1.5 T MR-Linac 的质量保证
Hans Lynggaard Riis1, Joan Chick2, Alex Dunlop2
1Department of Oncology, Odense University Hospital, Odense, Denmark; Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
Seminars in radiation oncology
|December 17, 2023
概括
本次审查涵盖了MRI-线性加速器 (linac) 系统的质量保证 (QA),强调了通过先进成像技术确保精确的辐射传递的挑战和方法.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 磁共振成像是一种磁共振成像技术.
背景情况:
- 商用1.5 T MR-linac系统提供了改善的患者成像和在线适应性辐射疗法 (oART).
- 由于高磁场环境,MR-linac技术的质量保证 (QA) 需要专门的方法.
- 标准质量保证程序需要适应MR-linac系统的独特限制.
研究的目的:
- 审查和综合科学文献中记录的MR-linac特定的质量保证程序.
- 确定在高场MR环境中的质量保证的挑战和解决方案.
- 为确保MR-linac机器的可靠性能提供当前实践的概述.
主要方法:
- 对MR-linac系统发布的质量保证协议的文献综述.
- 分析与磁场干扰,成像和辐射输送相关的质量保证要求.
- 检查供应商提供的和用户开发的质量保证程序.
主要成果:
- 磁场的MR-linacs影响幻影,探测器,和工具选择的质量保证.
- 集成的大电压成像仪 (MVI) 对于光束校准和质量保证至关重要.
- 用户开发了独立的质量保证系统,以验证机器性能和剂量输送精度.
- 在MRI成像和辐射同心之间对齐检查是必不可少的.
结论:
- MR-linac QA 需要量身定制的方法,考虑到集成的高场 MR 和 linac 组件.
- 独立验证方法对于确保治疗确定性和患者安全至关重要.
- 对于这种不断发展的技术,需要标准化和进一步开发质量保证协议.
相关概念视频
01:14NMR Spectrometers: Resolution and Error Correction
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
01:24Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...