Alzahrani, M;
Broadbent, DA;
Chuter, R;
Al-Qaisieh, B;
Jackson, S;
Michael, H;
Johnstone, RI;
... Speight, R; + view all
(2020)
Audit feasibility for geometric distortion in magnetic resonance imaging for radiotherapy.
Physics and Imaging in Radiation Oncology
, 15
pp. 80-84.
10.1016/j.phro.2020.07.004.
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Abstract
Background and purpose: Magnetic Resonance Imaging (MRI) is increasingly being used in radiotherapy (RT). However, geometric distortions are a known challenge of using MRI in RT. The aim of this study was to demonstrate feasibility of a national audit of MRI geometric distortions. This was achieved by assessing large field of view (FOV) MRI distortions on a number of scanners used clinically for RT. / Materials and methods: MRI scans of a large FOV MRI geometric distortion phantom were acquired on 11 MRI scanners that are used clinically for RT in the UK. The mean and maximum distortions and variance between scanners were reported at different distances from the isocentre. / Results: For a small FOV representing a brain (100–150 mm from isocentre) all distortions were < 2 mm except for the maximum distortion of one scanner. For a large FOV representing a head and neck/pelvis (200–250 mm from isocentre) mean distortions were < 2 mm except for one scanner, maximum distortions were > 10 mm in some cases. The variance between scanners was low and was found to increase with distance from isocentre. / Conclusions: This study demonstrated feasibility of the technique to be repeated in a country wide geometric distortion audit of all MRI scanners used clinically for RT. Recommendations were made for performing such an audit and how to derive acceptable limits of distortion in such an audit.
| Type: | Article |
|---|---|
| Title: | Audit feasibility for geometric distortion in magnetic resonance imaging for radiotherapy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.phro.2020.07.004 |
| Publisher version: | https://doi.org/10.1016/j.phro.2020.07.004 |
| Language: | English |
| Additional information: | Copyright © 2020 The Authors. Published by Elsevier B.V. on behalf of European Society of Radiotherapy & Oncology. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). |
| Keywords: | Magnetic resonance imaging, Geometric distortion, Radiotherapy, Quality assurance, Audit |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10109470 |
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