Open AccessSpectral phase based k-domain interpolation for uniform sampling in swept-source optical coherence tomography
Author(s) -
Tong Wu,
Zhihua Ding,
Ling Wang,
MingHui Chen
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.018430
Subject(s) - optics , optical coherence tomography , interferometry , interpolation (computer graphics) , calibration , signal (programming language) , physics , phase (matter) , fourier transform , michelson interferometer , coherence (philosophical gambling strategy) , computer science , motion (physics) , classical mechanics , quantum mechanics , programming language
We propose an efficient direct k-domain interpolation based on spectral phase in swept-source optical coherence tomography (SS-OCT). Both the calibration signal from the Mach-Zehnder interferometer (MZI) and the OCT imaging signal from the Michelson interferometer sharing the same swept source are detected and digitized simultaneously. Sufficient sampling of the OCT imaging signal with uniform k interval are directly interpolated in the k-domain based on the spectral phase derived from MZI calibration signal. Depth profile is then obtained from Fourier transform of the k-domain interpolated data. In vivo imaging of human finger skin and nail fold are conducted. Reconstructed images corresponding to different calibration methods are evaluated for comparison. Experimental results demonstrate that improved imaging quality with enhanced resolution and signal-to-noise ratio is realized by the proposed method in contrast to the spectral phase based time-domain interpolation method as well as the intensity based calibration method.