Freehand OCT with real-time lateral motion tracking

Xuan Liu; Yong Huang; Peter Gehlbach; Jin U. Kang

doi:10.1117/12.2006973

20 March 2013 Freehand OCT with real-time lateral motion tracking

Xuan Liu, Yong Huang, Peter Gehlbach, Jin U. Kang

Proceedings Volume 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII; 85711P (2013) https://doi.org/10.1117/12.2006973
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

Freehand optical coherence tomography (OCT) systems without mechanical scanners can offer greater freedom to access and image sites of interest. However, the scanning velocity during freehand scan is irregular; therefore pseudo B-scan images obtained by stacking sequentially acquired A-scans have a non-uniform spatial sampling rate in the lateral dimension. In this study, we developed a speckle decorrelation method to estimate lateral displacement between sequentially acquired A-scans and used the information extracted from speckle analysis to correct the time-varying lateral scanning speed. We applied this method to a handheld OCT probe and performed calibration experiments to validate our model. Furthermore we demonstrated distortion-free, freehand OCT imaging of various samples including human tissue, in vivo.

Citation Download Citation

Xuan Liu, Yong Huang, Peter Gehlbach, and Jin U. Kang "Freehand OCT with real-time lateral motion tracking", Proc. SPIE 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII, 85711P (20 March 2013); https://doi.org/10.1117/12.2006973

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KEYWORDS

Optical coherence tomography

Speckle

Distortion

Signal processing

Eye

Scanners

Signal detection

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