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19 February 2010 Optical coherence tomography resolution improvement by step-frequency encoding
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A novel technique for axial resolution improvement of Optical Coherence Tomography (OCT) systems is presented. The technique is based on step-frequency encoding of the OCT signal, using frequency shifting. A resolution improvement by a factor of ~ 7 is achieved without the need for a broader bandwidth light source. This method exploits a combination of two basic principles: the appearance of beating, when adding two signals of slightly different carrier frequencies, and the resolution improvement of OCT images by deconvolution of the interferogram with the encoded source autocorrelation function. In OCT, step-frequency encoding can be implemented by performing two A-scans, with different carrier frequencies and subsequently adding them to create the encoded signal. Deconvolution of the resulting interferogram, using appropriate kernels, results in a narrower resolution width when the frequency steps are appropriately selected.
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Evgenia Bousi, Ismini Charalambous, and Costas Pitris "Optical coherence tomography resolution improvement by step-frequency encoding", Proc. SPIE 7554, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV, 75541W (19 February 2010);

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