Improvement of lateral resolution of optical coherence tomography images based on capon estimation of weighted multi-scatterer contributions

Evgenia Bousi; Costas Pitris

doi:10.1117/12.2007003

20 March 2013 Improvement of lateral resolution of optical coherence tomography images based on capon estimation of weighted multi-scatterer contributions

Evgenia Bousi, Costas Pitris

Author Affiliations +

Proceedings Volume 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII; 85710W (2013) https://doi.org/10.1117/12.2007003
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

A new method for lateral resolution improvement of Optical Coherence Tomography (OCT) images is presented. The improvement is independent of the delivery optics and the depth of focus. It is based on the lateral oversampling of the image. In OCT, laterally oversampled signals are backscattered signals from shifted and overlapped resolution volumes. In that way, signals from successive volumes are correlated due to the region shared by adjacent resolution volumes. Resolution can be improved by utilizing the cross correlation of signals from such overlapped volumes. The resolution can be improved by various degrees depending on which pairs of signals are used. In this method signals from all overlapped volumes are combined optimally to improve the resolution using all the available cross correlations. Preliminary results of such an approach on laterally oversampled OCT images have shown that it is possible to achieve a 3.7-fold lateral resolution improvement.

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Evgenia Bousi and Costas Pitris "Improvement of lateral resolution of optical coherence tomography images based on capon estimation of weighted multi-scatterer contributions", Proc. SPIE 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII, 85710W (20 March 2013); https://doi.org/10.1117/12.2007003

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KEYWORDS

Optical coherence tomography

Point spread functions

Image resolution

Signal to noise ratio

Deconvolution

Image filtering

Optical resolution

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