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Journal of Biomedical Optics

Deep optical imaging of tissue using the second and third near-infrared spectral windows
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Paper Abstract

Light at wavelengths in the near-infrared (NIR) region allows for deep penetration and minimal absorption through high scattering tissue media. NIR light has been conventionally used through the first NIR optical tissue window with wavelengths from 650 to 950 nm. Longer NIR wavelengths had been overlooked due to major water absorption peaks and a lack of NIR-CCD detectors. The second NIR spectral window from 1100 to 1350 nm and a new spectral window from 1600 to 1870 nm, known as the third NIR optical window, were investigated. Optical attenuation measurements from thin tissue slices of normal and malignant breast and prostate tissues, pig brain, and chicken tissue were obtained in the spectral range from 400 to 2500 nm. Optical images of chicken tissue overlying three black wires were also obtained using the second and third spectral windows. Due to a reduction in scattering and minimal absorption, longer attenuation lengths and clearer optical images could be seen in the second and third NIR optical windows compared to the conventional first NIR optical window. A possible fourth optical window centered at 2200 nm was noted.

Paper Details

Date Published: 7 May 2014
PDF: 6 pages
J. Biomed. Opt. 19(5) 056004 doi: 10.1117/1.JBO.19.5.056004
Published in: Journal of Biomedical Optics Volume 19, Issue 5
Show Author Affiliations
Laura A. Sordillo, The City College of New York (United States)
Yang Pu, The City College of New York (United States)
Sebastião Pratavieira, The City College of New York (United States)
Univ. de São Paulo (Brazil)
Yury Budansky, The City College of New York (United States)
Robert R. Alfano, The City College of New York (United States)

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