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Page 766​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Total Reference Air Kerma​

(300A,0250)​

1​ Total Reference Air Kerma for current Application Setup, i.e., the​

 

 

 

product of Air Kerma Rate of all Sources in all Channels with their​

 

 

 

respective Channel Times (µGy at 1 m). Value shall be zero for​

 

 

 

non-gamma sources.​

>Brachy Accessory Device​

(300A,0260)​

3​ Sequence of Brachy Accessory Devices associated with current​

Sequence​

 

 

Application Setup.​

 

 

 

One or more Items are permitted in this Sequence.​

>>Brachy Accessory Device​

(300A,0262)​

2​ Identification number of the Brachy Accessory Device. The value​

Number​

 

 

of Brachy Accessory Device Number (300A,0262) shall be unique​

 

 

 

within the Application Setup in which it is created.​

>>Brachy Accessory Device ID​

(300A,0263)​

2​ User or machine supplied identifier for Brachy Accessory Device.​

>>Brachy Accessory Device​

(300A,0264)​

1​ Type of Brachy Accessory Device.​

Type​

 

 

Defined Terms:​

 

 

 

 

 

 

SHIELD​

 

 

 

DILATATION​

 

 

 

MOLD​

 

 

 

PLAQUE​

 

 

 

FLAB​

>>Brachy Accessory Device​

(300A,0266)​

3​ User-defined name for Brachy Accessory Device.​

Name​

 

 

 

>>Material ID​

(300A,00E1)​

3​ User-supplied identifier for material of Brachy Accessory Device.​

 

 

 

See Note.​

>>Brachy Accessory Device​

(300A,026A)​

3​ Nominal thickness of Brachy Accessory Device (mm). See​

Nominal Thickness​

 

 

Section C.8.8.15.12.​

>>Brachy Accessory Device​

(300A,026C)​

3​ NominalTransmissionthroughBrachyAccessoryDevice(between​

Nominal Transmission​

 

 

0 and 1). See Section C.8.8.15.12.​

>>Referenced ROI Number​

(3006,0084)​

2​ UniquelyidentifiesROIrepresentingtheBrachyAccessoryspecified​

 

 

 

by ROI Number (3006,0022) in Structure Set ROI Sequence​

 

 

 

(3006,0020) in Structure Set Module within RT Structure Set​

 

 

 

referencedbyReferencedRTStructureSetSequence(300C,0060)​

 

 

 

in RT General Plan Module. See Section C.8.8.15.2.​

>Channel Sequence​

(300A,0280)​

1​ Sequence of Channels for current Application Setup.​

 

 

 

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

>>Channel Number​

(300A,0282)​

1​ IdentificationnumberoftheChannel.ThevalueofChannelNumber​

 

 

 

(300A,0282) shall be unique within the Application Setup in which​

 

 

 

it is created.​

>>Channel Length​

(300A,0284)​

2​ Length of Channel (mm). See Section C.8.8.15.3.​

>>Channel Total Time​

(300A,0286)​

1​ Total amount of time between first and final Control Points of the​

 

 

 

Brachy Control Point Sequence (300A,02D0) for current Channel​

 

 

 

(sec).ChannelTotalTimecalculationisbasedupontheReference​

 

 

 

Air Kerma Rate (300A,022A) of the Referenced Source Number​

 

 

 

(300C,000E).​

>>Source Movement Type​

(300A,0288)​

1​ Type of Source movement. See Section C.8.8.15.4.​

 

 

 

Defined Terms:​

STEPWISE​

FIXED​

OSCILLATING​

UNIDIRECTIONAL​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 767​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Number of Pulses​

(300A,028A)​

1C​

Number of Pulses per fraction for current Channel. Required if​

 

 

 

Brachy Treatment Type (300A,0202) is PDR.​

 

>>Pulse Repetition Interval​

(300A,028C)​

1C​

Pulse repetition interval (sec) for current Channel. Required if​

 

 

 

Brachy Treatment Type (300A,0202) is PDR.​

 

>>Source Applicator Number​

(300A,0290)​

3​

IdentificationnumberoftheSourceApplicator.ThevalueofSource​

 

 

 

ApplicatorNumber(300A,0290)shallbeuniquewithintheChannel​

 

 

 

in which it is created.​

 

>>Source Applicator ID​

(300A,0291)​

2C​

UserormachinesuppliedidentifierforSourceApplicator.Required​

 

 

 

if Source Applicator Number (300A,0290) is present.​

 

>>Source Applicator Type​

(300A,0292)​

1C​

Type of Source Applicator. Required if Source Applicator Number​

 

 

 

(300A,0290) is present.​

 

 

 

 

Defined Terms:​

 

 

 

