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DICOM PS3.3 2020a - Information Object Definitions​

Page 751​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Block Transmission​

(300A,0102)​

2C​

Transmission through the block (between 0 and 1) at the beam energy​

 

 

 

specified by the Nominal Beam Energy (300A,0114) of the first Control​

 

 

 

Point of the Control Point Sequence (300A,0111). Required if Material​

 

 

 

ID(300A,00E1)iszerolength.MaybepresentifMaterialID(300A,00E1)​

 

 

 

is non-zero length. See Section C.8.8.14.4 and Section C.8.8.14.11.​

>>Block Number of Points​

(300A,0104)​

2​

Number of (x,y) pairs defining the block edge.​

 

>>Block Data​

(300A,0106)​

2​

A data stream of (x,y) pairs that comprise the block edge. The number​

 

 

 

of pairs shall be equal to Block Number of Points (300A,0104), and the​

 

 

 

vertices shall be interpreted as a closed polygon. Coordinates are​

 

 

 

projected onto the machine isocentric plane in the IEC BEAM LIMITING​

 

 

 

DEVICE coordinate system (mm). See Note 4.​

 

>Applicator Sequence​

(300A,0107)​

3​

Sequence of Applicators associated with Beam.​

 

 

 

 

Only a single Item is permitted in this Sequence.​

 

>>Applicator ID​

(300A,0108)​

1​

User or machine supplied identifier for Applicator.​

 

>>Accessory Code​

(300A,00F9)​

3​

An identifier for the accessory intended to be read by a device such as​

 

 

 

a bar-code reader.​

 

>>Applicator Type​

(300A,0109)​

1​

Type of Applicator.​

 

Defined Terms:​

ELECTRON_SQUARE​square electron applicator​

ELECTRON_RECT​ rectangular electron applicator​

ELECTRON_CIRC​ circular electron applicator​

ELECTRON_SHORT​short electron applicator​

ELECTRON_OPEN​open (dummy) electron applicator​

PHOTON_SQUARE​square photon applicator​

PHOTON_RECT​ rectangular photon applicator​

PHOTON_CIRC​ circular photon applicator​

INTRAOPERATIVE​ intraoperative (custom) applicator​

STEREOTACTIC​ stereotactic applicator (deprecated)​

>>Applicator Geometry​

(300A,0431)​

3​ Describes the applicator aperture geometry.​

Sequence​

 

Only a single Item is permitted in this Sequence.​

 

 

>>>Applicator Aperture​

(300A,0432)​

1​ Aperture shape of the applicator.​

Shape​

 

Defined Terms:​

 

 

SYM_SQUARE​ Asquare-shapedaperturesymmetricaltothecentral​ axis.​

SYM_RECTANGLE​A rectangular-shaped aperture symmetrical to the​ central axis.​

SYM_CIRCULAR​Acircular-shapedaperturesymmetricaltothecentral​ axis.​

>>>Applicator Opening​

(300A,0433)​

1C​

Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING​

 

 

 

DEVICEcoordinatesystem.Incaseofsquare-shapedapplicatorcontains​

 

 

 

the length of the sides of the square. In case of circular-shaped​

 

 

 

applicators, contains the diameter of the circular aperture.​

 

 

 

Required if Applicator Aperture Shape (300A,0432) is SYM_SQUARE or​

 

 

 

SYM_CIRCULAR.​

>>>Applicator Opening X​

(300A,0434)​

1C​

Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING​

 

 

 

DEVICE coordinate system in X-Direction.​

RequiredifApplicatorApertureShape(300A,0432)isSYM_RECTANGLE.​

- Standard -​

Page 752​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

>>>Applicator Opening Y​

(300A,0435)​

1C​

Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING​

 

 

 

DEVICE coordinate system in Y-Direction.​

 

 

 

RequiredifApplicatorApertureShape(300A,0432)isSYM_RECTANGLE.​

>> Source to Applicator​

(300A,0436)​

3​

Radiation source to applicator mounting position distance (in mm) for​

Mounting Position Distance​

 

 

current applicator.​

 

>>Applicator Description​

(300A,010A)​

3​

User-defined description for Applicator.​

>General Accessory​

(300A,0420)​

3​

A Sequence of General Accessories associated with this Beam.​

Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

>>General Accessory​

(300A,0424)​

1​

IdentificationNumberoftheGeneralAccessory.Thevalueshallbeunique​

Number​

 

