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DICOM PS3.3 2020a - Information Object Definitions​

Page 1621​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Number of Block Slab​

(300A,0440)​

1C​

Number of slabs composing the block if the block has been sliced parallel​

Items​

 

 

to the Beam ModifierDefinition Plane. If the block has not been sliced the​

 

 

 

value shall be zero.​

 

 

 

 

Required if RT Radiation Physical and Geometric Content Detail Flag​

 

 

 

(300A,0638) equals FULL. May be present otherwise.​

 

>Block Slab Sequence​

(300A,0441)​

1C​

Sequence of slab(s) that comprise the block.​

 

 

 

 

Required if Number of Block Slab Items (300A,0440) is present and has a​

 

 

 

value greater than 1.​

 

 

 

 

The number of Items included in this Sequence shall equal the value of​

 

 

 

Number of Block Slab Items (300A,0440).​

 

>>Block Slab Number​

(300A,0043)​

1​

Identification number of the Block Slab.​

 

 

 

 

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

 

 

 

 

Thenumberindicatestheorderoftheslabswithrespecttothesource,where​

 

 

 

Number 1 corresponds to the slab nearest to the source.​

 

>>Radiation Beam Block​

(300A,066E)​

3​

Physical thickness of block slab in mm in a direction parallel to the radiation​

Slab Thickness​

 

 

beam axis.​

 

 

 

 

The sum of Radiation Beam Block Slab Thickness (300A,066E) values in​

 

 

 

all Items of this Sequence must equal the Radiation Beam Block Thickness​

 

 

 

(300A,066D) of the block.​

 

>>Device Alternate​

(3010,001B)​

2​

An identifier intended to be read by a device such as a bar code reader.​

Identifier​

 

 

 

 

>>Device Alternate​

(3010,001C)​

1C​

Defines the type of Device Alternate Identifier.​

 

Identifier Type​

 

 

Required if Device Alternate Identifier (3010,001B) is present.​

 

 

 

 

 

 

 

 

Defined Terms:​

 

 

 

 

BARCODE​

 

 

 

 

RFID​

 

>>Device Alternate​

(3010,001D)​

1C​

DescriptionoftheformatinwhichtheDeviceAlternateIdentifier(3010,001B)​

Identifier Format​

 

 

is issued.​

 

Required if Device Alternate Identifier (3010,001B) is present.​

See Section 10.36.1.1.​

C.36.2.2.14 RT Accessory Holders Definition Macro​

This Macro defines the geometric configuration elements which cannot vary during delivery and which are used to hold accessories​ such as blocks or compensators.​

Table C.36.2.2.14-1. RT Accessory Holders Definition Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Number of RT Accessory​

(300A,0670)​

1C​

Number of RT Accessory Holders defined in the RT Accessory Holder​

Holders​

 

 

Definition Sequence (300A,0614).​

 

 

 

Required if RT Radiation Physical and Geometric Content Detail Flag​

 

 

 

(300A,0638) equals FULL. May be present otherwise.​

- Standard -​

Page 1622​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

RT Accessory Holder​

(300A,0614)​

1C​

Accessory Holder device definitions.​

Definition Sequence​

 

 

Required if Number of RT Accessory Holders (300A,0670) is present​

 

 

 

 

 

 

and has a non-zero value.​

 

 

 

The number of Items included in this Sequence shall equal the value​

 

 

 

ofNumber of RT Accessory Holders (300A,0670).​

>Include Table C.36.2.2.3-1 “RT Accessory Device​

DCID 9518 “Radiotherapy Accessory No-slot Holder Device Types”.​

Identification Macro Attributes”.​

 

DCID 9519 “Radiotherapy Accessory Slot Holder Device Types”.​

 

 

 

>Device Index​

(3010,0039)​

1​

Index of the Device in this Sequence.​

 

 

 

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

>ReferencedDefinedDevice​

(300A,0602)​

1C​

Device Index value that links the device defined by this Sequence Item​

Index​

 

 

tothecorrespondingdeviceinanRTRadiationInstance.Thedescription​

 

 

 

of the two devices may or may not be the same.​

 

 

 

The value is the index of a device in the RT Accessory Holder Definition​

 

 

 

