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DICOM PS3.3 2020a - Information Object Definitions​

Page 741​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>RepeatFractionCycleLength​

(300A,007A)​

3​

Number of weeks needed to describe treatment pattern. See Note 2.​

>Fraction Pattern​

(300A,007B)​

3​

String of 0's (no treatment) and 1's (treatment) describing treatment​

 

 

 

pattern. Length of string is 7 x Number of Fraction Pattern Digits Per​

 

 

 

Day x Repeat Fraction Cycle Length. Pattern shall start on a Monday.​

 

 

 

See Note 2.​

 

>Beam Dose Meaning​

(300A,008B)​

3​

Indicates the meaning of Beam Dose (300A,0084).​

 

 

 

 

Enumerated Values:​

 

 

 

 

BEAM_LEVEL​ Beam Dose value is individually calculated for​

 

 

 

this Beam​

 

 

 

 

FRACTION_LEVEL​Dose is calculated on the Fraction level, and the​

 

 

 

value of Beam Dose (300A,0084) is assigned to​

 

 

 

the Beam to carry a nominally distributed dose​

 

 

 

only.​

 

>Number of Beams​

(300A,0080)​

1​

Number of Beams in current Fraction Group. If Number of Beams is​

 

 

 

greater then zero, Number of Brachy Application Setups (300A,00A0)​

 

 

 

shall equal zero.​

 

>ReferencedBeamSequence​

(300C,0004)​

1C​

Sequence of treatment beams in current Fraction Group.​

 

 

 

 

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

 

 

 

 

Required if Number of Beams (300A,0080) is greater than zero.​

>>Referenced Beam Number​

(300C,0006)​

1​

Uniquely identifies Beam specified by Beam Number (300A,00C0)​

 

 

 

within Beam Sequence (300A,00B0) in RT Beams Module or within​

 

 

 

Ion Beam Sequence (300A,03A2) in RT Ion Beams Module.​

>>ReferencedDoseReference​

(300A,0083)​

3​

Identifies the Dose Reference specified by Dose Reference UID​

UID​

 

 

(300A,0013) in the Dose Reference Sequence (300A,0010) in the RT​

 

 

 

Prescription Module which specifies the primary target for the current​

 

 

 

Beam.​

 

 

 

 

If present shall have a value that is present in the Dose Reference​

 

 

 

Sequence.​

 

>>Beam Dose​

(300A,0084)​

3​

Dose (in Gy) due to current Beam for one treatment fraction.​

 

 

 

See Note 9.​

 

>>Beam Dose Type​

(300A,0090)​

1C​

Type of Dose of the Beam Dose (300A,0084).​

 

 

 

 

Enumerated Values:​

 

 

 

 

PHYSICAL​

 

 

 

 

EFFECTIVE​

 

 

 

 

Shall not have the same value as Alternate Beam Dose Type​

 

 

 

(300A,0092).​

 

 

 

 

Required if Alternate Beam Dose (300A,0091) is present. May be​

 

 

 

present otherwise.​

 

>>Alternate Beam Dose​

(300A,0091)​

3​

Alternate Dose (in Gy) according to the Alternate Beam Dose Type​

 

 

 

(300A,0092).​

 

See Note 9.​

- Standard -​

Page 742​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>>Alternate Beam Dose Type​

(300A,0092)​

1C​

Type of Dose of the Alternate Beam Dose (300A,0091).​

 

 

 

Enumerated Values:​

 

 

 

PHYSICAL​

 

 

 

EFFECTIVE​

 

 

 

Shall not have the same value as Beam Dose Type (300A,0090).​

 

 

 

Required if Alternate Beam Dose (300A,0091) is present.​

>>Beam Meterset​

(300A,0086)​

3​

Machine setting to be delivered for current Beam, specified in Monitor​

 

 

 

Units (MU) or minutes as defined by Primary Dosimeter Unit​

 

 

 

(300A,00B3) (in RT Beams Module) for referenced Beam. See Note​

 

 

 

4.​

>>Beam Delivery Duration​

(300A,00C5)​

3​

The expected maximum delivery time in sec. See Note 7.​

Limit​

 

