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Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch
We describe a novel buffering technique for increasing the A-scan rate of swept source optical coherence tomography (SSOCT) systems employing low duty cycle swept source lasers. This technique differs from previously reported buffering techniques in that it employs a fast optical switch, capable of...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Optical Society of America
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3521311/ https://www.ncbi.nlm.nih.gov/pubmed/23243559 http://dx.doi.org/10.1364/BOE.3.003054 |
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author | Dhalla, Al-Hafeez Shia, Kevin Izatt, Joseph A. |
author_facet | Dhalla, Al-Hafeez Shia, Kevin Izatt, Joseph A. |
author_sort | Dhalla, Al-Hafeez |
collection | PubMed |
description | We describe a novel buffering technique for increasing the A-scan rate of swept source optical coherence tomography (SSOCT) systems employing low duty cycle swept source lasers. This technique differs from previously reported buffering techniques in that it employs a fast optical switch, capable of switching in 60 ns, instead of a fused fiber coupler at the end of the buffering stage, and is therefore appreciably more power efficient. The use of the switch also eliminates patient exposure to light that is not used for imaging that occurs at the end of the laser sweep, thereby increasing the system sensitivity. We also describe how careful management of polarization can remove undesirable artifacts due to polarization mode dispersion. In addition, we demonstrate how numerical compensation techniques can be used to modify the signal from a Mach-Zehnder interferometer (MZI) clock obtained from the original sweep to recalibrate the buffered sweep, thereby reducing the complexity of systems employing lasers with integrated MZI clocks. Combining these methods, we constructed an SSOCT system employing an Axsun technologies laser with a sweep rate of 100kHz and 6dB imaging range of 5.5mm. The sweep rate was doubled with sweep buffering to 200 kHz, and the imaging depth was extended to 9 mm using coherence revival. We demonstrated the feasibility of this system by acquiring images of the anterior segments and retinas of healthy human volunteers. |
format | Online Article Text |
id | pubmed-3521311 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Optical Society of America |
record_format | MEDLINE/PubMed |
spelling | pubmed-35213112012-12-14 Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch Dhalla, Al-Hafeez Shia, Kevin Izatt, Joseph A. Biomed Opt Express Optical Coherence Tomography We describe a novel buffering technique for increasing the A-scan rate of swept source optical coherence tomography (SSOCT) systems employing low duty cycle swept source lasers. This technique differs from previously reported buffering techniques in that it employs a fast optical switch, capable of switching in 60 ns, instead of a fused fiber coupler at the end of the buffering stage, and is therefore appreciably more power efficient. The use of the switch also eliminates patient exposure to light that is not used for imaging that occurs at the end of the laser sweep, thereby increasing the system sensitivity. We also describe how careful management of polarization can remove undesirable artifacts due to polarization mode dispersion. In addition, we demonstrate how numerical compensation techniques can be used to modify the signal from a Mach-Zehnder interferometer (MZI) clock obtained from the original sweep to recalibrate the buffered sweep, thereby reducing the complexity of systems employing lasers with integrated MZI clocks. Combining these methods, we constructed an SSOCT system employing an Axsun technologies laser with a sweep rate of 100kHz and 6dB imaging range of 5.5mm. The sweep rate was doubled with sweep buffering to 200 kHz, and the imaging depth was extended to 9 mm using coherence revival. We demonstrated the feasibility of this system by acquiring images of the anterior segments and retinas of healthy human volunteers. Optical Society of America 2012-10-31 /pmc/articles/PMC3521311/ /pubmed/23243559 http://dx.doi.org/10.1364/BOE.3.003054 Text en ©2012 Optical Society of America http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially. |
spellingShingle | Optical Coherence Tomography Dhalla, Al-Hafeez Shia, Kevin Izatt, Joseph A. Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title | Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title_full | Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title_fullStr | Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title_full_unstemmed | Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title_short | Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
title_sort | efficient sweep buffering in swept source optical coherence tomography using a fast optical switch |
topic | Optical Coherence Tomography |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3521311/ https://www.ncbi.nlm.nih.gov/pubmed/23243559 http://dx.doi.org/10.1364/BOE.3.003054 |
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