DICOM Standard Browser

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(300A,0200) Brachy Treatment Technique1Code String
(300A,0202) Brachy Treatment Type1Code String
(300A,0206) Treatment Machine Sequence1Sequence
(300A,0210) Source Sequence1Sequence
(300A,0230) Application Setup Sequence1Sequence
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(3006,0084) Referenced ROI Number2CInteger String
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(300A,0110) Number of Control Points1Integer String
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(300A,0273) Afterloader Channel ID3Short String
(300A,0274) Source Applicator Tip Length2CDecimal String
(300A,0282) Channel Number1Integer String
(300A,0284) Channel Length2Decimal String
(300A,0286) Channel Total Time1Decimal String
(300A,0288) Source Movement Type1Code String
(300A,028A) Number of Pulses1CInteger String
(300A,028C) Pulse Repetition Interval1CDecimal String
(300A,0290) Source Applicator Number3Integer String
(300A,0291) Source Applicator ID2CShort String
(300A,0292) Source Applicator Type1CCode String
(300A,0294) Source Applicator Name3Long String
(300A,0296) Source Applicator Length1CDecimal String
(300A,0298) Source Applicator Manufacturer3Long String
(300A,029C) Source Applicator Wall Nominal Thickness3Decimal String
(300A,029E) Source Applicator Wall Nominal Transmission3Decimal String
(300A,02A0) Source Applicator Step Size1CDecimal String
(300A,02A1) Applicator Shape Referenced ROI Number3Integer String
(300A,02A2) Transfer Tube Number2Integer String
(300A,02A4) Transfer Tube Length2CDecimal String
(300A,02B0) Channel Shield Sequence3Sequence
(300A,02C8) Final Cumulative Time Weight1CDecimal String
(300A,02D0) Brachy Control Point Sequence1Sequence
(300A,0112) Control Point Index1Integer String
(300A,02D2) Control Point Relative Position1Decimal String
(300A,02D4) Control Point 3D Position3Decimal String
(300A,02D6) Cumulative Time Weight2Decimal String
(300A,0412) Control Point Orientation3Single
(300C,0055) Brachy Referenced Dose Reference Sequence3Sequence
(300C,000E) Referenced Source Number1Integer String
(300C,0042) Referenced Reference Image Sequence3Sequence
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Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Cumulative Time Weight Attribute

Tag(300A,02D6)
TypeRequired, Empty if Unknown (2)
KeywordCumulativeTimeWeight
Value Multiplicity1
Value RepresentationDecimal String (DS)

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.

Section C.8.8.15.6

C.8.8.15.6 Time Calculations

The treatment time at a given Control Point is equal to the Channel Total Time (300A,0286), multiplied by the Cumulative Time Weight (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 resolution 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) is equal to Channel Total Time (300A,0286), then the Cumulative Time Weight (300A,02D6) at each control point becomes 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.

Section C.8.8.15.8

C.8.8.15.8 Source Transit Time

The Source transit times between dwell positions of a remote afterloader may be considered by specifying a non-zero increment in the Cumulative Time Weight (300A,02D6) when the Source moves between Control Points. In this case the Channel Total Time (300A,0286) shall include the overall Source transit time for the Channel.