 

 

>NumberofBrachyApplication​

(300A,00A0)​

1​

Number of Brachy Application Setups in current Fraction Group. If​

Setups​

 

 

Number of Brachy Application Setups is greater then zero, Number​

 

 

 

of Beams (300A,0080) shall equal zero.​

>Referenced Brachy​

(300C,000A)​

1C​

Sequence of treatment Brachy Application Setups in current Fraction​

Application Setup Sequence​

 

 

Group.RequiredifNumberofBrachyApplicationSetups(300A,00A0)​

 

 

 

is greater than zero. One or more Items shall be included in this​

 

 

 

Sequence.​

>>Referenced Brachy​

(300C,000C)​

1​

Uniquely identifies Brachy Application Setup specified by Brachy​

Application Setup Number​

 

 

Application Setup Number (300A,0234) within Brachy Application​

 

 

 

SetupSequence(300A,0230)inRTBrachyApplicationSetupsModule.​

>>Brachy Application Setup​

(300A,00A2)​

3​

Coordinates (x,y,z) of point in the Patient-Based Coordinate System​

Dose Specification Point​

 

 

described in Section C.7.6.2.1.1 at which Brachy Application Setup​

 

 

 

Dose (300A,00A4) is specified (mm).​

>>Brachy Application Setup​

(300A,00A4)​

3​

Dose (in Gy) at Brachy Application Setup Dose Specification Point​

Dose​

 

 

(300A,00A2) due to current Brachy Application Setup.​

Note​

1.​An RT Dose IOD referenced within the Referenced Dose Sequence (300C,0080) can be used for storing grid-based​ (pixel) data, isodose curves, and/or individual dose points (with optional dose point names) for the current Fraction​ Group.​

2.​The fractionation pattern does not indicate the actual start of treatment, or the order or timing of fraction delivery. If​ treatment does not commence as outlined in the pattern, it is the application's responsibility to make any necessary​ adjustments.​

Examples of Fractionation Pattern Schemes:​

a.​1 fraction group, 1 fraction per day (Monday to Friday):​

•​Number of Fraction Pattern Digits per Day = 1, Repeat Fraction Cycle Length = 1, Fraction Pattern = 1111100​

b.​2 fraction groups, 1 fraction per day, first fraction group Monday, Wednesday, and Friday, second fraction group​ Tuesday and Thursday:​

•​Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length = 1, Fraction​ Pattern = 1010100​

•​Fraction Group 2: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length = 1, Fraction​ Pattern = 0101000​

c.​2 fraction groups, 1 fraction per day, alternating fraction groups every day of treatment (Monday to Friday):​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 743​

•​Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length = 2, Fraction​ Pattern = 10101000101000​

•​Fraction Group 2: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length = 2, Fraction​ Pattern = 01010001010100​

d.​1 fraction group, 2 fractions per day (Monday to Friday):​

•​Fraction Group 1: Number of Fraction Pattern Digits Per Day = 2, Repeat Fraction Cycle Length = 1, Fraction​ Pattern = 11111111110000​

e.​2 fraction groups, 2 fractions per day, alternating fraction groups every treatment (Monday to Friday):​

•​Fraction Group 1: Number of Fraction Pattern Digits Per Day = 1, Repeat Fraction Cycle Length = 1, Fraction​ Pattern = 1111100​

•​Fraction Group 2: Number of Fraction Pattern Digits Per Day = 2, Repeat Fraction Cycle Length = 1, Fraction​ Pattern = 11111111110000​

3.​The Brachy Application Setup Dose Specification Point (300A,00A2) contains the coordinates of the single point used​ for dose normalization. This point is distinct from the Brachy Referenced Dose Reference Sequence (300C,0055) in​ the RT Brachy Application Setups Module, which are used for plan evaluation and dose tracking.​

4.​The Meterset at a given Control Point (see RT Beams Module) is equal to Beam Meterset (300A,0086) multiplied by​ the Cumulative Meterset Weight (300A,0134) for the Control Point, divided by the Final Cumulative Meterset Weight​ (300A,010E).​

