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Spectral Domain Optical Coherence Tomography Imaging Performance Improvement Based on Field Curvature Aberration-Corrected Spectrometer

机译:基于现场曲率像差校正光谱仪的光谱域光学相干断层扫描成像性能改进

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We designed and fabricated a telecentric f-theta imaging lens (TFL) to improve the imaging performance of spectral domain optical coherence tomography (SD-OCT). By tailoring the field curvature aberration of the TFL, the flattened focal surface was well matched to the detector plane. Simulation results showed that the spot in the focal plane fitted well within a single pixel and the modulation transfer function at high spatial frequencies showed higher values compared with those of an achromatic doublet imaging lens, which are commonly used in SD-OCT spectrometers. The spectrometer using the TFL had an axial resolution of 7.8 μm, which was similar to the theoretical value of 6.2 μm. The spectrometer was constructed so that the achromatic doublet lens was replaced by the TFL. As a result, the SD-OCT imaging depth was improved by 13% (1.85 mm) on a 10 dB basis in the roll-off curve and showed better sensitivity at the same depth. The SD-OCT images of a multi-layered tape and a human palm proved that the TFL was able to achieve deeper imaging depth and better contrast. This feature was seen very clearly in the depth profile of the image. SD-OCT imaging performance can be improved simply by changing the spectrometer’s imaging lens. By optimizing the imaging lens, deeper SD-OCT imaging can be achieved with improved sensitivity.
机译:我们设计并制作了远心F-THETA成像镜头(TFL),以改善光谱域光学相干断层扫描(SD-OCT)的成像性能。通过定制TFL的场曲率像差,扁平的焦平面与探测器平面很好地匹配。模拟结果表明,与高温双板成像镜头相比,在单个像素内孔隙井的焦平面和调制传递函数的光谱显示较高的值,其通常用于SD-OCT光谱仪。使用TFL的光谱仪具有7.8μm的轴向分辨率,类似于6.2μm的理论值。构造光谱仪,使得消色差双晶体被TFL取代。结果,在滚关曲线中,SD-OCT成像深度在10dB的基础上提高了13%(1.85mm),并且在相同的深度下显示出更好的灵敏度。多层带和人掌的SD-OCT图像证明了TFL能够实现更深层的成像深度和更好的对比度。在图像的深度轮廓中非常清楚地看到了此功能。通过改变光谱仪的成像镜头,可以简单地改进SD-OCT成像性能。通过优化成像镜头,可以通过改善灵敏度来实现更深的SD-OCT成像。

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