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Marker-Free Tracking of Facet Capsule Motion using Polarization-Sensitive Optical Coherence Tomography

机译：使用偏振敏感光学相干层析成像技术的无标记小平面胶囊运动跟踪

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摘要

We proposed and tested a method by which surface strains of biological tissues can be captured without the use of fiducial markers by instead, utilizing the inherent structure of the tissue. We used polarization-sensitive optical coherence tomography (PS OCT) to obtain volumetric data through the thickness and across a partial surface of the lumbar facet capsular ligament (FCL) during three cases of static bending. Reflectivity and phase retardance were calculated from two polarization channels, and a power spectrum analysis was performed on each a-line to extract the dominant banding frequency (a measure of degree of fiber alignment) through the maximum value of the power spectrum (maximum power). Maximum powers of all a-lines for each case were used to create 2D visualizations, which were subsequently tracked via digital image correlation. In-plane strains were calculated from measured 2D deformations and converted to 3D surface strains by including out-of-plane motion obtained from the PS OCT image. In-plane strains correlated with 3D strains (R2 ≥ 0.95). Using PS OCT for marker-free motion tracking of biological tissues is a promising new technique because it relies on the structural characteristics of the tissue to monitor displacement instead of external fiducial markers.
机译：我们提出并测试了一种方法，通过该方法可以利用生物组织的固有结构来捕获生物组织的表面应变，而无需使用基准标记。我们使用偏振敏感光学相干断层扫描（PS OCT）在三种静态弯曲情况下，通过整个厚度以及整个腰椎小面囊韧带（FCL）的部分表面获得体积数据。从两个偏振通道计算出反射率和相位延迟，然后对每条a线进行功率谱分析，以通过功率谱的最大值（最大功率）提取主带频率（光纤对准程度的度量） 。每种情况下所有a线的最大功率用于创建2D可视化，随后通过数字图像相关性对其进行跟踪。根据测量的2D变形计算面内应变，并通过包含从PS OCT图像获得的面外运动将其转换为3D表面应变。面内应变与3D应变相关（R 2 ≥0.95）。使用PS OCT进行生物组织的无标记运动跟踪是一种有前途的新技术，因为它依赖于组织的结构特征来监视位移，而不是依靠外部基准标记。

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