组织氧化估计的稳定性通过连续波空间分辨近红外光谱学估计
Caterina Amendola1, Davide Contini1, Rebecca Re1,2
1Politecnico di Milano, Dipartimento di Fisica, Milan, Italy.
Journal of biomedical optics
|July 19, 2023
概括
空间分辨率光谱 (SRS) NIRS在表面组织层存在或散射特性发生变化时,高估了组织的氧和度. 这凸显了临床使用的局限性,表明需要先进的方法.
科学领域:
- 生物医学光学 生物医学光学
- 医学物理 医学物理
背景情况:
- 连续波近红外光谱 (CW-NIRS) 是评估肌肉和大脑氧化的临床工具.
- 空间分辨率光谱 (SRS) 是一个常见的CW-NIRS实现,但在散射特性和组织均性假设方面存在局限性.
研究的目的:
- 为了评估SRS NIRS的准确性和稳定性.
- 为了调查血液动力学参数检索中的错误,特别是组织氧和 (),在不同的散射条件和分层组织模型下.
主要方法:
- 模拟骨肌模型中的血液动力学变化,使用光子扩散方程的分析解决方案.
- 采用半无限同质和双层介质,表面层厚度 (5,7.5,10 mm) 和源探测器距离 (30,40,45 mm) 不同.
- 使用SRS方法分析模拟数据,以推导出血液动力学参数及其相对误差.
主要成果:
- 减少散射系数 () 的变化影响了估计的高达15%,特别是波长依赖的变化.
- 表面组织层的存在显著影响了准确性,当表面厚度超过5毫米时,估计的误差超过20%.
结论:
- SRS NIRS的主要局限性是它对表面组织层的敏感性,这导致血液动力学参数估计存在重大错误.
- 更先进的NIRS策略,例如使用多个源-探测器距离,是必要的,以减轻表面组织的影响.
- 使用SRS NIRS的临床医生应该意识到其固有的局限性,特别是在复杂的组织环境中.
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