DICOM PS3.3 2024b - Information Object Definitions
C. Boluses Definition Macro

Table C. specifies the Attributes of the Boluses Definition Macro, which define the geometric configuration elements which cannot vary during delivery.

Table C. Boluses Definition Macro Attributes

Attribute Name



Attribute Description

Number of Boluses



Number of boluses defined in the Bolus Definition Sequence (300A,0673).

Required if RT Radiation Physical and Geometric Content Detail Flag (300A,0638) equals FULL. May be present otherwise.

Bolus Definition Sequence



Bolus device definitions.

Required if Number of Boluses (300A,0674) is present and has a non-zero value.

The number of Items included in this Sequence shall equal the value of Number of Boluses (300A,0674).

>Include Table C. “RT Accessory Device Identification Macro Attributes”.

DCID 9516 “Radiotherapy Bolus Device Type”.

>Device Index



Index of the Device in this Sequence.

The value shall start at 1 and increase monotonically by 1.

>Referenced Defined Device Index



Device Index value that links the device defined by this Sequence Item to the corresponding device in an RT Radiation Instance. The device identification of the two devices may or may not be the same.

The value is the index of a device in the Bolus Definition Sequence (300A,0673) within the single SOP Instance referenced by Referenced RT Instance Sequence (300A,0631).

Required if the Instance referenced in Referenced RT Instance Sequence (300A,0631) contains the device that corresponds to the device defined by this Sequence Item.

See Section C.

>Conceptual Volume Sequence



References a Conceptual Volume that describes the geometry and properties of the bolus.

See Section C.

Zero or one Item shall be included in this Sequence.

>>Include Table 10.34-1 “Conceptual Volume Segmentation Reference And Combination Macro Attributes”.

C. Boluses Definition Macro Attribute Description
C. Conceptual Volume Sequence

The Conceptual Volume Sequence (3010,0025), if present, identifies the segmented Conceptual Volume used to define the bolus. The segment is defined by the Referenced Segment Reference Index (3010,0020) in the Section 10.34 Conceptual Volume Segmentation Reference and Combination Macro.

Alternatively, the bolus may not be associated with a Conceptual Volume. For example, a bolus may cover the entire area of radiation and not require a specific segmentation for definition.

DICOM PS3.3 2024b - Information Object Definitions