ESTRO 2023 - Abstract Book

S165

Saturday 13 May

ESTRO 2023

Conclusion The proposed DIR algorithm was analysed for its performance to account for large anatomical deformations during IGRT in the pelvis. MR images of prostate cancer patients with delineations of the prostate, bladder and rectum were chosen. The results show an overall improvement in the propagation of the contours, particularly within the bladder, compared to several well-established DIR algorithms.

Poster Discussion: Breast

PD-0230 One week hypofractionated breast radiotherapy acute toxicity with SIB and regional nodal irradiation G. Potdevin-Stein 1 , A. Cristian C. 2 , A. Vallejo 2 , I. Libreros 2 , I. Storino 2 , C. Echeverri 2 , D.E. Santa-María 2 , G.A. Marín 2 , C.A. Buelvas 2 , R. Ciérvide 3 , Á. Montero-Luis 3 1 Hospital Universitario de Gran Canaria Dr Negrín, Radiation Oncology, Las Palmas de Gran Canaria, Spain; 2 Hospital Universitario Fundación Valle del Lili, Radiation Oncology, Cali, Colombia; 3 Hospital Universitario HM Hospitales, Radiation Oncology, Madrid, Spain Purpose or Objective One-week-hypofractionated-radiation treatment (OWHRT) is not inferior to the 3-week-hypofractionated-regimen in disease control and acute toxicity (AC). The objective is to describe our experience using this ultra-hypofractionated schedule for whole breast/chest wall (WB/CWI) and regional nodal irradiation (RNI), internal mammary chian (IMC) and a simultaneous integrated boost (SIB). Materials and Methods