ESTRO 2024 - Abstract Book

S4103

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

Figure 1: Box plot of the fraction average doses to the CTVp relative to the planned average dose. Each box summarises the fraction doses for one patient. The patients are ordered by increasing median fraction dose.

The pelvic lymph node target volumes, CTVn_E and PTVn_E, were propagated to the corrCBCTs using a bone-focused rigid image registration, which is considered appropriate as the lymph nodes are affixed to the bone. Figure 2 shows the fraction coverages ( V 95% ) of these target volumes. PTVn_E fraction coverages significantly below the planning objective of V 95% > 98% are observed for most patients whereas the CTVn_E fraction coverages are all close to the planning objective of V 95% = 100%.