 

FLEXIBLE​

 

 

 

 

RIGID​

 

>>Source Applicator Name​

(300A,0294)​

3​

User-defined name for Source Applicator.​

 

>>Source Applicator Length​

(300A,0296)​

1C​

LengthofSourceApplicator(mm),definedasthedistancebetween​

 

 

 

the connector of the applicator and the distal-most position of the​

 

 

 

source.​

 

 

 

 

Required if Source Applicator Number (300A,0290) is present.​

>>SourceApplicatorTipLength​

(300A,0274)​

2C​

Length of Source Applicator Tip (in mm), defined as the distance​

 

 

 

between the outer tip of the applicator and the center of the​

 

 

 

distal-most possible position of the source.​

 

 

 

 

Required if Channel Effective Length (300A,0271) is present.​

 

 

 

See Section C.8.8.15.16.​

 

>>Source Applicator​

(300A,0298)​

3​

Manufacturer of Source Applicator.​

 

Manufacturer​

 

 

 

 

>>Material ID​

(300A,00E1)​

3​

User-supplied identifier for material of Source Applicator wall. See​

 

 

 

Note.​

 

>>Source Applicator Wall​

(300A,029C)​

3​

Nominal Thickness of Source Applicator wall (mm). See​

Nominal Thickness​

 

 

Section C.8.8.15.12.​

 

>>Source Applicator Wall​

(300A,029E)​

3​

Nominal Transmission through Source Applicator wall (between 0​

Nominal Transmission​

 

 

and 1). See Section C.8.8.15.12.​

 

>>Source Applicator Step Size​

(300A,02A0)​

1C​

Distanceofpathalongchannel(inmm)betweenadjacent(potential)​

 

 

 

dwell positions. Required if Source Movement Type (300A,0288)​

 

 

 

is STEPWISE.​

 

>>Referenced ROI Number​

(3006,0084)​

2C​

UniquelyidentifiesROIrepresentingtheSourceApplicatorspecified​

 

 

 

by ROI Number (3006,0022) in Structure Set ROI Sequence​

 

 

 

(3006,0020) in Structure Set Module within RT Structure Set​

 

 

 

referencedbyReferencedRTStructureSetSequence(300C,0060)​

 

 

 

inRTGeneralPlanModule.RequiredifSourceApplicatorNumber​

 

 

 

(300A,0290) is present. See Section C.8.8.15.2.​

 

>>Transfer Tube Number​

(300A,02A2)​

2​

Identification number of the Transfer Tube. The value of Transfer​

 

 

 

Tube Number (300A,02A2) shall be unique within the Channel in​

 

 

 

which it is created.​

 

>>Transfer Tube Length​

(300A,02A4)​

2C​

Length of Transfer Tube of current afterloading Channel (mm).​

 

 

 

Required if value Transfer Tube Number (300A,02A2) is non-null.​

- Standard -​

Page 768​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>>Channel Effective Length​

(300A,0271)​

3​

Length of Channel (in mm) defined as the distance between the​

 

 

 

connector on the afterloader and the center of the distal-most​

 

 

 

possible position of the source.​

 

 

 

See Section C.8.8.15.16.​

>>Channel Inner Length​

(300A,0272)​

2C​

The total physical inner length of channel (in mm). Specifies the​

 

 

 

distance between the connector on the afterloader and the end of​

 

 

 

the channel.​

 

 

 

Required if Channel Effective Length (300A,0271) is present.​

 

 

 

See Section C.8.8.15.16.1.​

>>Afterloader Channel ID​

(300A,0273)​

3​

Identification of the Channel connection on the afterloader.​

 

 

 

See Section C.8.8.15.16.2.​

>>Channel Shield Sequence​

(300A,02B0)​

3​

Sequence of Channel Shields associated with current Channel.​

 

 

 

One or more Items are permitted in this Sequence.​

 

 

 

See Section C.8.8.15.5.​

>>>Channel Shield Number​

(300A,02B2)​

1​

Identification number of the Channel Shield. The value of Channel​

 

 

 

Shield Number (300A,02B2) shall be unique within the Channel in​

 

 

 

which it is created.​

>>>Channel Shield ID​

(300A,02B3)​

2​

User or machine supplied identifier for Channel Shield.​

>>>Channel Shield Name​

(300A,02B4)​

3​

User-defined name for Channel Shield.​

>>>Material ID​

(300A,00E1)​

3​

User-supplied identifier for material of Channel Shield. See Note.​

>>>Channel Shield Nominal​

(300A,02B8)​

3​

Nominal Thickness of Channel Shield (mm). See​

Thickness​

 

 

