C.8.8.22.2 Specified Channel Total Time

C.8.8.22.2 Specified Channel Total Time (Current)
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Total time is derived from the Brachy Control Point Sequence (300A,02D0) by scaling times for the current source delivery strength and accounting for other delivery device capabilities influencing the actual delivery.

In brachytherapy treatment techniques where Brachy Treatment Type (300A,0202) is PDR, the Specified Channel Total Time (3008,0132) shall consist of the specified channel total time summed over the Specified Number of Pulses (3008,0136).

The following examples describe the contents of Specified Channel Total Time (3008,0132), Delivered Channel Total Time (3008,0134) and Treatment Termination Status (3008,002A) under normal and interrupted delivery conditions.

Example:

Fraction delivered without interruption
- Session 1:
  - Specified Channel Total Time = 100.0 seconds
  - Delivered Channel Total Time = 100.0 seconds
  - Treatment Termination Status = NORMAL
Fraction delivered with interruption. Second session delivered in timely manner such that there is negligible source decay between sessions.
- Session 1:
  - Specified Channel Total Time = 100.0 seconds
  - Delivered Channel Total Time = 50.0 seconds
  - Treatment Termination Status = OPERATOR or MACHINE
- Session 2:
  - Specified Channel Total Time = 50.0 seconds
  - Delivered Channel Total Time = 50.0 seconds
  - Treatment Termination Status = NORMAL
Fraction delivered with interruption. Second session delivered later such that additional source decay between sessions must be accounted for. In Session 2 the source is at approximately 96% of Session 1 strength.
- Session 1:
  - Specified Channel Total Time = 100.0 seconds
  - Delivered Channel Total Time = 50.0 seconds
  - Treatment Termination Status = OPERATOR or MACHINE
- Session 2:
  - Specified Channel Total Time = 52.0 seconds
  - Delivered Channel Total Time = 52.0 seconds
  - Treatment Termination Status = NORMAL