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High-speed Quantitative Polarization Imaging Instrument for In-situ DynamicMeasurement of Birefringence Properties

机译：高速定量偏振成像仪用于双折射特性的原位动态测量

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摘要

Tendon-to-bone insertion is a highly specialized tissue connecting two dissimilar materials, flexible tendon and stiff bone. Damaged tendon-to-bone insertions cannot be regenerated and the failure rate of surgical repairs of tendon-to-bone insertion is high. The aim of this work is to better understand the mechanical behavior of the tendon-to-bone insertion and reorganization of collagen fibers during medium-high strain rate events, such as sporting or car accidents. To accomplish this a high-speed quantitative polarized light microscopy (QPLM) instrument has been developed. The technique can monitor collagen fiber spatial realignment during controlled medium-high strain-rate experiments at acquisition rates up to 10 kHz. By utilizing a rotating quarter wave plate and a high-speed camera, the minimum acquisition time to generate an alignment map of a birefringent specimen is 6.0 ms. A sequential analysis method allows the QPLM instrument to generate QPLM data through a high-speed camera at 10 kHz. This high-speed QPLM instrument was implemented within a modified drop tower and validated using benchmark polycarbonate specimens.;Porcine tendon-to-bone insertion specimens were tested using the modified drop tower to create dynamic tensile loading at an average maximum displacement rate of 1.24m/s. The collagen fiber realignment was tracked using the high-speed QPLM instrument. The results demonstrate that the tendon-to-bone insertion mitigates the potential impact of dynamic stress conditions through a sequence of localized deformations.;The first method revealed some limitations due to the sequential images required to generate alignment maps. Therefore, a second approach to measure the specimen birefringence was investigated. A high-speed camera with a linear array of polarization filters, was utilized to monitor the tendon-to-bone insertion specimen collagen fiber realignment during dynamic loading. This eliminated the requirement to have sequential images as the polarization stagers provide the alignment information for each image independently. The experimental results showed the use of the high-speed polarization camera significantly improved the measurement acquisition speed. This research provides a foundation for studying collagenous biological tissue mechanical behavior and detecting damage in biological tissues through local collagen fiber realignment and fracture during dynamic loading.
机译：肌腱到骨头的插入是一种高度专业化的组织，连接两种不同的材料，即柔性肌腱和坚硬的骨头。受损的肌腱-骨插入物无法再生，并且肌腱-骨插入物的手术修复失败率很高。这项工作的目的是更好地了解在中等高应变率事件（例如运动或交通事故）期间，腱-骨插入和胶原纤维重组的机械行为。为此，开发了一种高速定量偏振光显微镜（QPLM）仪器。该技术可以在受控的中高应变率实验期间​​以高达10 kHz的采集速率监视胶原纤维的空间重新排列。通过使用旋转的四分之一波片和高速照相机，生成双折射样品的对准图的最小采集时间为6.0 ms。顺序分析方法允许QPLM仪器通过10 kHz的高速摄像机生成QPLM数据。这款高速QPLM仪器在改进的吊塔内实施，并使用基准聚碳酸酯样品进行了验证。;使用改良的吊塔对猪的腱-骨插入标本进行了测试，以产生动态拉伸载荷，平均最大位移速率为1.24m / s。使用高速QPLM仪器跟踪胶原纤维的重新排列。结果表明，肌腱到骨的插入通过一系列局部变形减轻了动态应力条件的潜在影响。第一种方法由于生成对准图需要顺序图像而显示出一些局限性。因此，研究了测量样品双折射的第二种方法。带有线性偏振滤光片阵列的高速相机用于监测动态加载过程中腱到骨插入标本的胶原纤维重新排列。由于偏振分级器独立地为每个图像提供对准信息，因此消除了具有连续图像的要求。实验结果表明，使用高速偏振摄像机可以显着提高测量采集速度。该研究为研究胶原生物组织的机械行为和通过动态加载过程中局部胶原纤维的重新排列和断裂来检测生物组织的损伤提供了基础。

著录项

  • 作者

    Wu, Xianyu.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Mechanical engineering.;Biomechanics.;Electrical engineering.
  • 学位 Ph.D.
  • 年度 2018
  • 页码 103 p.
  • 总页数 103
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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