ESTRO 2024 - Abstract Book

S5966

RTT - Treatment planning, OAR and target definitions

ESTRO 2024

Conclusion:

This study showed good agreement in terms of DSC and MDA for all delineated OARs and that trained RTTs were able to provide the same quality of contouring as ROs in breast cancer patients. The results of this study support the increasing role of RTTs in contouring, which is likely to become increasingly time-saving in each radiotherapy department workflow.

Keywords: Breast cancer, contouring, RTT

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Digital Poster

A systematic review of 4D MRI techniques for abdominal radiotherapy treatment planning

Lamyaa Aljaafari 1,2,3 , David Bird 3 , David L Buckley 2 , Bashar Al-Qaisieh 3 , Richard Speight 3,2

1 King Saud bin Abdulaziz University for Health Sciences, Department of Radiology Sciences, Alahssa, Saudi Arabia. 2 University of Leeds, School of Medicine, Leeds, United Kingdom. 3 St James's University Hospital, Department of Medical Physics and Engineering, Leeds, United Kingdom

Purpose/Objective:

Four-dimensional computed tomography (4D CT) imaging is the current gold standard for motion management for abdominal radiotherapy planning. However, due to poor soft tissue contrast, motion artifacts, and reliance on the liver's motion to estimate tumour movement, four-dimensional magnetic resonance imaging (4D MRI) is being investigated as an alternative option. This systematic review assesses the literature exploring methods available for 4D MRI in abdominal radiotherapy for pre-treatment radiotherapy planning, evaluates 4D MRI technical considerations, and assesses the validity of using 4D MRI for patients within radiotherapy protocols.

Material/Methods:

The systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A comprehensive search was performed across the Medline, Embase, Scopus, and Web of Science databases, covering all years up to June 9, 2023. Articles were included that referred to '4D MRI','respiratory motion', and 'radiotherapy' or their synonyms in the title and abstract. Primary screening involved evaluating titles and abstracts for the specific use of 4D MRI in radiotherapy. Articles that focused on organs unrelated to respiratory motion or were not relevant to 4D MRI and radiotherapy were excluded. The secondary screening assessed the titles and abstracts for the utilisation of 4D MRI in abdominal treatment planning applications. Articles related to 4D MRI obtained for magnetic resonance-guided radiotherapy (MRgRT) were excluded from the review, including studies involving tumour tracking adaptation. Additionally, studies that used orthogonal 2D cine, 4D synthetic CT (4D sCT), examined patients with lung cancer only, or involved animals were also excluded. Tertiary screening evaluated full text screening to include 4D MRI validation in patients. Thus, studies acquired in volunteers or phantoms only were