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报道了基于光纤型光学相干层析成像(OCT)的投影折射率计算机层析成像(PICT)系统,并利用研制的系统对外径为1.3 mm,内径为0.9 mm的充水玻璃管样品进行了测量。样品以1°的步进角旋转,共采集180个方向上的投影值,然后利用卷积反投影算法进行了折射率分布图像的重建。实验结果表明,系统具有较高的空间分辨率,能够正确区分空气、玻璃和水三种不同折射率的物质,且其边界清晰可辨;由于利用了折射率信息,投影折射率计算机层析图像消除了常规光学相干层析图像中的几何畸变。
The projection refractive index computed tomography (PICT) system based on optical fiber optical coherence tomography (OCT) was reported and a sample of water-filled glass tube with an outer diameter of 1.3 mm and an inner diameter of 0.9 mm was measured using the developed system . Samples were rotated at a 1 ° step angle and a total of 180 projection values were acquired. Then, the reconstruction of the refractive index distribution image was performed by the convolution backprojection algorithm. The experimental results show that the system has high spatial resolution, which can correctly distinguish three materials with different refractive indices, such as air, glass and water, and the boundaries are clearly distinguishable. Due to the use of refractive index information, the projection refractive index computer tomography Eliminates geometric distortion in conventional optical coherence tomographic images.