Open AccessCorrection of image distortions in endoscopic optical coherence tomography based on two-axis scanning MEMS mirrors
Author(s) -
Donglin Wang,
Liang Peng,
Sean R. Samuelson,
Hongzhi Jia,
Junshan Ma,
Huikai Xie
Publication year - 2013
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.4.002066
Subject(s) - optical coherence tomography , optics , microelectromechanical systems , distortion (music) , fourier transform , optical axis , materials science , computer science , physics , optoelectronics , amplifier , cmos , quantum mechanics , lens (geology)
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.