ESTRO 2024 - Abstract Book

S67 ESTRO 2024 The first patient was treated in the Danish HCC protocol in April 2022. Currently, 28 patients have been treated, and fifty patients will be included in the protocol in four years. This teaching lecture will include a short, overall brush-up on the physical properties of protons and the advantages and attention points of treating moving targets using proton therapy will be presented. Hence, knowledge of or experience with proton therapy is not required to attend. Treatment planning, daily IGRT, matching strategies and treatment of the HCC patients will be described. During this description, the motion challenges faced and motion management strategies used will be continuously presented. Moreover, early results from some quality assurance studies conducted at the DCPT regarding motion management strategies, will be briefly presented. The focus will be on the motion challenges and motion management strategies relevant to the RTTs' work in treating patients with primary liver tumors. Invited Speaker

3432

MRI QA for radiotherapy physicists

Rob HN Tijssen

Catharina Hospital, Radiation Oncology, Eindhoven, Netherlands

Abstract:

Synopsis

The utilization of MRI for radiation therapy planning continuous to expand. Its usage these days spans from consultation of diagnostic images to dedicated radiotherapy MRI-simulation and online plan adaptation on MR-linac systems. Each of these applications has distinct requirements, necessitating different levels of quality assurance (QA). In this lecture, we will cover the various use cases of MRI in radiation therapy and the necessary QA that is involved. An overview the recently published guidelines by the AAPM, NCS, and IPEM is given, and the structure of the proposed QA programs is discussed. In addition, I will explain the physics rationale behind some key QA tests relevant to the different MRI applications in radiation therapy.

Target audience

(Medical) physicists working in the field of radiotherapy.

Prior knowledge

Some basic understanding of MR physics is required. Attendees should be familiar with basic signal formation and space encoding in MRI.

Highlights

• MRI-QA for RT is more involved than a typical diagnostic MRI-QA program • The way that the MRI images are used determines the level of QA that is necessary • Several guidelines on the use of MRI for RT have been published over the last few years • These QA programs are discussed and the included QA tests are explained