Section C.8.8.15.12.​

>>>Channel Shield Nominal​

(300A,02BA)​

3​

Nominal Transmission of Channel Shield (between 0 and 1). See​

Transmission​

 

 

Section C.8.8.15.12.​

>>>Referenced ROI Number​

(3006,0084)​

2​

Uniquely identifies ROI representing the Channel Shield specified​

 

 

 

by ROI Number (3006,0022) in Structure Set ROI Sequence​

 

 

 

(3006,0020) in Structure Set Module within RT Structure Set​

 

 

 

referencedbyReferencedRTStructureSetSequence(300C,0060)​

 

 

 

in RT General Plan Module. See Section C.8.8.15.2.​

>>Referenced Source Number​

(300C,000E)​

1​

UniquelyidentifiesthereferencedSourcewithinSourceSequence​

 

 

 

(300A,0210) for current Application Setup.​

>>Number of Control Points​

(300A,0110)​

1​

Number of control points in Channel. For an N-segment Channel​

 

 

 

there will be 2N (stepwise movement) or N+1 (continuous​

 

 

 

movement) control points.​

>>Final Cumulative Time​

(300A,02C8)​

1C​

Value of Cumulative Time Weight (300A,02D6) for final Control​

Weight​

 

 

Point in Brachy Control Point Sequence (300A,02D0). Required if​

 

 

 

CumulativeTimeWeight(300A,02D6)isnon-nullinControlPoints​

 

 

 

specifiedwithinBrachyControlPointSequence(300A,02D0).See​

 

 

 

Section C.8.8.15.6.​

>>Brachy Control Point​

(300A,02D0)​

1​

Sequence of machine configurations describing this Channel.​

Sequence​

 

 

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

 

 

 

 

 

 

Number of Control Points (300A,0110).​

 

 

 

See Section C.8.8.15.7.​

>>>Control Point Index​

(300A,0112)​

1​

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

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 769​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>>Cumulative Time Weight​

(300A,02D6)​

2​ Cumulative time weight to current Control Point (where the​

 

 

 

weighting is proportional to time values delivered). Cumulative​

 

 

 

Time Weight for first Item in Brachy Control Point Sequence​

 

 

 

(300A,02D0) is always zero. See Section C.8.8.15.6 and​

 

 

 

Section C.8.8.15.8.​

 

>>>Control Point Relative​

(300A,02D2)​

1​ Distance between current Control Point Position and the center of​

Position​

 

 

the distal-most possible Source position in current Channel (mm).​

 

 

 

See Section C.8.8.15.9.​

 

>>>Control Point 3D Position​

(300A,02D4)​

3​ Coordinates (x, y, z) of Control Point in the Patient-Based​

 

 

 

Coordinate System described in Section C.7.6.2.1.1 (mm). See​

 

 

 

Section C.8.8.15.10.​

 

>>>Control Point Orientation​

(300A,0412)​

3​ (x,y,z) component of the direction vector of the brachy source or​

 

 

 

seed at the Control Point 3D Position (300A,02D4). See​

 

 

 

Section C.8.8.15.14.​

 

>>>Brachy Referenced Dose​

(300C,0055)​

3​ A Sequence of Dose References for current Channel.​

 

Reference Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

 

 

>>>>Referenced Dose​

(300C,0051)​

1​ Uniquely identifies Dose Reference described in Dose Reference​

Reference Number​

 

 

Sequence. (300A,0010) within RT Prescription Module of current​

 

 

 

RT Plan.​

 

>>>>Cumulative Dose​

(300A,010C)​

1​ Coefficientusedtocalculatecumulativedosecontributionfromthis​

Reference Coefficient​

 

 

Source to the referenced Dose Reference at the current Control​

 

 

 

Point. See Section C.8.8.15.11.​

 

Note​

Material ID (300A,00E1) may also be specified within a referenced ROI, if an ROI is used to describe the object.​

C.8.8.15.1 Permanent Implants​

In permanent implant techniques the value for Channel Total Time (300A,0286) shall be mean life time of the isotope. The Brachy​ Control Point Sequence (300A,02D0) shall consist of two Items: the first having Cumulative Time Weight (300A,02D6) = 0 and the​ second having Cumulative Time Weight (300A,02D6) = Final Cumulative Time Weight (300A,02C8).​

C.8.8.15.2 Referenced ROI Number​

TheStructureSetROIshallbeusedintheRTBrachyApplicationSetupsModuletodescribethe3DcoordinatesofAccessoryDevices,​ Applicators and Channel Shields, but not individual source positions (see Section C.8.8.15.9 and Section C.8.8.15.10).​

C.8.8.15.3 Channel Length​

If specified, Channel Length (300A,0284) shall be the sum of the Source Applicator Length (300A,0296) and Transfer Tube Length​ (300A,02A4).​

C.8.8.15.4 Oscillating Source Movement​

In brachytherapy treatment techniques involving oscillating source movement (i.e., when Source Movement Type (300A,0288) is​ OSCILLATING), the Brachy Control Point Sequence (300A,02D0) shall consist of two Items. The first Control Point shall have Cumu-​ lative Time Weight (300A,02D6) = 0, and Control Point Relative Position (300A,02D2) equal to one end point of the oscillation. The​ second Control Point shall have Cumulative Time Weight (300A,02D6) = Final Cumulative Time Weight (300A,02C8), and Control​ Point Relative Position (300A,02D2) equal to the other end point of the oscillation. Transit time shall not be modeled explicitly for os-​ cillating techniques.​

C.8.8.15.5 Channel Shields​

The effect of Channel Shields on dose contributions shall be specific to the Channel for which they are specified. There shall be no​ effect of these shields on the dose contributions from any other Channels.​

- Standard -​

Page 770​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.8.15.6 Time Calculations​

ThetreatmenttimeatagivenControlPointisequaltotheChannelTotalTime(300A,0286),multipliedbytheCumulativeTimeWeight​ (300A,02D6) for the Control Point, divided by the Final Cumulative Time Weight (300A,02C8). If the calculation for treatment time​ results in a time value that is not an exact multiple of the timer resolution, then the result shall be rounded to the nearest allowed timer​ value (i.e., less than a half resolution unit shall be rounded down to the nearest resolution unit, and equal or greater than half a resol-​ ution unit shall be rounded up to the nearest resolution unit).​

Note also that if Final Cumulative Time Weight (300A,02C8) is equal to 100, then Cumulative Time Weight (300A,02D6) becomes​ equivalent to the percentage of Channel Total Time (300A,0286) delivered at each control point. If Final Cumulative Time Weight​ (300A,02C8)isequaltoChannelTotalTime(300A,0286),thentheCumulativeTimeWeight(300A,02D6)ateachcontrolpointbecomes​ equal to the cumulative treatment time delivered at that control point.​

If Treatment Type (300A,0202) is PDR, then the Channel Total Time (3008,0286) shall specify the duration of a single pulse.​

C.8.8.15.7 Brachy Control Point Sequence​

The Control Points shall be arranged such that the first Control Point for a particular Channel describes the first dwell position and​ the final Control Point for the Channel describes the final dwell position. If Brachy Treatment Type (300A,0202) is PDR, the Brachy​ Control Point Sequence (300A,02D0) shall specify the sequence of machine configurations for a single pulse. Similarly, if Source​ MovementType(300A,0288)isOSCILLATING,theBrachyControlPointSequence(300A,02D0)shallspecifythesequenceofmachine​ configurations for a single period.​

Some examples of Brachytherapy specification using control points are as follows:​

a) Stepwise motion; Four equally weighted dwell positions; Step size = 10; Final Cumulative Time Weight = 100:​

Control Point 0: Control Point Relative Position = 30, Cumulative Time Weight = 0​

Control Point 1: Control Point Relative Position = 30, Cumulative Time Weight = 25​

Control Point 2: Control Point Relative Position = 20, Cumulative Time Weight = 25​

Control Point 3: Control Point Relative Position = 20, Cumulative Time Weight = 50​

Control Point 4: Control Point Relative Position = 10, Cumulative Time Weight = 50​

Control Point 5: Control Point Relative Position = 10, Cumulative Time Weight = 75​

Control Point 6: Control Point Relative Position = 0, Cumulative Time Weight = 75​

Control Point 7: Control Point Relative Position = 0, Cumulative Time Weight = 100​

b) Fixed (manually placed) sources; Final Cumulative Time Weight = 100:​

Control Point 0: Control Point Relative Position = 0, Control Point 3D Position = (x,y,z), Cumulative Time Weight = 0​

Control Point 1: Control Point Relative Position = 0, Control Point 3D Position = (x,y,z), Cumulative Time Weight = 100​

c) Oscillating movement; Final Cumulative Time Weight = 100:​

Control Point 0: Control Point Relative Position = 100, Cumulative Time Weight = 0​

Control Point 1: Control Point Relative Position = 0, Cumulative Time Weight = 100​

d) Unidirectional movement; Final Cumulative Time Weight = 100:​

Control Point 0: Control Point Relative Position = 0, Cumulative Time Weight = 0​

Control Point 1: Control Point Relative Position = 100, Cumulative Time Weight = 100​

e) Stepwise motion with consideration of source transit times between dwell positions; Three equally weighted dwell positions; Step​ size = 10; Final Cumulative Time Weight = 79:​

- Standard -​

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