Spatially resolved, diffuse reflectance imaging for subsurface pattern visualization toward development of a lensless imaging platform: phantom experiments

Irina Schelkanova; Aditya Pandya; Guennadi Saiko; Lidia Nacy; Hannan Babar; Duoaud F. Shah; Lothar Lilge; Alexandre Douplik

doi:10.1117/1.JBO.21.1.015004

14 January 2016 Spatially resolved, diffuse reflectance imaging for subsurface pattern visualization toward development of a lensless imaging platform: phantom experiments

Irina Schelkanova, Aditya Pandya, Guennadi Saiko, Lidia Nacy, Hannan Babar, Duoaud F. Shah, Lothar Lilge, Alexandre Douplik

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Journal of Biomedical Optics, Vol. 21, Issue 1, 015004 (January 2016). https://doi.org/10.1117/1.JBO.21.1.015004

Abstract

A portable, spatially resolved, diffuse reflectance lensless imaging technique based on the charge-coupled device or complementary metal-oxide semiconductor sensor directly coupled to the fiber optic bundle is proposed for visualization of subsurface structures such as superficial microvasculature in the epithelium. We discuss an experimental method for emulating a lensless imaging setup via raster scanning a single fiber-optic cable over a microfluidic phantom containing periodic hemoglobin absorption contrast. To evaluate the ability of the technique to recover information about the subsurface linear structures, scattering layers formed of the Sylgard® 184 Silicone Elastomer and titanium dioxide were placed atop the microfluidic phantom. Thickness of the layers ranged from 0.2 to 0.7 mm, and the values of the reduced scattering coefficient (μ_s′) were between 0.85 and 4.25 mm−¹. The results demonstrate that fiber-optic, lensless platform can be used for two-dimensional imaging of absorbing inclusions in diffuse reflectance mode. In these experiments, it was shown that diffuse reflectance imaging can provide sufficient spatial sampling of the phantom for differentiation of 30 μm structural features of the embedded absorbing pattern inside the scattering media.

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Irina Schelkanova, Aditya Pandya, Guennadi Saiko, Lidia Nacy, Hannan Babar, Duoaud F. Shah, Lothar Lilge, and Alexandre Douplik "Spatially resolved, diffuse reflectance imaging for subsurface pattern visualization toward development of a lensless imaging platform: phantom experiments," Journal of Biomedical Optics 21(1), 015004 (14 January 2016). https://doi.org/10.1117/1.JBO.21.1.015004

Published: 14 January 2016

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