title: Correction of image distortions in endoscopic optical coherence tomography based on two-axis scanning MEMS mirrors.
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.
authors.affiliation: Engineering Research Center of Optical Instrument and System, University of Shanghai for Science and Technology, Shanghai 200093, China ; WiO Technology Ltd., Co., Wuxi 214135, Jiangsu, China.
authors.forename: Donglin
authors.initials: D
authors.lastname: Wang
authors.forename: Peng
authors.initials: P
authors.lastname: Liang
authors.forename: Sean
authors.initials: S
authors.lastname: Samuelson
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Jia
authors.forename: Junshan
authors.initials: J
authors.lastname: Ma
authors.forename: Huikai
authors.initials: H
authors.lastname: Xie
keywords: (100.6890) Three-dimensional image processing; (110.4500) Optical coherence tomography; (230.4685) Optical microelectromechanical devices