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Page 1606​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Radiation Generation Mode​

(300A,067B)​

1C​

Radiation Generation Modes defining the type of radiation and​

Sequence​

 

 

characteristics of the beam generated.​

 

 

 

RadiationGenerationModesshallcharacterizedifferentprimary​

 

 

 

beam fluence.​

 

 

 

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

 

 

 

value of Number of Radiation Generation Modes(300A,0685).​

 

 

 

RequiredifNumberofRadiationGenerationModes(300A,0685)​

 

 

 

is present.​

>Radiation Generation Mode​

(300A,0601)​

1​

Index of this Item in this Sequence.​

Index​

 

 

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

 

 

 

>Radiation Generation Mode​

(300A,067C)​

1​

User-definedlabelthatidentifiesthisRadiationGenerationMode.​

Label​

 

 

See Section C.36.2.2.7.1.3.​

 

 

 

>Radiation Generation Mode​

(300A,067D)​

2​

User-defined description of the Radiation Generation Mode.​

Description​

 

 

 

>Radiation Generation Mode​

(300A,067E)​

1C​

A vendor-specified machine-readable code that unambiguously​

Machine Code Sequence​

 

 

identifies this Radiation Generation Mode.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

RequiredifRTRadiationPhysicalandGeometricContentDetail​

 

 

 

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

 

 

 

See Section C.36.2.2.7.1.2.​

>>Include Table 8.8-1 “Code Sequence Macro Attributes”.​

No Baseline CID is defined.​

>Radiation Type Code​

(300A,067F)​

1​

Type of radiation for this Radiation Generation Mode.​

Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>>Include Table 8.8-1 “Code Sequence Macro Attributes”.​

CID is defined by invocation.​

>Energy Unit Code Sequence​

(300A,0684)​

1​

The unit of energy values specified in Nominal Energy​

 

 

 

(300A,0680),MinimumNominalEnergy(300A,0681),Maximum​

 

 

 

Nominal Energy (300A,0682).​

 

 

 

Only a single Item shall be included in this Sequence.​

>>Include Table 8.8-1 “Code Sequence Macro Attributes”.​

CID is defined by invocation.​

>Nominal Energy​

(300A,0680)​

1C​

The nominal beam energyin units as defined in the Energy Unit​

 

 

 

Code Sequence (300A,0684).​

 

 

 

RequiredifMinimumNominalEnergy(300A,0681)andMaximum​

 

 

 

Nominal Energy (300A,0682) are not present.​

 

 

 

See Section C.36.2.2.7.1.1.​

>Minimum Nominal Energy​

(300A,0681)​

1C​

The minimum nominal beam energyin units as defined in the​

Energy Unit Code Sequence (300A,0684).​

Required if Nominal Energy (300A,0680) is not present.​

See Section C.36.2.2.7.1.1.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1607​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Maximum Nominal Energy​

(300A,0682)​

1C​

The maximum nominal beam energy in units as defined in the​

 

 

 

Energy Unit Code Sequence (300A,0684).​

 

 

 

 

Required if Nominal Energy (300A,0680) is not present.​

 

 

 

See Section C.36.2.2.7.1.1.​

 

>Radiation Fluence Modifier​

(300A,0683)​

1​

IdentifiesthetypeoffluencemodifierofthisRadiationGeneration​

Code Sequence​

 

 

Mode.​

 

 

 

 

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

>>Include Table 8.8-1 “Code Sequence Macro Attributes”.​

CID is defined by invocation.​

 

>Radiation Device​

(300A,065A)​

2​

Keys identifying the configuration and commissioning data used​

Configuration and​

 

 

as input for treatment planning of this Instance.​

 

CommissioningKeySequence​

 

 

Value Type (0040,A040) is constrained to value UIDREF.​

 

 

 

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

>>Include Table 10-2 “Content Item Macro Attributes Description”.​No Baseline CID defined.​

C.36.2.2.7.1 Radiation Generation Mode Macro Attribute Description​

C.36.2.2.7.1.1 Energy Attributes​

The Nominal Energy (300A,0680) parameter is provided for beams where a single discrete energy is annotated by that value. Energy​ modulationcanbeusedattheControlPointlevel(bothdiscreteandcontinuous),inwhichcasetheMinimalNominalEnergy(300A,0681)​ and Maximal Nominal Energy (300A,0682) are used.​

C.36.2.2.7.1.2 Radiation Generation Mode Machine Code​

When two Radiation Generation Modes differ in any value ofNominal Energy (300A,0680), Minimum Nominal Energy (300A,0681),​ Maximum Nominal Energy (300A,0682) or any code value(s) of theRadiation Type Code Sequence (300A,067F) or the Radiation​ Fluence Modifier Code Sequence(300A,0683), the Radiation Generation Modes must have different values for Radiation Generation​ Mode Machine Code. Even if all those attributes have the same values, the two modes may still have a different value for Radiation​ Generation Mode Machine Code, e.g., when other device-specific beam generation steering parameters differ.​

