DICOM PS3.3 2021e - Information Object Definitions

C.36.23 RT Radiation Salvage Record Module

The RT Radiation Salvage Record Module contains information about the values which have been recorded when recording by the modality-specific RT Radiation Record IOD was not possible and thus only a minimal subset of Attributes is present.

Table C.36.23-1. RT Radiation Salvage Record Module Attributes

Attribute Name

Tag

Type

Attribute Description

Include Table C.36.2.2.7-1, “Radiation Generation Mode Macro Attributes”.

Starting Meterset Value Known Flag

(300A,0723)

1

Whether it is known that the value of the Cumulative Meterset at the first recorded RT Control Point represents the actual value at the start of the treatment delivery.

Enumerated Values:

NO

The Cumulative Meterset at the first recorded RT Control Point may have an estimated or arbitrary value.

YES

The Cumulative Meterset at the first recorded RT Control Point has the actual value at which the treatment was started or resumed.

Optionally, all other Attributes at Instance level that are part of the RT Radiation SOP Instance referenced in Referenced RT Instance Sequence (300A,0631), describing the delivery device. See Section C.36.23.1.1.

Number of RT Control Points

(300A,0604)

1

Number of RT Control Points in the RT Radiation Salvage Record Control Point Sequence (300A,0722).

The value shall be equal to or greater than 2.

RT Radiation Salvage Record Control Point Sequence

(300A,0722)

1

Control Points used to record the beam delivery.

The number of Items included in this Sequence shall equal the value of Number of RT Control Points (300A,0604).

>Include Table C.36.2.2.5-1, “RT Control Point General Macro Attributes”

>Referenced Radiation Generation Mode Index

(300A,0605)

1C

The value of Radiation Generation Mode Index (300A,0601) in the Radiation Generation Mode Sequence (300A,067B) in this IOD that defines the Radiation Generation Mode used for this Control Point.

Required if Number of Radiation Generation Modes (300A,0685) is present and the conditions in Section C.36.2.2.5.1.1are satisfied.

>Optionally, all other Attributes at RT Control Point level that are part of the RT Radiation SOP Instance referenced in Referenced RT Instance Sequence (300A,0631). See Section C.36.23.1.1.


C.36.23.1 RT Radiation Salvage Record Module Attribute Descriptions

C.36.23.1.1 Recorded Parameter

Additional optional Attributes contain values which are known after the termination of the treatment delivery. Any subset of Attributes of the referenced RT Radiation SOP Instance may be provided. If present, an Attribute shall be enclosed in the nested Sequence as it appears in the referenced RT Radiation SOP Instance. If additional parameters are supported these are expected to be documented in an implementation's Conformance Statement.

Example

The following example shows the recording of a Source Gantry Angle of 5 deg and the Y Jaw Openings of 2/3 mm at Control Point 7.

Table C.36.23-2. Additional Optional Parameter Example

Attribute

Tag

Additional Optional Parameter

Value

...

Starting Meterset Value Known Flag

(300A,0723)

No

YES

...

RT Beam Limiting Device Definition Sequence

(300A,0641)

Yes

>Device Index

(3010,0039)

Yes

2

>Beam Modifier Orientation Angle

(300A,0645)

Yes

90

>Device Type Code Sequence

(3010,002E)

Yes

(130330, DCM, "Jaw Pair")

>Parallel RT Beam Delimiter Device Sequence

(300A,0648)

Yes

>>Parallel RT Beam Delimiter Device Orientation Label Code Sequence

(300A,0644)

Yes

(130335, DCM, "Y Orientation")

...

RT Radiation Salvage Record Control Point Sequence

(300A,0722)

No

>RT Control Point Index

(300A,0600)

No

7

...

>Source Roll Angle

(300A,067A)

Yes

5

>RT Beam Limiting Device Opening Sequence

(300A,0656)

Yes

>>Referenced Device Index

(300A,0607)

Yes

2

>>Parallel RT Beam Delimiter Positions

(300A,064A)

Yes

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DICOM PS3.3 2021e - Information Object Definitions