 

within the Sequence.​

>>General Accessory ID​

(300A,0421)​

1​

User or machine supplied identifier for General Accessory.​

>>General Accessory​

(300A,0422)​

3​

User supplied description of General Accessory.​

Description​

 

 

 

 

>>General Accessory Type​

(300A,0423)​

3​

Specifies the type of accessory.​

 

 

 

Defined Terms:​

 

 

 

 

GRATICULE​

Accessory tray with a radio-opaque grid​

 

 

 

IMAGE_DETECTOR​Image acquisition device positioned in the beam​

 

 

 

 

line​

 

 

 

RETICLE​

Accessory tray with radio-transparent markers or​

 

 

 

 

grid​

>>Accessory Code​

(300A,00F9)​

3​

Machine-readable identifier for this accessory​

>>Source to General​

(300A,0425)​

3​

Radiation source to general accessory distance (in mm) for current​

Accessory Distance​

 

 

accessory.​

 

>Referenced Dose​

(300C,0050)​

3​

A Sequence of Dose References for which verification control points are​

Reference Sequence​

 

 

defined.​

 

 

 

 

One or more Items are permitted in this Sequence.​

>>Referenced Dose​

(300C,0051)​

1​

UniquelyidentifiesDoseReferencespecifiedbyDoseReferenceNumber​

Reference Number​

 

 

(300A,0012)inDoseReferenceSequence(300A,0010)inRTPrescription​

 

 

 

Module.​

 

>>Depth Value Averaging​

(300A,0093)​

1C​

Whether or not the depth values have been averaged.​

Flag​

 

 

Enumerated Values:​

 

 

 

 

 

 

YES​The values represent average values from the current Verification​

 

 

 

Control Point to the next​

 

 

 

NO​ The values refer to a single location​

 

 

 

Required if the referenced beam describes an angular movement and​

 

 

 

the depth values change during movement.​

>>Beam Dose Verification​

(300A,008C)​

1​

SequenceofItemscontainingBeamDoseCoordinateVerificationControl​

Control Point Sequence​

 

 

Points.​

 

 

 

 

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

>>>Cumulative Meterset​

(300A,0134)​

1​

The cumulative Meterset weight value, at which the beam dose point​

Weight​

 

 

geometrical parameters apply.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 753​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>>Referenced Control​

(300C,00F0)​

1C​

Uniquely identifies the Control Point specified by Control Point Index​

Point Index​

 

 

(300A,0112) within Beam referenced by Referenced Beam Number​

 

 

 

(300C,0006).​

 

 

 

 

See Section C.8.8.14.16.​

 

 

 

 

Required,iftheReferencedCumulativeMetersetcorrespondstoaControl​

 

 

 

Point in the Control Point Sequence (300A,0111).​

 

>>>BeamDosePointDepth​

(300A,0088)​

1C​

The depth (in mm) in the patient along a ray from the source to the dose​

 

 

 

point specified by the Dose Reference Point Coordinates (300A,0018) or​

 

 

 

the referenced ROI.​

 

 

 

 

Required for all but the last Item in this Sequence and for the last Item if​

 

 

 

Depth Value Averaging Flag (300A,0093) has a value of NO.​

 

 

 

See Note 6.​

 

>>>Beam Dose Point​

(300A,0089)​

1C​

The radiological depth in mm (water-equivalent depth, taking tissue​

Equivalent Depth​

 

 

heterogeneity into account) in the patient along a ray from the source to​

 

 

 

the dose point specified by the Dose Reference Point Coordinates​

 

 

 

(300A,0018) or the referenced ROI.​

 

 

 

 

Required for all but the last Item in this Sequence and for the last Item if​

 

 

 

Depth Value Averaging Flag (300A,0093) has a value of NO.​

 

 

 

See Note 6.​

 

>>>Beam Dose Point SSD​

(300A,008A)​

1C​

Source to patient surface (skin) distance in mm along a ray from the​

 

 

 

source to the dose point specified by the Dose Reference Point​

 

 

 

Coordinates (300A,0018) or the referenced ROI.​

 

 

 

 

Required for all but the last Item in this Sequence and for the last Item if​

 

 

 

