Abstract
A two-axis scanning microelectromechanical (MEMS) mirror enables an optical coherence tomography (OCT) system to perform three-dimensional endoscopic imaging due to its fast scan speed and small size. However, the radial scan from the MEMS mirror causes various distortions in OCT images, namely spherical, fan-shaped and keystone distortions. In this paper, a new method is proposed to correct all of three distortions presented in OCT systems based on two-axis MEMS scanning mirrors. The spherical distortion is corrected first by directly manipulating the original spectral interferograms in the phase domain, followed by Fourier transform and three-dimensional geometrical transformation for correcting the other two types of distortions. OCT imaging experiments on a paper with square ink printed arrays and a glass tube filled with milk have been used to validate the proposed method. Distortions in OCT images of flat or curved surfaces can all be effectively removed.
Highlights
Optical coherence tomography (OCT) uses interference signals generated by the backscattered light from a sample and a reference mirror to obtain the structural information of the sample at various depths [1]
Since an OCT interferogram is encoded with optical path length difference, the OCT image will be distorted by the radial optical scan path from the Micro-Electro-Mechanical System (MEMS) mirror [8]
We propose a new method to correct distorted OCT images by directly processing the original interferogram spectral data
Summary
Optical coherence tomography (OCT) uses interference signals generated by the backscattered light from a sample and a reference mirror to obtain the structural information of the sample at various depths [1]. Most distortion correction algorithms are based on a point-to-point mapping method [9,10,11] This method is universal, it needs a complicated mapping process and can only be applied after the original interferogram data are converted to the structural image [12]. Applying this method to correct scanning distortion will consume a lot of computing resource and can hardly approach real-time display. We propose a new method to correct distorted OCT images by directly processing the original interferogram spectral data It is a more fundamental and simpler method and consumes much less computing resource which is critical for real-time highresolution image display
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