Detection of localized inclusions of gold ...

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Title Detection of localized inclusions of gold nanoparticles in Intralipid-1% by point-radiance spectroscopy
Author(s) S. Grabtchak, T. J. Palmer, W. M. Whelan
Journal Journal of Biomedical Optics
Date 2011
Volume 16
Issue 7
Start page 077003
Abstract Interstitial fiber-optic-based approaches used in both diagnostic and therapeutic applications rely on localized light-tissue interactions. We present an optical technique to identify spectrally and spatially specific exogenous chromophores in highly scattering turbid media. Point radiance spectroscopy is based on directional light collection at a single point with a side-firing fiber that can be rotated up to 360 deg. A side firing fiber accepts light within a well-defined, solid angle, thus potentially providing an improved spatial resolution. Measurements were performed using an 800-mum diameter isotropic spherical diffuser coupled to a halogen light source and a 600 mum, approximately 43 deg cleaved fiber (i.e., radiance detector). The background liquid-based scattering phantom was fabricated using 1% Intralipid. Light was collected with 1 deg increments through 360 deg-segment. Gold nanoparticles , placed into a 3.5-mm diameter capillary tube were used as localized scatterers and absorbers introduced into the liquid phantom both on- and off-axis between source and detector. The localized optical inhomogeneity was detectable as an angular-resolved variation in the radiance polar plots. This technique is being investigated as a potential noninvasive optical modality for prostate cancer monitoring.
DOI 10.1117/1.3597624

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