Comparison of uniform resampling and nonuniform sampling direct-reconstruction methods in k-space for FD-OCT  

作　　者：Yanrong Yang Yun Dai Yuehua Zhou Yaliang Yang 

机构地区：[1]College of Ophthalmology Chengdu University of Traditional Chinese Medicine Chengdu 610075,P.R.China [2]Institute of Optics and Electronics,Chinese Academy of Sciences Chengdu 610209,P.R.China [3]Key Laboratory of Adaptive Optics,Chinese Academy of Sciences Chengdu 610209,P.R.China [4]Key Laboratory of Sichuan Province Ophthalmopathy Prevention&Cure and Visual Function Protection with TCM Chengdu 610075,P.R.China [5]Ineye Hospital of Chengdu University of TCM Chengdu 610075,P.R.China

出　　处：《Journal of Innovative Optical Health Sciences》2023年第5期93-106,共14页创新光学健康科学杂志（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61575205 and 62175022);Sichuan Natural Science Foundation(2022NSFSC0803);Sichuan Science and Technology Program(2021JDRC0035).

摘　　要：The nonuniform distribution of interference spectrum in wavenumber k-space is a key issue to limit the imaging quality of Fourier-domain optical coherence tomography(FD-OCT).At present,the reconstruction quality at different depths among a variety of processing methods in k-space is still uncertain.Using simulated and experimental interference spectra at different depths,the effects of common six processing methods including uniform resampling(linear interpolation(LI),cubic spline interpolation(CSI),time-domain interpolation(TDI),and K-B window convolution)and nonuniform sampling direct-reconstruction(Lomb periodogram(LP)and nonuniform discrete Fourier transform(NDFT))on the reconstruction quality of FD-OCT were quantitatively analyzed and compared in this work.The results obtained by using simulated and experimental data were coincident.From the experimental results,the averaged peak intensity,axial resolution,and signal-to-noise ratio(SNR)of NDFT at depth from 0.5 to 3.0mm were improved by about 1.9 dB,1.4 times,and 11.8 dB,respectively,compared to the averaged indices of all the uniform resampling methods at all depths.Similarly,the improvements of the above three indices of LP were 2.0 dB,1.4 times,and 11.7 dB,respectively.The analysis method and the results obtained in this work are helpful to select an appropriate processing method in k-space,so as to improve the imaging quality of FD-OCT.

关 键 词：Optical coherence tomography signal processing uniform resampling nonuniform sampling direct-reconstruction reconstruction quality. 

分 类 号：R318[医药卫生—生物医学工程]