C.36.2.2.7.1.3 Radiation Generation Mode Label​

RadiationGenerationModeLabel(300A,067C)shoulduniquelyidentifyaspecificmodewithinatreatmentdevice.Thelabelisintended​ onlyfordisplaytohumanreaders,whiletheauthoritativedefinitionoftheRadiationGenerationModeiscontainedintheotherattributes​ of the Sequence.​

C.36.2.2.8 RT Beam Limiting Devices Definition Macro​

This Macro describes the configuration of Beam Limiting Devices which cannot vary during delivery.​

Table C.36.2.2.8-1. RT Beam Limiting Devices Definition Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

NumberofRTBeamLimiting​ (300A,0641)​

1C​

Number of RT Beam Limiting Devices in the RT Beam Limiting Device​

Devices​

 

 

Definition Sequence (300A,064D).​

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

- Standard -​

Page 1608​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

RT Beam Limiting Device​

(300A,064D)​

1C​

Beam limiting device (collimator), such as jaw or leaf (element) sets.​

Definition Sequence​

 

 

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

 

 

 

 

 

 

Number of RT Beam Limiting Devices (300A,0641).​

 

 

 

RequiredifNumberofRTBeamLimitingDevices(300A,0641)ispresent​

 

 

 

and has a non-zero value.​

>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 Beam Limiting Device​

 

 

 

Definition Sequence (300A,064D) within the single SOP Instance​

 

 

 

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

 

 

 

RequirediftheInstancereferencedinReferencedRTInstanceSequence​

 

 

 

(300A,0631) contains the device that corresponds to the device defined​

 

 

 

by this Sequence Item.​

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

CID is defined by invocation.​

Identification Macro Attributes”.​

 

 

>Beam Modifier Orientation​ (300A,0645)​

1​

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

Angle​

 

 

totheBaseBeamModifierCoordinateSystem.TheangleisaContinuous​

 

 

 

Rotation Angle, see Section C.36.1.1.5.​

 

 

 

If Device Type Code Sequence (3010,002E) contains either (130331,​

 

 

 

DCM, "Leaf Pairs"), or (130333, DCM, "Single Leaves") the motion of the​

 

 

 

RT Beam Delimiters is along the x-axis of the Beam Modifier Definition​

 

 

 

Plane.​

 

 

 

See Section C.36.1.1.9.​

>RT Beam Limiting Device​

(300A,0642)​

2​

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

Proximal Distance​

 

 

DistanceReferenceLocationCodeSequence(300A,0659)totheproximal​

 

 

 

end of beam limiting device (collimator) along the beam axis.​

 

 

 

See Section C.36.2.2.8.1.4.​

>RT Beam Limiting Device​

(300A,0643)​

2​

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

Distal Distance​

 

 

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

 

 

 

end of beam limiting device (collimator) along the beam axis.​

 

 

 

See Section C.36.2.2.8.1.4.​

>ParallelRTBeamDelimiter​ (300A,0647)​

1C​

Device that uses parallel beam delimiters to limit the beam.​

Device Sequence​

 

 

Required if Device Type Code Sequence (3010,002E) contains either​

 

 

 

 

 

 

(130331, DCM, "Leaf Pairs") or (130333, DCM, "Single Leaves").​

 

 

 

Only a single Item shall be present in the Sequence.​

>>Number of Parallel RT​

(300A,0648)​

1​

Number of beam delimiters parallel to the axis of motion. E.g., a beam​

Beam Delimiters​

 

 

limitingdevicejawpairisrepresentedas1paralleldelimiter,anMLCwith​

 

 

 

100 leaf pairs or with 100 single leaves is represented as 100 parallel​

 

 

 

delimiters.​

See Section C.36.2.2.8.1.3.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1609​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Parallel RT Beam​

(300A,0644)​

1​

A code used to identify the orientation of the beam limiting device.​

DelimiterDeviceOrientation​

 

 

Only a single Item shall be present in the Sequence.​

 

Label Code Sequence​

 

 

 

>>>IncludeTable8.8-1“CodeSequenceMacroAttributes”.​DCID 9547 “RT Beam Limiting Device Orientation Labels”.​

 

 

 

 

See Section C.36.2.2.8.1.1.​

 

>>Parallel RT Beam​

(300A,064E)​

1​

The operation mode of Parallel RT Beam Delimiters used to define a​

Delimiter Opening Mode​

 

 

treatment aperture.​

 

 

 

 

Enumerated Values:​

 

 

 

 

BINARY​ leaf positions constrained to two states: open and closed​

 

 

 

VARIABLE​any leaf position may be specified​

 

>>Parallel RT Beam​

(300A,0649)​

1​

Boundaries in mm of parallel beam delimiters. These are defined along​

Delimiter Boundaries​

 

