DICOM PS3.3 2020d - Information Object Definitions

C.36.21 RT Dose Contribution Record Module (Current)
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### C.36.21 RT Dose Contribution Record Module

The RT Dose Contribution Record Module contains information about the delivered dose.

Table C.36.21-1. RT Dose Contribution Record Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Radiation Dose Identification Sequence | (300A,0618) | 1 | Identifies the dose values that are recorded by this RT Radiation Record Set IOD. One or more Items shall be included in this Sequence.
>Radiation Dose Identification Index | (300A,0603) | 1 | Index of this Item in this Sequence. The value shall start at 1 and increase monotonically by 1.
>Referenced Radiation Dose Identification Index | (300A,060C) | 1C | Radiation Dose Identification Index value that links the Radiation Dose Identification defined by this Sequence Item to the corresponding Item in an RT Radiation Set Instance. Required if the Instance referenced in Referenced RT Radiation Set Sequence (300A,0702) contains a Radiation Dose Identification Sequence Item that corresponds to this Radiation Dose Identification Item.
>Radiation Dose Identification Label | (300A,0619) | 1 | User-defined label for the Radiation Dose Identification. See Section C.36.2.1.1.1.
>Conceptual Volume Sequence | (3010,0025) | 1 | Reference to a Conceptual Volume which received dose during treatment delivery. See Section C.36.21.1.1. Only a single Item shall be included in this Sequence.
>>Include Table 10.34-1, “Conceptual Volume Segmentation Reference And Combination Macro Attributes”
Radiation Dose Sequence | (300A,0617) | 1 | Describes dose contributed by referenced RT Radiation Record SOP instances. For every SOP instance referenced in Referenced RT Radiation Record Sequence (300A,0703) exactly one item shall be present in this Sequence.
>Referenced RT Radiation Record Sequence | (300A,0703) | 1 | The RT Radiation Record SOP Instance that describes parameters for dose delivery of the recorded Radiotherapy treatment for the Fraction specified in RT Radiation Set Delivery Number (300A,0704). Only a single Item shall be included in this Sequence. See Section C.36.20.1.1.
>>Include Table 10-11, “SOP Instance Reference Macro Attributes”
>Radiation Dose Values Parameters Sequence | (300A,061F) | 1C | Dose values of this RT Radiation Record with respect to the dose identification items defined in the Radiation Dose Identification Sequence (300A,0618). Required if Measured Meterset to Dose Mapping Sequence (300A,0772) is not present. May be present otherwise. The number of Items included in this Sequence shall be the same as the number of Items in the Radiation Dose Identification Sequence (300A,0618).
>>Referenced Radiation Dose Identification Index | (300A,060C) | 1 | The value of Radiation Dose Identification Index (300A,0603) in the Radiation Dose Identification Sequence (300A,0618) identifying the dose contribution to which this Item in the Radiation Dose Values Parameters Sequence (300A,061F) applies.
>>Meterset to Dose Mapping Sequence | (300A,0620) | 1 | Mapping of Cumulative Meterset (300A,063C) to Radiation Dose Value (300A,0625). This may be as defined in the RT Radiation Set for the RT Radiation or calculated for this RT Radiation Record Set. See Section C.36.11.1.1. Two or more Items shall be included in this Sequence.
>>>Cumulative Meterset | (300A,063C) | 1 | Cumulative Meterset where a dose value is delivered. See Section C.36.11.1.1.
>>>Radiation Dose Value | (300A,0625) | 1 | Dose value (in Gy) delivered at the corresponding Cumulative Meterset (300A,063C). See Section C.36.11.1.5.
>>>Include Table C.36.2.1.5-1, “Radiobiological Dose Effect Description Macro Attributes”
>Measured Meterset to Dose Mapping Sequence | (300A,0772) | 1C | Measured dose values of this delivered radiation mapped to Meterset values. Required if Dose Mapping Sequence (300A,0620) is not present. May be present otherwise. One or more Items shall be included in this Sequence.
>>Referenced Expected In-Vivo Measurement Value Index | (300A,0773) | 3 | Expected In-Vivo Measurement Value Index (300A,0622) in the Expected In-Vivo Measurement Value Sequence (300A,0621) from the RT Radiation Set Instance that is being recorded.
>>Cumulative Meterset | (300A,063C) | 1 | Cumulative Meterset where a dose value is delivered.
>>Radiation Dose Value | (300A,0625) | 1 | Dose value in Gy delivered at the corresponding Cumulative Meterset (300A,063C) of the current SOP Instance.
>>Dose Measurement Device Code Sequence | (300A,0774) | 2 | Device used to measure the dose data. Zero or one Itemshall be included in this Sequence.
>>>Include Table 8.8-1, “Code Sequence Macro Attributes” | DCID 7026 “Radiotherapeutic Dose Measurement Devices”
>>Measured Dose Description | (3008,0012) | 3 | User-defined description of Measured Dose (e.g. "Exit dose", "Point A").

#### C.36.21.1 RT Dose Contribution Record Module Attribute Descriptions

##### C.36.21.1.1 Conceptual Volume Sequence

The Conceptual Volume Sequence (3010,0025) identifies a Conceptual Volume defining a volume for which dose has been recorded during treatments.

If the Conceptual Volume is associated with a segment, the segment is defined by the Referenced Segment Reference Index (3010,0020) in the Conceptual Volume Segmentation Reference and Combination Macro (see Section 10.34).

Alternatively, the Conceptual Volume might not be associated with a segment; for example, when dose recording is specified using a nominal dose to a volume and the tracking coefficients are approximated by Meterset values.

Typically, this Module references Conceptual Volumes which have been used in the RT Dose Contribution Module of the RT Radiation Set SOP Instance referenced by the Referenced RT Radiation Set Sequence (300A,0702).

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DICOM PS3.3 2020d - Information Object Definitions