Depth Value Averaging Flag (300A,0093) has a value of NO.​

 

 

 

See Note 6.​

 

>>>Beam Dose Point​

(300A,0094)​

3​

Source to External Contour distance in mm including devices associated​

Source to External Contour​

 

 

with the patient anatomy model along a ray from the source to the dose​

Distance​

 

 

point specified by the Dose Reference Point Coordinates (300A,0018) or​

 

 

 

the referenced ROI.​

 

 

 

 

May be present for all but the last Item in this Sequence and for the last​

 

 

 

Item if Depth Value Averaging Flag (300A,0093) has a value of NO.​

 

 

 

See Section C.8.8.14.15.​

 

>Final Cumulative Meterset​

(300A,010E)​

1C​

Value of Cumulative Meterset Weight (300A,0134) for final Control Point​

Weight​

 

 

inControlPointSequence(300A,0111).RequiredifCumulativeMeterset​

 

 

 

Weight is non-null in Control Points specified within Control Point​

 

 

 

Sequence (300A,0111). See Section C.8.8.14.1.​

 

>Number of Control Points​

(300A,0110)​

1​

Number of control points in Beam.​

 

 

 

 

Value shall be greater than or equal to 2.​

 

>Control Point Sequence​

(300A,0111)​

1​

Sequence of machine configurations describing treatment beam.​

 

 

 

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

 

 

 

of Control Points (300A,0110).​

 

 

 

 

See Section C.8.8.14.5 and Section C.8.8.14.6.​

 

>>Control Point Index​

(300A,0112)​

1​

Index of current Control Point, starting at 0 for first Control Point.​

- Standard -​

Page 754​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>>Cumulative Meterset​

(300A,0134)​

2​

Cumulative weight to current control point. Cumulative Meterset Weight​

Weight​

 

 

for the first Item in Control Point Sequence shall always be zero.​

 

 

 

Cumulative Meterset Weight for the final Item in Control Point Sequence​

 

 

 

shall always be equal to Final Cumulative Meterset Weight. See​

 

 

 

Section C.8.8.14.1.​

>>Referenced Dose​

(300C,0050)​

3​

A Sequence of Dose References for current Beam. One or more Items​

Reference Sequence​

 

 

are permitted in this Sequence.​

>>>Referenced Dose​

(300C,0051)​

1​

UniquelyidentifiesDoseReferencespecifiedbyDoseReferenceNumber​

Reference Number​

 

 

(300A,0012)inDoseReferenceSequence(300A,0010)inRTPrescription​

 

 

 

Module.​

>>>Cumulative Dose​

(300A,010C)​

2​

CoefficientusedtocalculatecumulativedosecontributionfromthisBeam​

Reference Coefficient​

 

 

to the referenced Dose Reference at the current Control Point. See​

 

 

 

Section C.8.8.14.7.​

>>Referenced Dose​

(300C,0080)​

1C​

Sequence describing related instances of RT Dose (for grids, isodose​

Sequence​

 

 

curves, and named/unnamed point doses).​

 

 

 

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

 

 

 

Required if RT Dose is being transmitted, and Dose Summation Type​

 

 

 

(3004,000A) equals CONTROL_POINT.​

>>>Include Table 10-11 “SOP Instance Reference Macro​

Attributes”​

 

 

 

>>Nominal Beam Energy​

(300A,0114)​

3​

Nominal Beam Energy at control point (MV/MeV).​

>>Dose Rate Set​

(300A,0115)​

3​

Dose Rate to be set on treatment machine for segment beginning at​

 

 

 

current control point (e.g., MU/min).​

>>Wedge Position​

(300A,0116)​

1C​

A Sequence of Items describing Wedge Positions for the current control​

Sequence​

 

 

point.​

 

 

 

Required for first Item of Control Point Sequence if Number of Wedges​

 

 

 

(300A,00D0) is non-zero, and in subsequent control points if Wedge​

 

 

 

Position (300A,0118) changes during Beam. See Section C.8.8.14.5.​

 

 

 

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

 

 

 

of Wedges (300A,00D0).​

>>>Referenced Wedge​

(300C,00C0)​

1​

Uniquely references Wedge described by Wedge Number (300A,00D2)​

Number​

 

 

in Wedge Sequence (300A,00D1).​

>>>Wedge Position​

(300A,0118)​

1​

Position of Wedge at current Control Point.​

 

