YANG Fan,LIU Lian-sheng,ZHAI Zuo-pan,et al.Distortion analysis and reconstruction of OCT image in sector scan mode[J].Optics and Precision Engineering,2021,29(08):1968-1975.
YANG Fan,LIU Lian-sheng,ZHAI Zuo-pan,et al.Distortion analysis and reconstruction of OCT image in sector scan mode[J].Optics and Precision Engineering,2021,29(08):1968-1975. DOI: 10.37188/OPE.20212908.1968.
Distortion analysis and reconstruction of OCT image in sector scan mode
In order to solve the problem of image distortion in sector scan mode by optical coherence tomography (OCT), this study investigates the causes, provides a quantitative analysis, and proposes a rectification and reconstruction algorithm for the OCT images in sector scan mode. First, based on the maximization of interclass variance (OTSU) algorithm, a preprocessing of denoise and enhancement was applied to the original image, thereby facilitating the reduction of the influence of background noise on image reconstruction. Thereafter, a mapping relationship between the original OCT image and the reconstructed image was established, thus, achieving the rectification of the distorted OCT image. Here, we took advantage of the OCT system to make a glass sample from the images in sector scan mode and measured the thickness and width of the glass sample after rectifying the images. On comparing the measured values with the actual ones, we found that the measured thickness error ranges between
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0.012 mm and 0.053 mm, and the measured width error ranges from
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0.107 mm to 0.045 mm. Furthermore, taking the eyes of pigs in vitro as the sample, we made a comparison between the measurement results in the rectangular scan mode to that in the sector scan mode and found that the measured thickness error of corneas range between
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0.022 mm and 0.014 mm, and the measured width error of irises range from
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0.121 mm to
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0.015 mm. Thus, the proposed method reduces the background noise of OCT images and corrects the image distortion effectively. This is of great significance for the application of OCT in sector scan mode, especially, in the field of medical diagnosis and surgical navigation.
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