带有用于固定机架放射治疗的患者旋转系统的高场在线磁共振成像直线加速器的成像性能。

Imaging performance of a high-field in-line magnetic resonance imaging linear accelerator with a patient rotation system for fixed-gantry radiotherapy.

作者信息

Buckley Jarryd G, Dong Bin, Liney Gary P

机构信息

Centre for Medical Radiation Physics, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.

Ingham Institute for Applied Medical Research, 1 Campbell St, Liverpool, NSW 2170, Australia.

出版信息

Phys Imaging Radiat Oncol. 2020 Nov 18;16:130-133. doi: 10.1016/j.phro.2020.11.001. eCollection 2020 Oct.

DOI:10.1016/j.phro.2020.11.001

PMID:33458355

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7807630/

Abstract

This paper describes the imaging performance of a high-field in-line MRI linear accelerator with a patient rotation system in-situ. Signal quality was quantified using signal-to-noise ratio (SNR) and RF uniformity maps. B0-field inhomogeneity was assessed using magnetic field mapping. SNR was evaluated with various entries into the Faraday cage which were required for extended couch translations. SNR varied between 103 and 87 across PRS rotation angles. Maximum B0-field inhomogeneity corresponded to 0.7 mm of geometric distortion. A 45 × 55 cm aperture allowed PRS translation with no reduction in SNR. Imaging performance with the PRS in-situ was found to be acceptable.

摘要

本文描述了一种带有患者旋转系统的高场在线MRI直线加速器的成像性能。使用信噪比（SNR）和射频均匀性图对信号质量进行了量化。使用磁场映射评估了B0场不均匀性。通过法拉第笼的各种入口评估了SNR，这是延长治疗床平移所必需的。在PRS旋转角度范围内，SNR在103至87之间变化。最大B0场不均匀性对应于0.7毫米的几何畸变。45×55厘米的孔径允许PRS平移而不会降低SNR。发现PRS原位时的成像性能是可以接受的。