ESTRO 2024 - Abstract Book

S216

Brachytherapy - Gynaecology

ESTRO 2024

significantly reduced with automated planning for all fractions (Figure 1), with a reduction in average time from 44.1 minutes (23.2 min plan generation + 22.8 min plan adjustment) to 9.4 minutes (5.3 min plan generation + 4.0 min plan adjustment). Manual workload was therefore reduced from 44.1 minutes to 4.0 minutes. The VAS scoring showed an overall plan preference for Auto_Adj in 28/37 fractions, parity in 7 and a preference for Man_Adj in 2 fractions (Figure 2). Figure 2 shows that superiority of Auto_Adj was mostly related to perceived superior doses in targets or OARs. A slight preference for Man_Adj was expressed for the loading pattern. The strong preference of physicians for Auto_Adj plans was in line with favourable EMBRACE II dosimetric plan parameters, and in line with previous reporting on Auto plans dosimetric.

Conclusion:

Automated treatment planning in cervical cancer brachytherapy could reduce the total daily planning time with approximately 35 minutes, while the five participating treating physicians also preferred the automated plans based on the dosimetric advantages.

Figure 1: Both for Manual planning and Auto planning, times for initial plan generation and for adjustments by the treating physician. For Manual, the initial plan generation was performed by an RTT, while for Auto, initial planning was performed automatically with BiCycle. Times were recorded for 33/37 plans (empty bars in graph). Plans are ordered as in figure 2.