5.​Attribute Referenced Patient Setup Number (300C,006A) was previously defined. Its use in this Module is now retired​ (see PS3.3-2004).​

6.​Attributes Beam Dose Point Depth, Beam Dose Point Equivalent Depth and Beam Dose Point SSD were previously​ included in this Module as optional Attributes but have been retired. See PS3.3-2011.​

7.​The Beam Delivery Duration Limit (300A,00C5) is the maximum time span allowed to deliver a single fraction of a beam​ topreventsignificantover-treatments.TreatmentisexpectedtobeterminateduponreachingtheBeamDeliveryDuration​ Limit independent of the Meterset. This limit represents the expected time span including some increase by a factor​ greater than 1 to accommodate normal variations in delivery.​

8.​The Beam Dose Verification Control Point Sequence was previously included and has been retired. See PS 3.3 2017c.​ The information is now described in the Referenced Dose Reference Sequence (300C,0050) in the Section C.8.8.14​ RT Beams Module.​

9.​The Beam Dose Specification Point (300A,0082) was previously included in this module as a means to specify a single​ point at which dose contributions of different beams could be specified. This attribute has been retired as it no longer​ reflects clinical practice. Along with this, the semantics of the Beam Dose (300A,0084) and Alternate Beam Dose​ (300A,0091) have been adapted to reflect the absence of the Beam Dose Specification Point. In order to refer to an​ Item in the Dose Reference Sequence (300A,0010) it is recommended to utilize the Referenced Dose Reference UID​ (300A,0083) and the Dose Reference UID (300A,0013) respectively.​

C.8.8.13.1 Beam Dose Verification Parameters​

Retired. See PS3.3 2017c.​

C.8.8.14 RT Beams Module​

The RT Beams Module contains information defining equipment parameters for delivery of external radiation beams.​

- Standard -​

Page 744​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-50. RT Beams Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Beam Sequence​

(300A,00B0)​

1​

Sequence of treatment beams for current RT Plan.​

 

 

 

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

>Beam Number​

(300A,00C0)​

1​

Identification number of the Beam. The value of Beam Number​

 

 

 

(300A,00C0) shall be unique within the RT Plan in which it is created.​

 

 

 

See Note 1.​

>Beam Name​

(300A,00C2)​

3​

User-defined name for Beam. See Note 1.​

>Beam Description​

(300A,00C3)​

3​

User-defined description for Beam. See Note 1.​

>Beam Type​

(300A,00C4)​

1​

Motion characteristic of Beam. See Note 5.​

 

 

 

Enumerated Values:​

 

 

 

STATIC​ All Control Point Sequence (300A,0111) Attributes remain​

 

 

 

unchanged between consecutive pairs of control points with​

 

 

 

changing Cumulative Meterset Weight (300A,0134).​

 

 

 

DYNAMIC​One or more Control Point Sequence (300A,0111) Attributes​

 

 

 

change between one or more consecutive pairs of control​

 

 

 

points with changing Cumulative Meterset Weight​

 

 

 

(300A,0134).​

>Radiation Type​

(300A,00C6)​

2​

Particle type of Beam.​

 

 

 

Defined Terms:​

 

 

 

PHOTON​

 

 

 

ELECTRON​

 

 

 

NEUTRON​

 

 

 

PROTON​

>Primary Fluence Mode​

(3002,0050)​

3​

Sequence defining whether the primary fluence of the treatment beam​

Sequence​

 

 

uses a non-standard fluence-shaping.​

 

 

 

Only a single Item is permitted in this Sequence.​

>>Fluence Mode​

(3002,0051)​

1​

Describeswhetherthefluenceshapingisthestandardmodeforthebeam​

 

 

 

or an alternate.​

 

 

 

Enumerated Values:​

 

 

 

STANDARD​ Uses standard fluence-shaping​

 

 

 

NON_STANDARD​Uses a non-standard fluence-shaping mode​

>>Fluence Mode ID​

(3002,0052)​

1C​

Identifier for the specific fluence-shaping mode.​

 

 

 

