计算机断层扫描序列集成用于金属植入物患者的增强质子疗法
Daniel Maneval1, Luka McNeill1, Ronan Penard1
1Radiotherapy Department, Mediterranean Institute of Proton Therapy, Centre Antoine Lacassagne, 227, avenue de la Lanterne, 06200 Nice, France.
双能量CT (DECT) 与代金属工件减少 (IMAR) 和大电压CT (MVCT) 提高了金属植入物的质子治疗精度. 将MVCT与DECT衍生的停止功率比率 (SPR) 或相对电子密度 (RED) 结合起来,可提高复杂病例的处理精度.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 生物医学成像技术 生物医学成像技术
背景情况:
- 在接受质子疗法的患者中,金属植入物会导致显著的图像扭曲和剂量计算错误.
- 准确的成像和剂量计算对于有效和安全的笔束扫描质子疗法至关重要,特别是在金属文物中.
研究的目的:
- 评估单能CT (SECT),双能CT (DECT) 具有代金属工件减少 (IMAR) 和大电压CT (MVCT),以优化质子疗法中的成像和剂量测量.
- 在金属植入物存在的情况下,评估不同CT成像协议的几何和剂量准确性.
主要方法:
- 使用和合金植入物的幻影研究使用SECT (使用MAR),DECT (使用IMAR) 和MVCT进行.
- 处理了DECT数据集以生成虚拟单能图像 (VMI),相对电子密度 (RED) 和制止功率比 (SPR) 图像.
- 使用Dice相似系数和豪斯多夫距离评估了几何准确性;使用薄膜和电离室验证了CT数量校准和质子范围/剂量准确性.
主要成果:
- MVCT表现出最高的几何准确度 (子=0.89).
- 对于和固态水,SECT提供了最准确的密度估计.
- 使用SPR或RED的IMAR进行DECT,实现了优异的剂量精度 (γ>98%) 和范围精度 (≈1.1毫米),复杂的植入物 (0.8毫米至7.6毫米) 的范围误差有显著差异.
结论:
- 带有IMAR的SPR或RED可为小型植入物提供准确的剂量和范围估计.
- 对于较大或高Z的植入物,将MVCT与SPR或RED (与IMAR) 结合起来,可以显著提高治疗精度,因为增加了几何和剂量测量精度.
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