DICOM PS3.3 2020a - Information Object Definitions

C.36.13 RT Radiation Common Module (Current)
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### C.36.13 RT Radiation Common Module

The RT Radiation Common Module contains the Attributes shared by all RT Radiation IODs used for radiation treatment delivery.

Table C.36.13-1. RT Radiation Common Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Include Table 10.9.1-1 “Enhanced Content Identification Macro Attributes”.
RT Radiation Physical and Geometric Content Detail Flag | (300A,0638) | 1 | The level of detail of content within this SOP Instance. Enumerated Values: FULL The physical and geometric parameters of all devices are fully defined and dosimetric information is present. This level of detail is typically present after volumetric planning. IDENT_ONLY The physical and geometric parameters of all devices may not be fully specified, but the devices can be identified and dosimetric information is present. This level of detail is typically present after non-volumetric planning (e.g., 2D planning). GEOMETRY_ONLY The geometric parameters of all devices are fully specified, but no dosimetric information is present. This level of detail is typically present after Virtual Simulation.
RT Record Flag | (300A,0639) | 1 | Whether or not device parameters about actual delivery of treatment to a patient have been recorded. Enumerated Values: YES Values in this Instance are a record of a delivered treatment, based on e.g., read-outs or measurements. NO Values in this Instance are a specification of a treatment to be delivered, e.g., by a treatment planning system.
RT Treatment Technique Code Sequence | (3010,0080) | 1 | Type of treatment technique. Only a single Item shall be included in this Sequence. See Section C.36.13.1.1.
>Include Table 8.8-1 “Code Sequence Macro Attributes”. | CID is defined in the IOD including this Module.
Include Table C.36.2.2.4-1 “RT Treatment Position Macro Attributes”. | See Section C.36.13.1.2.
RT Tolerance Set Sequence | (300A,0629) | 3 | A set of tolerance values to be applied to parameters used for delivery of the RT Radiation. Only a single Item is permitted in this Sequence.
>Include Table C.36.2.2.17-1 “RT Tolerance Set Macro Attributes”.
Treatment Time Limit | (300A,062E) | 3 | The maximum delivery time in seconds. See Section C.36.13.1.3.
Treatment Machine Special Mode Code Sequence | (300A,0635) | 1C | A mode of operation on the treatment machine. Required if a special delivery mode is used for treatment. Only a single Item shall be included in this Sequence. See Section C.36.13.1.4.
>Include Table 8.8-1 “Code Sequence Macro Attributes”. | Defined CID is defined in the IOD including this Module.

#### C.36.13.1 RT Radiation Common Attribute Descriptions

##### C.36.13.1.1 Radiotherapy Procedure Technique Sequence

The RT Treatment Technique Code Sequence (3010,0080) describes the treatment technique, i.e., how the radiation beam is shaped and targeted.

##### C.36.13.1.2 RT Treatment Position Macro

The RT Treatment Position Macro describes how the patient is to be positioned with respect to the delivery device for treatment.

The behavior of the machine regarding the patient position between specified Control Points is outside the scope of this Standard. Communicating devices shall agree on this behavior.

##### C.36.13.1.3 Treatment Time Limit

The Treatment Time Limit (300A,062E) is the maximum time span allowed to deliver a single fraction of this RT Radiation SOP instance. The behavior of the treatment delivery device on exceeding the Treatment Time Limit is up to the implementation. Treatment is expected to terminate upon reaching the Treatment Time Limit (300A,062E) independent of the Meterset and so this Attribute should have a value that accommodates normal variations in delivery.

##### C.36.13.1.4 Treatment Machine Special Mode Sequence

The Treatment Machine Special Mode Code Sequence (300A,0635) contains a code, for example, (130341, DCM, "Total Body Irradiation") or (130342, DCM, "Total Skin Irradiation"), which selects a set of vendor- and machine-specific parameters that alter the treatment parameters and/or safety constraints.

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DICOM PS3.3 2020a - Information Object Definitions