP Instances should be grouped, as defined in Section A.1.2.3.

For non-image modalities like radiotherapy, the Series may not be the most efficient way to search for objects. Instead, an application might find it easier to use references in the RT Course object, Key Object Selection objects or Unified Worklist Procedure Steps to directly retrieve required instances rather than search for them.

#### A.86.1.2 RT Physician Intent Information Object Definition

##### A.86.1.2.1 RT Physician Intent IOD Description

The RT Physician Intent carries the prescriptions by which the physician describes the therapeutic goal and strategy for the radiotherapeutic treatment.

##### A.86.1.2.2 RT Physician Intent IOD Entity-Relationship Model

See Figure A.86.1.1.1-1.

##### A.86.1.2.3 RT Physician Intent IOD Module Table

Table A.86.1.2-1. RT Physician Intent IOD Modules

IE | Module | Reference | Usage
--- | --- | --- | ---
Patient | Patient | C.7.1.1 | M
Clinical Trial Subject | C.7.1.3 | U
Study | General Study | C.7.2.1 | M
Patient Study | C.7.2.2 | U
Clinical Trial Study | C.7.2.3 | U
Series | General Series | C.7.3.1 | M
Clinical Trial Series | C.7.3.2 | U
Enhanced RT Series | C.36.3 | M
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
RT Physician Intent | General Reference | C.12.4 | M
RT Physician Intent | C.36.5 | M
RT Enhanced Prescription | C.36.6 | U
RT Treatment Phase Intent | C.36.7 | C - Required if RT Treatment Phase Intent Presence Flag (3010,0045) equals YES.
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | M
Radiotherapy Common Instance | C.36.4 | M

##### A.86.1.2.4 RT Physician Intent IOD Constraints

###### A.86.1.2.4.1 Modality Attribute

The value of Modality (0008,0060) shall be RTINTENT.

###### A.86.1.2.4.2 Radiotherapy Common Instance Module

Code Sequence | CID
--- | ---
Author Identification Sequence (3010,0019) | Defined CID for Organizational Role Code Sequence (0044,010A) is CID 9536 “Radiotherapy Prescribing and Segmenting Person Roles”.

#### A.86.1.3 RT Segment Annotation Information Object Definition

##### A.86.1.3.1 RT Segment Annotation IOD Description

The RT Segment Annotation IOD annotates any general-purpose entity that represents geometric information such as Segmentation IOD, Surface Segmentation IOD, and RT Structure Set IOD with radiotherapy-specific information that cannot be encoded in the content of the annotated SOP Instance, or overrides that content with new or additional interpretation.

##### A.86.1.3.2 RT Segment Annotation IOD Entity-Relationship Model

See Figure A.86.1.1.1-1.

##### A.86.1.3.3 RT Segment Annotation IOD Module Table

Table A.86.1.3-1. RT Segment Annotation IOD Modules

IE | Module | Reference | Usage
--- | --- | --- | ---
Patient | Patient | C.7.1.1 | M
Clinical Trial Subject | C.7.1.3 | U
Study | General Study | C.7.2.1 | M
Patient Study | C.7.2.2 | U
Clinical Trial Study | C.7.2.3 | U
Series | General Series | C.7.3.1 | M
Clinical Trial Series | C.7.3.2 | U
Enhanced RT Series | C.36.3 | M
Equipment | General Equipment | C.7.5.1 | M
Enhanced General Equipment | C.7.5.2 | M
RT Segment Annotation | RT Segment Annotation | C.36.8 | M
Segment Reference | C.36.9 | M
General Reference | C.12.4 | M
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | M
Radiotherapy Common Instance Module | C.36.4 | M

##### A.86.1.3.4 RT Segment Annotation IOD Constraints

###### A.86.1.3.4.1 Modality Attribute

The value of Modality (0008,0060) shall be RTSEGANN.

###### A.86.1.3.4.2 Radiotherapy Common Instance Module

Code Sequence | CID
--- | ---
Author Identification Sequence (3010,0019) | Defined CID for Organizational Role Code Sequence (0044,010A) is CID 9536 “Radiotherapy Prescribing and Segmenting Person Roles”.

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DICOM PS3.3 2019b - Information Object Definitions