ESTRO 2023 - Abstract Book

S295

Sunday 14 May 2023

ESTRO 2023

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Figure 1

Flowchart of the 'traffic light' system.

Results The average time taken for each treatment fraction that required no intrafractional shifts was 98.2 seconds. Out of the 15 fractions observed, 6 fractions encountered 1 beam interruption with an added average time of 145 seconds to the treatment duration. In comparison, standard non-TI prostate treatment had an average treatment time of 69.8 seconds. Utilising the Eclipse planning system, a dose reconstruction was performed on the plan prior to the intrafractional shifts being made. The average percentage of the PTV and CTV receiving 98% total dose retrospectively decreased significantly by 7.29% and 0.17%.