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利用基于蒙特卡罗方法的牙组织光学相干层析(OCT)成像模型,研究了不同牙组织的OCT非失真成像深度。通过模拟入射高斯光束以及光在牙组织中的传输,分别获得了单层牙釉质、单层牙本质以及两层牙组织结构的二维仿真OCT图像,与实验结果具有定性的一致性。通过分析二维仿真OCT图像所对应的一维OCT信号,分别得到了三种牙组织结构的平均非失真成像光学深度。研究结果表明,OCT系统对牙齿组织的非失真成像光学深度在150~2400μm之间,其中牙釉质的非失真成像深度要远大于牙本质的成像深度。所得的结果对于在实验中利用OCT图像对组织结构有效信息进行判断具有一定的参考价值。
Using OCT imaging model based on Monte Carlo method, the depth of non-distorted OCT images of different tooth tissues was studied. By simulating the incident Gaussian beam and the transmission of light in the tooth tissue, the two-dimensional simulated OCT images of single layer enamel, single layer dentin and two layers of tooth structure were obtained, which were qualitatively consistent with the experimental results. By analyzing the one-dimensional OCT signals corresponding to the two-dimensional simulation OCT images, the average non-distorted imaging optical depths of the three kinds of tooth tissue structures are respectively obtained. The results show that the optical depth of non-distorted imaging of tooth tissue by OCT system is between 150 ~ 2400μm, in which the non-distorted imaging depth of enamel is much larger than the imaging depth of dentin. The results obtained for the use of OCT images in the experiment to determine the effective structure of tissue information has some reference value.