ESTRO 2022 - Abstract Book

S1626

Abstract book

ESTRO 2022

Figure 1: Test scans images from the MRI Scanner on the final design probe and ASPK setup (Material passed the image test and dimension accuracy was achieved).

Figure 2: Final CNC machined prototype of the MRI-safe probe and ASPK (with commercial knee rest).

Conclusion Final CNC-machined MRI-safe probe and ASPK was developed for subsequent TPUS prostate patients requiring CT/MRI fusion during radiotherapy treatment planning. Moving forward, the effectiveness of this gadget on the reproducibility of patient position during MRI to facilitate image fusion for contouring of the prostate gland will be assessed in this novel clinical workflow for prostate cancer patients. Additionally, the gadget can also be used for patient education to improve compliance during setup.

PO-1830 Reproducibility of the bite block during radiotherapy of head-and-neck cancer patients

V. Leijser-Kersten 1 , M. Heldens-van Rooy 2

1 UMC St Radboud , Radiation Oncology, Nijmegen, The Netherlands; 2 UMC St Radboud Nijmegen, Radiation Oncology, Nijmegen, The Netherlands Purpose or Objective For radiation treatment of some head-and-neck cancer patients bite blocks are necessary. The function of the bite block is to stabilize the position of the jaw, tongue and/or lip. A suboptimal positioned bite block at the planning-CT scan degrades treatment quality and causes extra workload at the linac, because the bite block position cannot accurately be reproduced. The purpose of this study was to estimate the reproducibility of the bite block in an early stage of the treatment using CBCT scans.

Materials and Methods