Sequence (300A,0614) within the single SOP Instance referenced by​

 

 

 

Referenced RT Instance Sequence (300A,0631).​

 

 

 

RequirediftheInstancereferencedinReferencedRTInstanceSequence​

 

 

 

(300A,0631)containsthedevicethatcorrespondstothedevicedefined​

 

 

 

by this Sequence Item.​

>Beam Modifier Orientation​

(300A,0645)​

1​

Angle in degrees of the Beam Modifier Coordinate System with respect​

Angle​

 

 

to the Base Beam Modifier Coordinate System. The angle is a​

 

 

 

Continuous Rotation Angle, see Section C.36.1.1.5.​

 

 

 

See Section C.36.1.1.9.​

>RT Accessory Holder​

(300A,060D)​

2​

Water-Equivalent thickness in mm of the Accessory Holder parallel to​

Water-Equivalent Thickness​

 

 

the radiation beam axis.​

>RT Accessory Holder Slot​

(300A,060F)​

1​

Indicates whether the RT Accessory Holder has slots in which other RT​

Existence Flag​

 

 

Accessory Holders or beam modifying devices can be inserted.​

 

 

 

Enumerated Values:​

 

 

 

YES​The RT Accessory Holder has one or more slots.​

 

 

 

NO​ The RT Accessory Holder has no slots.​

>RT Accessory Holder Slot​

(300A,0610)​

1C​

Slots being available in this Accessory Holder.​

Sequence​

 

 

Required if RT Radiation Physical and Geometric Content Detail Flag​

 

 

 

 

 

 

(300A,0638)equalsFULLandRTAccessoryHolderSlotExistenceFlag​

 

 

 

(300A,060F) has the value YES..​

 

 

 

MaybepresentifRTAccessoryHolderSlotExistenceFlag(300A,060F)​

 

 

 

has the value YES.​

 

 

 

One or more Items shall be included in this Sequence.​

>>RT Accessory Holder Slot​

(300A,0611)​

1​

The ID of the slot where accessories are inserted.​

ID​

 

 

 

>>RT Accessory Holder Slot​

(300A,0612)​

2​

Distance in mm from the reference location as specified by RT Device​

Distance​

 

 

Distance Reference Location Code Sequence (300A,0659) to the slot​

 

 

 

along the radiation beam axis.​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 1623​

C.36.2.2.14.1 RT Accessory Holders Description​

A treatmentdeliveryunit mayallowthe attachment of one ormore accessoryholders within which theusermayinstallvariousdevices​ for applying the beam to the patient. These installed devices may include, but not be limited to, one or more of the following items:​

•​custom blocks for patient-specific lateral collimation (beam limiting),​

•​pre-collimators for general lateral collimation (beam limiting),​

•​uniform thickness range shifter for modifying the range uniformly across the beam,​

•​two-dimensional range shifters (custom boluses) for modifying the range differentially across the defined field,​

•​ridge filters for creating multiple ranges within the beam,​

•​cross-wires for aligning the patient with the beam,​

•​a mirror or camera for aligning or viewing the irradiated area,​

•​beam monitoring detectors,​

•​applicator sealer for preventing fluids from entering the applicator.​

The following example illustrates the use of the RT Accessory Holders Macro and the RT Accessory Device Identification Macro:​

•​The gantry head has a slot called Acc Mount.​

•​In this example, an electron applicator is mounted in that slot. The electron applicator itself has a slot called E Aperture, where​ other accessories can be mounted. Therefore the electron applicator is an RT Accessory Holder, which includes a slot sequence​ to model that slot.​

•​In this example, a block tray is mounted in the E Aperture slot. The block tray can support blocks, therefore it is an RT Accessory​ Holder, but the slot sequence is absent in the block tray definition, since the tray has no slots.​

•​The block is an RT Accessory, which is mounted in the block tray.​

Figure C.36.2.2.14.1-1. RT Accessory Holders​

- Standard -​

Page 1624​

DICOM PS3.3 2020a - Information Object Definitions​

C.36.2.2.15 General Accessories Definition Macro​

This Macro defines the geometric configuration elements which cannot vary during delivery.​

Table C.36.2.2.15-1. General Accessories Definition Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Number of General​

