在MR-linac上使用合成CT进行前列腺放射治疗的仅MRI模拟,规划和治疗工作流程的开发和实施
Reza Reiazi1, Yao Ding1, Sarath Vijayan1
1Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
Journal of applied clinical medical physics
|February 9, 2026
概括
一个新的磁共振 (MR) 仅用于前列腺癌放射治疗的工作流程是可行的和准确的. 这种仅用于MRI的模拟,规划和治疗 (MROSPT) 工作流使用来自MRI的合成CT (sCT),简化治疗并消除CT扫描.
科学领域:
- 放射治疗 物理 物理
- 医疗成像医学成像
- 在瘤学瘤学.
背景情况:
- 目前的放射治疗工作流程通常依赖于CT模拟,这涉及对电离辐射的暴露.
- 基于MR的放射治疗提供了潜在的优势,包括优越的软组织对比度和避免辐射剂量.
- 将MRI整合到整个放射治疗工作流程中,需要从MRI数据中生成准确的合成CT (sCT).
研究的目的:
- 评估仅MR的前列腺癌仿真,规划和治疗 (MROSPT) 工作流程的可行性和剂量准确性.
- 为了验证在放射治疗中用于剂量计算的MRI数据生成的合成CT (sCT) 的使用.
- 建立一个精简的放射治疗过程,消除CT模拟的需要,并使MR-linac (MRL) 实现.
主要方法:
- 开发一个全面的MROSPT工作流程,从咨询到治疗交付.
- 在九名前列腺癌患者的追溯剂量测定验证研究中,使用CT和MRI模拟.
- 从MRI数据生成sCT,并将治疗计划从参考CT (rCT) 转移到sCT进行剂量比较,使用玛分析 (2%/2mm).
- 创建散装密度sCTs (bCTs) 以进一步评估治疗规划效率.
主要成果:
- 在rCT和sCT之间最小的Hounsfield单位 (HU) 差异 (前列腺5.5±2.9HU) 表明可靠的sCT生成.
- 马分析显示,rCT与sCT和rCT与bCT计划之间的剂量测量一致性在±2%.
- 在使用2%/2mm标准进行的两次比较中,马指数合格率始终超过95%.
- 成功完成了整个模拟到处理工作流程的干燥运行.
结论:
- 使用sCT的MR-only模拟,规划和治疗 (MROSPT) 工作流程在临床上是可行的,并且对于前列腺癌放射治疗在剂量学上是准确的.
- 基于sCT和基于CT的剂量计算之间的高度一致性支持在前列腺癌治疗计划中采用sCT.
- 该工作流显示了对其他解剖区域,特别是骨盆的潜在适用性,通过质量保证和灵活的治疗提供,可以进一步改进.
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