 

 

Enumerated Values:​

 

 

 

IN​

 

 

 

OUT​

>>Beam Limiting Device​

(300A,011A)​

1C​

Sequence of beam limiting device (collimator) jaw or leaf (element)​

Position Sequence​

 

 

positions.​

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

Required for first Item of Control Point Sequence, or if Beam Limiting​

Device changes during Beam.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 755​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

>>>RT Beam Limiting​

(300A,00B8)​

1​

Type of beam limiting device (collimator). The value of this Attribute shall​

Device Type​

 

 

correspond to RT Beam Limiting Device Type (300A,00B8) defined in an​

 

 

 

Item of Beam Limiting Device Sequence (300A,00B6).​

 

 

 

 

Enumerated Values:​

 

 

 

 

X​

symmetric jaw pair in IEC X direction​

 

 

 

 

Y​

symmetric jaw pair in IEC Y direction​

 

 

 

 

ASYMX​asymmetric jaw pair in IEC X direction​

 

 

 

 

ASYMY​asymmetric pair in IEC Y direction​

 

 

 

 

MLCX​multileaf (multi-element) jaw pair in IEC X direction​

 

 

 

 

MLCY​multileaf (multi-element) jaw pair in IEC Y direction​

 

>>>Leaf/Jaw Positions​

(300A,011C)​

1​

Positions of beam limiting device (collimator) leaf (element) or jaw pairs​

 

 

 

(in mm) in IEC BEAM LIMITING DEVICE coordinate axis appropriate to​

 

 

 

RT Beam Limiting Device Type (300A,00B8), e.g., X-axis for MLCX,​

 

 

 

Y-axisforMLCY.Contains2Nvalues,whereNistheNumberofLeaf/Jaw​

 

 

 

Pairs (300A,00BC) in Beam Limiting Device Sequence (300A,00B6).​

 

 

 

Values shall be listed in IEC leaf (element) subscript order 101, 102, …​

 

 

 

1N, 201, 202, … 2N. See Note 3.​

 

>>Gantry Angle​

(300A,011E)​

1C​

Gantry angle of radiation source, i.e., orientation of IEC GANTRY​

 

 

 

coordinate system with respect to IEC FIXED REFERENCE coordinate​

 

 

 

system (degrees). Required for first Item of Control Point Sequence, or​

 

 

 

if Gantry Angle changes during Beam.​

 

 

 

 

See Section C.8.8.14.13.​

 

>>GantryRotationDirection​

(300A,011F)​

1C​

Direction of Gantry Rotation when viewing gantry from isocenter, for​

 

 

 

segment following Control Point. Required for first Item of Control Point​

 

 

 

Sequence, or if Gantry Rotation Direction changes during Beam. See​

 

 

 

Section C.8.8.14.8.​

 

 

 

 

Enumerated Values:​

 

 

 

 

CW​ clockwise​

 

 

 

 

CC​

counter-clockwise​

 

 

 

 

NONE​no rotation​

 

>>Gantry Pitch Angle​

(300A,014A)​

3​

Gantry Pitch Angle. i.e., the rotation of the IEC GANTRY coordinate​

 

 

 

systemabouttheX-axisoftheIECGANTRYcoordinatesystem(degrees).​

 

 

 

If used, must be present for first Item of Control Point Sequence, or if​

 

 

 

used and Gantry Pitch Rotation Angle changes during Beam, must be​

 

 

 

present. See Section C.8.8.25.6.5.​

 

 

 

 

See Section C.8.8.14.13.​

 

>>Gantry Pitch Rotation​

(300A,014C)​

3​

Direction of Gantry Pitch Angle when viewing along the positive X-axis​

Direction​

 

 

of the IEC GANTRY coordinate system, for segment following Control​

 

 

 

Point. If used, must be present for first Item of Control Point Sequence,​

 

 

 

or if used and Gantry Pitch Rotation Direction changes during Beam,​

 

 

 

must be present. See Section C.8.8.14.8 and Section C.8.8.25.6.5.​

 

 

 

Enumerated Values:​

 

 

 

 

CW​ clockwise​

 

 

 

 

CC​

counter-clockwise​

 

 

 

 

NONE​no rotation​

 

- Standard -​

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