 

the axis perpendicular to the motion of the delimiters of the RT Beam​

 

 

 

Limiting Device Type (300A,00B8) with respect to the Beam Modifier​

 

 

 

Coordinate System. The order of values shall increase monotonically.​

 

 

 

See Section C.36.2.2.8.1.2.​

 

 

 

 

N+1valuesshallbeprovided,whereNistheNumberofParallelRTBeam​

 

 

 

Delimiters (300A,0648).​

 

>>Parallel RT Beam​

(300A,064F)​

1C​

Specifies the mounting side identified by the direction from the tip to the​

DelimiterLeafMountingSide​

 

 

tail of the delimiter parallel to the axis specified by Device Type Code​

 

 

 

Sequence (3010,002E).​

 

 

 

 

Enumerated Values:​

 

 

 

 

P​Positive mounting side. The axis intercept of the leaf tip is less than​

 

 

 

the axis intercept of the leaf tail.​

 

 

 

 

N​Negative mounting side. The axis intercept of the leaf tip is greater​

 

 

 

than the axis intercept of the leaf tail.​

 

 

 

 

M​valuesshallbeprovided,whereMistheNumberofParallelRTBeam​

 

 

 

Delimiters(300A,0648),intheorderoftheParallelRTBeamDelimiter​

 

 

 

Boundaries (300A,0649).​

 

 

 

 

RequiredifDeviceTypeCodeSequence(3010,002E)contains(130333,​

 

 

 

DCM, "Single Leaves").​

 

 

 

 

See Section C.36.2.2.8.1.3.​

 

>Fixed RT Beam Delimiter​

(300A,0646)​

1C​

Device that uses a fixed aperture to limit the beam.​

 

Device Sequence​

 

 

RequiredifDeviceTypeCodeSequence(3010,002E)ispartofCID9545​

 

 

 

 

 

 

Fixed Beam Limiting Device Types.​

 

 

 

 

Only a single Item shall be included in this Sequence.​

 

>>Include Table 10.38-1 “Outline Definition Macro​

The Outline is defined on the Beam Modifier Definition Plane.​

Attributes”.​

 

 

 

 

C.36.2.2.8.1 RT Beam Limiting Device Definition Macro Attribute Description​

C.36.2.2.8.1.1 Parallel RT Beam Delimiter Device Orientation Label Code​

The value of Parallel RT Beam Delimiter Device Orientation Label Code Sequence (300A,0644) shall be choosen as follows:​

When the value of Beam Modifier Orientation Angle (300A,0645) equals zero the code shall be (130334, DCM, "X Orientation").​

When the value of Beam Modifier Orientation Angle (300A,0645) equals 90 the code shall be (130335, DCM, "Y Orientation").​

- Standard -​

Page 1610​

DICOM PS3.3 2020a - Information Object Definitions​

When the value of Beam Modifier Orientation Angle (300A,0645) is not zero or 90, the label should be chosen to best reflect the user​ perception or another code may be used.​

C.36.2.2.8.1.2 Parallel RT Beam Delimiter Boundaries​

The Parallel RT Beam Delimiter Boundaries (300A,0649) shall be the positions of the mechanical boundaries (projected on the Beam​ ModifierDefinitionPlanedefinedbytheRTBeamModifierDefinitionDistance(300A,0688))betweenbeamdelimiterelements.These​ are fixed for a given beam limiting device. Parallel RT Beam Delimiter Positions (300A,064A) are values specific to a given Control​ Point, specifying the beam limiting device element openings.​

C.36.2.2.8.1.3 Number of Parallel RT Beam Delimiters​

Y

Number of Parallel

RT Beam Delimiters

5

4

3

2

1

X

tail

tip

tail

tip

Figure C.36.2.2.8.1-1. Number of Parallel RT Beam Delimiters for X Leaf Pairs​

Y

Number of Parallel

RT Beam Delimiters

5

4

3

2

1

X

tail

tip

tail

tip

Figure C.36.2.2.8.1-2. Number of Parallel RT Beam Delimiters for X Single Leaves​

InexampleinFigureC.36.2.2.8.1-2thedelimiterslabeled1,3and5haveaParallelRTBeamDelimiterLeafMountingSide(300A,064F)​ value of N (negative direction) and the delimiters labeled 2 and 4 have a Parallel RT Beam Delimiter Leaf Mounting Side value of P​ (positive direction).​

C.36.2.2.8.1.4 RT Beam Limiting Device Proximal Distance and RT Beam Limiting Device Distal Distance​

ThefollowingfigureshowstheRTBeamLimitingDeviceProximalDistance(300A,0642)andRTBeamLimitingDeviceDistalDistance​ (300A,0643).​

In this example the reference location specifed by the RT Device Distance Reference Location Code Sequence (300A,0659) has the​ value (130358, DCM, "Nominal Radiation Source Location").​

- Standard -​

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