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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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...
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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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实时剂量重建和剂量覆盖率预测使用磁共振线性加速器.

Peter R S Stijnman1, Pim T S Borman1, Stijn Oolbekkink1

  • 1Department of Radiotherapy, University Medical Center Utrecht, the Netherlands.

Physics and imaging in radiation oncology
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概括

在MR-Linac放射治疗期间实时剂量监测准确地跟踪患者的运动,从而实现自动治疗调整. 这种工作流预测累积剂量,提高辐射疗法的精度和患者的治疗结果.

关键词:
剂量评估 剂量评估图像指导放射疗法是指导图像的放射疗法.实时实时的时间.

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科学领域:

  • 医学物理 医学物理
  • 辐射瘤学 辐射瘤学
  • 医疗成像医学成像

背景情况:

  • 在放射治疗期间患者的运动会导致剂量偏离治疗计划.
  • 精确的剂量监测对于有效的放射治疗至关重要.

研究的目的:

  • 开发和验证 MR-Linac 治疗期间实时剂量计算和预测的工作流程.
  • 为了实时评估适应性放射治疗的剂量指导.

主要方法:

  • 收集了有关治疗解剖学,患者运动 (刚性翻译,3D卷) 和 linac 状态的数据.
  • 使用MRI成像进行实时剂量重建和累积剂量预测.
  • 根据二极管和薄膜测量对刚性和可变形场景进行验证的计算.

主要成果:

  • 实时剂量重建显示,与测量剂量相比,最大标准偏差误差为2.3%.
  • 工作流实现了 92% 的光束上线时间在单个 GPU 上实现实时性能.
  • 剂量覆盖预测被动更新,在治疗结束时变得越来越频繁.

结论:

  • 使用MR-Linac实时显示剂量分配和剂量覆盖率预测的可行性已被证明.
  • 工作流支持自动调整计划和断层内偏移校正 (IDC).
  • 这项技术通过考虑碎片内运动,提高了放射治疗的精度.