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可变形的人形骨盆幻影用于剂量积累验证.

Yun Ming Wong1, Calvin Wei Yang Koh2,3, Kah Seng Lew1,2

  • 1Division of Physics and Applied Physics, Nanyang Technological University, Singapore, Singapore.

Physics in medicine and biology
|May 31, 2024
PubMed
概括

一个新的3D打印可变形的骨盆幻影精确地评估了图像注册中的voxel映射精度. 子相似系数显示前列腺和直肠的相关性很好,但膀没有,突出了需要改进验证指标的需要.

关键词:
通过3D打印打印3D打印.适应性放射疗法适应性放射疗法可变形的人形幻影.可变形图像的注册 变形图像的注册子的相似度系数剂量累积剂量的累积.目标注册错误 目标注册错误

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科学领域:

  • 医学物理和成像学
  • 放射治疗和瘤学
  • 3D打印和生物医学工程

背景情况:

  • 基于轮的指标是在轮传播中验证可变形图像注册 (DIR) 的标准.
  • 沃克塞尔映射精度对于剂量积累至关重要,但可能无法完全通过轮指标来表示.
  • 需要强大的方法来评估像骨盆这样复杂的解剖区域的DIR准确性.

研究的目的:

  • 为了制造一个可变形的人形骨盆幻影,使用3D打印用于DIR验证.
  • 在各种变形场景和组织对比中量化voxel映射精度.
  • 评估子相似系数 (DSC) 与子映射精度 (目标注册错误 - TRE) 之间的相关性.

主要方法:

  • 3D打印可变形的骨盆幻影的制造,其中包含关键器官 (骨盆骨,前列腺,膀,直肠) 的集成标记.
  • 通过改变膀和直肠体积来模拟四种变形场景.
  • 使用RayStation v10B进行9次可变形图像注册,并通过TRE.量化voxel映射精度.

主要成果:

  • 3D打印的幻影成功地复制了现实的解剖变形.
  • 随着变形的增加,Voxel映射的准确性下降,但随着更多的指导器官或有限的注册区域,它得到了改善.
  • 子相似系数与前列腺和直肠的声素映射精度相关性很好 (DSC>0.85/0.90,表明TRE ≤0.3厘米),但对于膀的相关性较小.

结论:

  • 一个3D打印的可变形骨盆幻影是量化DIR voxel映射精度的一个可行的工具.
  • 子相似系数是前列腺和直肠的可靠指标,但不足以验证膀的准确性.
  • 在临床应用中,除了DSC之外,还需要额外的指标来全面验证可变形图像注册准确性.