Broadband transmission spectroscopy in tissue: application to radiofrequency tissue fusion

Timmy Floume; Richard R. A. Syms; Ara W. Darzi; George B. Hanna

doi:10.1117/12.823091

18 May 2009 Broadband transmission spectroscopy in tissue: application to radiofrequency tissue fusion

Timmy Floume, Richard R. A. Syms, Ara W. Darzi, George B. Hanna

Proceedings Volume 7356, Optical Sensors 2009; 73562C (2009) https://doi.org/10.1117/12.823091
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

Radiofrequency tissue fusion consists in heating apposed tissue faces, which results in their sealing. Tissue transformations must be controlled to obtain reliable reproducible seal. In this paper we demonstrate how to extract information on the two main tissue transformations, thermal damage and dehydration, from continuous wave transmission spectra. A fibre based near infrared transmission spectroscopy system is presented and described theoretically. Show demonstrate that such system can be fully modeled using ray optics considerations for the coupling of the light into optical fibers, and MC simulations of light propagation in tissue. We then develop an algorithm based on the absolute measurement of attenuation and the modified Beer Lambert Law that enables the extraction of absolute tissue hydration and information on the degree of thermal damage, via scattering losses. We also discuss the basis and limit of absolute measurement during broadband submicronic tissue transmittance spectroscopy.

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Timmy Floume, Richard R. A. Syms, Ara W. Darzi, and George B. Hanna "Broadband transmission spectroscopy in tissue: application to radiofrequency tissue fusion", Proc. SPIE 7356, Optical Sensors 2009, 73562C (18 May 2009); https://doi.org/10.1117/12.823091

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KEYWORDS

Tissue optics

Tissues

Absorption

Scattering

Signal attenuation

Light scattering

Sensors

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