(300A,0672)​

1C​

Number of General Accessories defined in the General Accessory​

Accessories​

 

 

Definition Sequence (300A,0671).​

 

 

 

Required if RT Radiation Physical and Geometric Content Detail Flag​

 

 

 

(300A,0638) equals FULL. May be present otherwise.​

General Accessory​

(300A,0671)​

1C​

General accessory devices.​

Definition Sequence​

 

 

Required if the Number of General Accessories (300A,0672) is present​

 

 

 

 

 

 

and has a non-zero value.​

 

 

 

The number of Items included in this Sequence shall equal the value​

 

 

 

of Number of General Accessories (300A,0672).​

>Include Table C.36.2.2.3-1 “RT Accessory Device​

BCID 9548 “General Accessory Device Types”.​

Identification Macro Attributes”.​

 

 

>Device Index​

(3010,0039)​

1​

Index of the Device in this Sequence.​

 

 

 

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

>Referenced Defined​

(300A,0602)​

1C​

Device Index value that links the device defined by this Sequence Item​

Device Index​

 

 

tothecorrespondingdeviceinanRTRadiationInstance.Thedescription​

 

 

 

of the two devices may or may not be the same.​

 

 

 

The value is the index of a device in the General Accessory Definition​

 

 

 

Sequence (300A,0671) 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.​

>Beam Modifier​

(300A,0645)​

1​

Angle in degrees of the Beam Modifier Coordinate System with respect​

Orientation Angle​

 

 

to the Base Beam Modifier Coordinate System. The angle is a​

 

 

 

Continuous Rotation Angle, see Section C.36.1.1.5.​

See Section C.36.1.1.9.​

C.36.2.2.16 Boluses Definition Macro​

This Macro defines the geometric configuration elements which cannot vary during delivery.​

Table C.36.2.2.16-1. Boluses Definition Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Number of Boluses​

(300A,0674)​

1C​

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.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1625​

Attribute Name​

Tag​

Type​

Attribute Description​

 

BolusDefinitionSequence​

(300A,0673)​

1C​

Bolus device definitions.​

 

 

 

 

Required if Number of Boluses (300A,0674) is present and has a​

 

 

 

non-zero value.​

 

 

 

 

ThenumberofItemsincludedinthisSequenceshallequalthevalue​

 

 

 

ofNumber of Boluses (300A,0674).​

 

>IncludeTableC.36.2.2.3-1“RTAccessoryDeviceIdentification​DCID 9516 “Radiotherapy Bolus Device Types”.​

 

Macro Attributes”.​

 

 

 

 

>Device Index​

(3010,0039)​

1​

Index of the Device in this Sequence.​

 

 

 

 

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

>Referenced Defined​

(300A,0602)​

1C​

Device Index value that links the device defined by this Sequence​

Device Index​

 

 

Item to the corresponding device in an RT Radiation Instance. The​

 

 

 

description 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.​

 

>Conceptual Volume​

(3010,0025)​

2​

References a Conceptual Volume that describes the geometry and​

Sequence​

 

 

properties of the bolus.​

 

See Section C.36.2.2.16.1.1.​

Zero or one Item shall be included in this Sequence.​

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

C.36.2.2.16.1 Boluses Definition Macro Attribute Description​

C.36.2.2.16.1.1 Conceptual Volume Sequence​

The Conceptual Volume Sequence (3010,0025), if present, identifies the segmented Conceptual Volume used to define the bolus.​ ThesegmentisdefinedbytheReferencedSegmentReferenceIndex(3010,0020)intheConceptualVolumeSegmentationReference​ and Combination Macro (see Section 10.34).​

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.​

C.36.2.2.17 RT Tolerance Set Macro​

The RT Tolerance Set Macro contains information describing the maximum differences between planned and delivered values. This​ information is used in the context of delivery of the RT Radiation Set. If the absolute difference between a planned and delivered​ value exceeds the tolerance value, then it is expected that the delivery of the RT Radiation Set will be inhibited unless an authorized​ operator confirms that the tolerance may be exceeded.​

Table C.36.2.2.17-1. RT Tolerance Set Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

RT Tolerance Set Label​

(300A,062A)​

1​

User defined label for the Tolerance Set.​

- Standard -​

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