A.20 RT Plan IOD
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## 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

The E-R model for the RT Plan IOD is illustrated in Figure A.20-1.

Figure A.20-1. DICOM RT Plan IOD Information Model

### A.20.3 RT Plan IOD Module Table

Table A.20.3-1. RT Plan 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 | RT Series | C.8.8.1 | M
Clinical Trial Series | C.7.3.2 | U
Frame of Reference | Frame of Reference | C.7.4.1 | U
Equipment | General Equipment | C.7.5.1 | M
Plan | RT General Plan | C.8.8.9 | M
RT Prescription | C.8.8.10 | U
RT Tolerance Tables | C.8.8.11 | U
RT Patient Setup | C.8.8.12 | U
RT Fraction Scheme | C.8.8.13 | U
RT Beams | C.8.8.14 | C - Required if RT Fraction Scheme Module exists and Number of Beams (300A,0080) is greater than zero for one or more fraction groups. Shall not be present, if RT Brachy Application Setups module is present. May be present otherwise.
RT Brachy Application Setups | C.8.8.15 | C - Required if RT Fraction Scheme Module exists and Number of Brachy Application Setups (300A,00A0) is greater than zero for one or more fraction groups. Shall not be present, if RT Beams module is present. May be present otherwise.
Approval | C.8.8.16 | U
SOP Common | C.12.1 | M
Common Instance Reference | C.12.2 | U

### Note

1. Retired. See PS3.3-2011.

2. The Audio Module was previously included in this IOD but has been retired. See PS3.3-2004.

#### A.20.3.1 RT Fraction Scheme Module

The RT Fraction Scheme module is structured to be used together with the RT Beams or RT Brachy Application Setups module. If beams are referenced in the RT Fraction Scheme module, all such beams shall be included in the RT Beams module if it is present. Similarly, if brachy application setups are referenced in the RT Fraction Scheme module, all such setups shall be included in the RT Brachy Application Setups module if it is present. However, the RT Fraction Scheme module can be used without the RT Beams or RT Brachy Application Setups modules if no beams or brachy application setups are referenced, and the RT Beams or RT Brachy Application Setups modules can also be used without the RT Fraction Scheme module if no fraction scheme information is available.

#### A.20.3.2 RT Prescription Module

The RT Prescription module provides for the inclusion of dose prescription information pertinent to the complete plan, which may comprise several fraction schemes, themselves consisting of many beams.

#### A.20.3.3 RT Tolerance Tables Module

The RT Tolerance Tables module provides information concerning machine tolerances as they apply to the whole treatment plan. Tolerances are applied by reference to a tolerance table within the RT Tolerance Tables module for beams contained within the RT Beams module.

#### A.20.3.4 RT Patient Setup Module

The RT Patient Setup module provides information concerning patient setup parameters and fixation devices as they apply to the whole treatment plan. Patient setup information within the RT Patient Setup module is referenced by beams contained within the RT Beams module.

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