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Signal to noise ratio in an OCT/confocal system and penetration depth in OCT

Podoleanu, Adrian G.H., Cucu, Radu G., Jackson, David A. (2001) Signal to noise ratio in an OCT/confocal system and penetration depth in OCT. In: SPIE Proceedings Series. 4251. pp. 11-20. Spie-Int Soc Optical Engineering (doi:10.1117/12.427890) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.dx.doi.org/10.1117/12.427890

Abstract

An OCT system is built around a confocal optical receiver by adding a reference beam to the beam returned from the target tissue to the photodetector. The amount of light collected by the OCT receiver (both signal and background signal) depends on the parameters of the confocal receiver. We are interested in a configuration that allows the simultaneous display of the confocal signal and the OCT signal, which requires a separate confocal channel in the system. In this case, the S/N performance is different in the two channels and depends on the optical configuration used. The paper discusses the noise sources in the two channels. S/N ratios are numerically evaluated for cases of experimental interest. As far as the penetration depth in OCT is concerned, a value of 20 optical depths was considered achievable in previous reports if only the shot noise was considered. We correct this value by taking into account the excess photon noise and the limitations imposed by the safety power limits. Multiple scattering determines an increase in noise via the excess photon noise term.

Item Type: Conference or workshop item (Proceeding)
DOI/Identification number: 10.1117/12.427890
Uncontrolled keywords: Confocal optics ; Multiple scattering ; Photodetectors ; Photons ; Receivers ; Safety ; Signal to noise ratio ; Tissues
Subjects: R Medicine > R Medicine (General) > R857.O6 Optical coherence tomography
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Giles Tarver
Date Deposited: 27 Jul 2015 09:37 UTC
Last Modified: 29 May 2019 14:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49808 (The current URI for this page, for reference purposes)
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