ESTRO 2022 - Abstract Book

S1488

Abstract book

ESTRO 2022

Conclusion Intra-fraction motion presents an important target variation influencing treatment results in SBRT. Margin calculation for intra-fraction motion of pelvic lymph node metastasis resulted in an estimated margin of 2.8, 3.3, and 2.3 mm.

PO-1689 Potential NTCP reductions for high-risk prostate cancer patients by MR-guided adaptive radiotherapy

R.L. Christiansen 1,2 , L. Dysager 3 , C.R. Hansen 1,2 , T. Schytte 3,2 , A.S. Bertelsen 1 , H.R. Jensen 1 , F. Mahmood 1,2 , C.J. Nyborg 3 , S. Hansen 3 , S.N. Agergaard 1 , O. Hansen 3,2 , C. Brink 1,2 , U. Bernchou 1,2 1 Odense University Hospital, Laboratory of Radiation Physics, Odense, Denmark; 2 University of Southern Denmark, Department of Clinical Research, Odense, Denmark; 3 Odense University Hospital, Department of Oncology, Odense, Denmark Purpose or Objective Daily, MR-guided online adapted radiotherapy (MRgART) facilitates reduced PTV margins in pelvic RT. This study investigates the potential benefit from MRgART in terms of normal tissue complication probability (NTCP) in comparison to standard CBCT linac treatment for high-risk prostate cancer patients.

Materials and Methods