Required if Fluence Mode (3002,0051) has value NON_STANDARD.​

>High-DoseTechniqueType​

(300A,00C7)​

1C​

Type of high-dose treatment technique.​

 

 

 

Defined Terms:​

 

 

 

TBI​Total Body Irradiation​

 

 

 

HDR​High Dose Rate​

 

 

 

Required if treatment technique requires a dose that would normally​

 

 

 

require overriding of treatment machine safety controls.​

>Treatment Machine Name​

(300A,00B2)​

2​

User-defined name identifying treatment machine to be used for beam​

 

 

 

delivery. See Note 2.​

>Manufacturer​

(0008,0070)​

3​

Manufacturer of the equipment to be used for beam delivery.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 745​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

>Institution Name​

(0008,0080)​

3​

Institution where the equipment is located that is to be used for beam​

 

 

 

delivery.​

 

>Institution Address​

(0008,0081)​

3​

Mailing address of the institution where the equipment is located that is​

 

 

 

to be used for beam delivery.​

 

>Institutional Department​

(0008,1040)​

3​

Department in the institution where the equipment is located that is to be​

Name​

 

 

used for beam delivery.​

 

>Institutional Department​

(0008,1041)​

3​

A coded description of the type of Department or Service within the​

Type Code Sequence​

 

 

healthcare facility.​

 

 

 

 

Only a single Item is permitted in this Sequence.​

 

>>Include Table 8.8-1 “Code Sequence Macro Attributes”​BCID 7030 “Institutional Departments, Units and Services”.​

 

>Manufacturer's Model​

(0008,1090)​

3​

Manufacturer's model name of the equipment that is to be used for beam​

Name​

 

 

delivery.​

 

>Device Serial Number​

(0018,1000)​

3​

Manufacturer'sserialnumberoftheequipmentthatistobeusedforbeam​

 

 

 

delivery.​

 

>Primary Dosimeter Unit​

(300A,00B3)​

3​

Measurement unit of machine dosimeter.​

 

 

 

 

See Section C.8.8.14.1.​

 

 

 

 

Enumerated Values:​

 

 

 

 

MU​

Monitor Unit​

 

 

 

 

MINUTE​minute​

 

>Referenced Tolerance​

(300C,00A0)​

3​

UniquelyidentifiesToleranceTablespecifiedbyToleranceTableNumber​

Table Number​

 

 

(300A,0042) within Tolerance Table Sequence in RT Tolerance Tables​

 

 

 

Module. These tolerances are to be used for verification of treatment​

 

 

 

machine settings.​

 

>Source-Axis Distance​

(300A,00B4)​

3​

Radiation source to Gantry rotation axis distance of the equipment that​

 

 

 

is to be used for beam delivery (mm).​

 

>Beam Limiting Device​

(300A,00B6)​

1​

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

Sequence​

 

 

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

 

 

 

 

 

>>RTBeamLimitingDevice​

(300A,00B8)​

1​

Type of beam limiting device (collimator).​

 

Type​

 

 

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​

 

>>Source to Beam Limiting​

(300A,00BA)​

3​

Radiation source to beam limiting device (collimator) distance of the​

Device Distance​

 

 

equipment that is to be used for beam delivery (mm).​

 

>>NumberofLeaf/JawPairs​

(300A,00BC)​

1​

Number of leaf (element) or jaw pairs (equal to 1 for standard beam​

 

 

 

limiting device jaws).​

 

>>Leaf Position Boundaries​

(300A,00BE)​

2C​

Boundaries of beam limiting device (collimator) leaves (in mm) in IEC​

 

 

 

BEAMLIMITINGDEVICEcoordinateaxisappropriatetoRTBeamLimiting​

 

 

 

Device Type (300A,00B8), i.e., X-axis for MLCY, Y-axis for MLCX.​

 

 

 

Contains N+1 values, where N is the Number of Leaf/Jaw Pairs​

 

 

 

(300A,00BC), starting from Leaf (Element) Pair 1. Required if RT Beam​

 

 

 

Limiting Device Type (300A,00B8) is MLCX or MLCY. May be present​

 

 

 

otherwise. See Note 3.​

 

- Standard -​

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