title: Common approach for compensation of axial motion artifacts in swept-source OCT and dispersion in Fourier-domain OCT.
abstract: Swept-source optical coherence tomography (SS-OCT) is sensitive to sample motion during the wavelength sweep, which leads to image blurring and image artifacts. In line-field and full-field SS-OCT parallelization is achieved by using a line or area detector, respectively. Thus, approximately 1000 lines or images at different wavenumbers are acquired. The sweep duration is identically with the acquisition time of a complete B-scan or volume, rendering parallel SS-OCT more sensitive to motion artifacts than scanning OCT. The effect of axial motion on the measured spectra is similar to the effect of non-balanced group velocity dispersion (GVD) in the interferometer arms. It causes the apparent optical path lengths in the sample arm to vary with the wavenumber. Here we propose the cross-correlation of sub-bandwidth reconstructions (CCSBR) as a new algorithm that is capable of detecting and correcting the artifacts induced by axial motion in line-field or full-field SS-OCT as well as GVD mismatch in any Fourier-domain OCT (FD-OCT) setup. By cross-correlating images which were reconstructed from a limited spectral range of the interference signal, a phase error is determined which is used to correct the spectral modulation prior to the calculation of the A-scans. Performance of the algorithm is demonstrated on in vivo full-field SS-OCT images of skin and scanning FD-OCT of skin and retina.
authors.affiliation: Thorlabs GmbH, Maria-Goeppert-Str. 1, 23562 Lubeck, Germany. dhillmann@thorlabs.com
authors.forename: Dierck
authors.initials: D
authors.lastname: Hillmann
authors.forename: Tim
authors.initials: T
authors.lastname: Bonin
authors.forename: Christian
authors.initials: C
authors.lastname: Lührs
authors.forename: Gesa
authors.initials: G
authors.lastname: Franke
authors.forename: Martin
authors.initials: M
authors.lastname: Hagen-Eggert
authors.forename: Peter
authors.initials: P
authors.lastname: Koch
authors.forename: Gereon
authors.initials: G
authors.lastname: Hüttmann
mesh_terms: D000465:Algorithms; D016477:Artifacts; D005583:Fourier Analysis; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009038:Motion; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000379:methods*