ESTRO 2024 - Abstract Book

S5950

RTT - Treatment planning, OAR and target definitions

ESTRO 2024

Table 1: Difference in prostate contour volume delineated in CT and MRIDEF compared to MRI

Conclusion:

Through the implementation of a dedicated workflow for CT-MRI fusion, it has become possible to generate high quality images that enable precise outlining of the volume of the prostate. The use of this workflow is essential as relying solely on CT images would result in an overestimation of the prostate volume. Furthermore, the process is fully automated, thus eliminating any potential inconsistencies in registration that could arise from manual guidance.

Keywords: Deformable image registration, Prostate

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Evaluation of pendulous breast patients undergoing radiotherapy with and without bra immobilization

Li Hoon Lim 1 , Eric Pei Ping Pang 1,2 , Grace Kusumawidjaja 1,2

1 National Cancer Centre Singapore, Radiation Oncology, Singapore, Singapore. 2 Duke-NUS Medical School, Oncology ACP, Singapore, Singapore

Purpose/Objective:

Patients with pendulous breasts who undergo radiotherapy in the supine position often encounter challenges such as positioning due to the mobility of the target volume, dose constraints to the organs-at-risk (OARs) as well as higher risk of radiation dermatitis due to the infra-mammary fold. For left-sided treatment, the cardiac dose is often at risk of exceeding constraints. This study evaluated the OARs doses of pendulous breast patients treated with and without an immobilization bra.

Material/Methods: