ESTRO 2024 - Abstract Book

S4039

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

Re-planning necessary

not

V95%>95%

97.80%

96.81%

1.01%

Table 1.Difference in DVH parameters on PTV between doses calculated on pCT and CT2

Figure 1: Example of one treatment fraction evaluated using AdaptBox. On the left, the dose calculated on the planning CT; on the right, the dose calculated on the synthetic CT.

Conclusion:

In conclusion, the number of secondary planning CT scans performed were unjustified in 50% of the cases. AdaptBox proved to be an effective tool to assist physicians and physicists in the decision making process for re-planning.

Keywords: Offline Adaptive RT, CBCT based synthetic CT

1544

Digital Poster

Leveraging IGRT towards a fast CBCT based online adaptive treatment for prostate plus lymph nodes

Peter Remeijer, Suzan Gerrets, Simon van Kranen, Paula Bos, Carmen Seller Oria, Begoña Vivas Maiques, Maarten Broekhof, Rens van Haveren, Geert Wortel, Johan Trinks, Sanne van Weerdenburg, Herbert Beemster, Martijn Barsingerhorn, Dos Moonen, Ruben Bosschaert, Rob Reurings, Astrid Smit, Kaylee Bon, Lisa Wiersema, Gerike Ligtenberg, Wouter Vogel, Jan-Jakob Sonke, Marloes Frantzen-Steneker, Zeno Gouw

The Netherlands Cancer Institute, department of Radiotherapy, Amsterdam, Netherlands