评估和缓解可变形图像注册不确定性的MRI引导自适应性放射治疗
Hualiang Zhong1, Kristofer K Kainz1, Eric S Paulson1
1Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
Journal of applied clinical medical physics
|April 18, 2024
概括
这项研究评估了腹部MRI的可变形图像注册 (DIR),并开发了一种混合FEM方法来减少错误. 这种新技术成功地减少了器官内部的不确定性,提高了注册准确度.
科学领域:
- 医疗成像医学成像
- 计算解剖学的计算解剖学
- 生物机械建模 生物机械建模
背景情况:
- 变形图像注册 (DIR) 对于分析医学成像中的解剖变化至关重要,特别是在腹部MRI中.
- 准确的注册对于瘤学的定量分析和治疗规划至关重要.
- 现有的DIR软件包可能存在不确定性,需要改进方法.
研究的目的:
- 评估用于腹部MRI的可变形图像注册 (DIR) 软件包的性能.
- 开发和评估一种机械建模方法,以减轻DIR引起的不确定性.
- 为了比较不同DIR算法及其修改的准确性.
主要方法:
- 用三个指标 (MDA,DSC,STD-JD) 来评估MIM软件 (基于MM,CC,II) 和CM-FEM算法.
- 开发了一种混合FEM注册技术来修改MIM位移向量场.
- 在10名癌症患者的腹部MRI上评估了注册,并使用Wilcoxon-Mann-Whitney测试进行了统计比较.
主要成果:
- 在MIM算法中,MIM-CC显示了最低的平均偏移到一致 (MDA) 和最高的DICE相似系数 (DSC).
- 然而,MIM-CC在腹部器官内部表现出显著的雅可比安不确定性.
- 混合FEM技术显著降低了雅可比安的不确定性 (p < 0.0084),同时保持了高的MDA和DSC值.
结论:
- MIM-CC算法提供了良好的整体注册性能,但在雅可比安不确定性方面存在局限性.
- 开发的混合FEM注册技术有效地减轻了内部器官区域的这些雅可比安不确定性.
- 这种混合方法提高了DIR用于腹部MRI分析的可靠性.
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