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An optical coherence tomography (OCT)-based air jet indentation system for measuring the mechanical properties of soft tissues

机译：基于光学相干断层扫描（OCT）的空气压痕系统，用于测量软组织的机械性能

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摘要

A novel noncontact indentation system with the combination of an air jet and optical coherence tomography (OCT) was presented in this paper for the quantitative measurement of the mechanical properties of soft tissues. The key idea of this method is to use a pressure-controlled air jet as an indenter to compress the soft tissue in a noncontact way and utilize the OCT signals to extract the deformation induced. This indentation system provides measurement and mapping of tissue elasticity for small specimens with high scanning speed. Experiments were performed on 27 silicone tissue-mimicking phantoms with different Young's moduli, which were also measured by uniaxial compression tests. The regression coefficient of the indentation force to the indentation depth (N mm~(-1)) was used as an indicator of the stiffness of tissue under air jet indentation. Results showed that the stiffness coefficients measured by the current system correlated well with the corresponding Young's moduli obtained by conventional mechanical testing (r velence 0.89, p < 0.001). Preliminary in vivo tests also showed that the change of soft tissue stiffness with and without the contraction of the underlying muscles in the hand could be differentiated by the current measurement. This system may have broad applications in tissue assessment and characterization where alterations of mechanical properties are involved, in particular with the potential of noncontact micro-indentation for tissues.
机译：本文提出了一种新颖的非接触式压痕系统，该系统结合了空气喷射和光学相干断层扫描（OCT），用于定量测量软组织的机械性能。该方法的关键思想是使用压力控制的空气射流作为压头，以非接触方式压缩软组织，并利用OCT信号提取引起的变形。该压痕系统可为具有高扫描速度的小样本提供组织弹性的测量和绘图。对27个具有不同杨氏模量的模仿有机硅组织的人体模型进行了实验，这些人体模型也通过单轴压缩测试进行了测量。压入力对压入深度的回归系数（N mm〜（-1））被用作空气压入下组织硬度的指标。结果表明，由当前系统测得的刚度系数与通过常规机械测试获得的相应杨氏模量具有很好的相关性（相对速度0.89，p <0.001）。初步的体内试验还表明，通过当前的测量可以区分手的软组织刚度随手掌下方肌肉的收缩与否而变化。该系统可能在涉及机械性能改变的组织评估和表征中具有广泛的应用，特别是具有组织非接触式微压痕的潜力。

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