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Special Section on Optical Diagnostic Imaging from Bench to Bedside Molecular Imaging

Widefield and high-resolution reflectance imaging of gold and silver nanospheres

[+] Author Affiliations
Nitin Nitin, David J. Javier, Darren M. Roblyer, Rebecca Richards-Kortum

Rice University, Department of Bioengineering, 6100 Main Street, Keck Hall, Suite 116, Houston, Texas 77005

J. Biomed. Opt. 12(5), 051505 (November 01, 2007). doi:10.1117/1.2800314
History: Received January 03, 2007; Revised August 07, 2007; Accepted September 14, 2007; Published November 01, 2007
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Metallic nanoparticles have unique optical properties that can be exploited for molecular imaging in tissue. Image contrast depends on the nature of the particles, properties of the target tissue, and the imaging system. Maximizing image contrast for a particular application requires an understanding of the interplay of these factors. We demonstrate an approach that integrates the use of reflectance spectroscopy and imaging of particles in water and various tissue phantoms to evaluate the expected image contrast. We illustrate the application of this methodology for gold and silver nanospheres targeted against a biomarker expressed in epithelial tissue; predictions of contrast properties using diffuse reflectance spectroscopy were compared with widefield and high-resolution images of labeled tissue phantoms. The results show that the predicted image contrast based on spectroscopy agrees well with widefield and high-resolution imaging, and illustrate that gold and silver nanospheres at subnanomolar concentration are sufficient to produce contrast in both imaging modes. However, the effective contrast achieved with a particular type of nanoparticle can differ dramatically depending on the imaging modality. The ability to predict and optimize image contrast properties is a crucial step in the effective use of these nanomaterials for biomedical imaging applications.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Nitin Nitin ; David J. Javier ; Darren M. Roblyer and Rebecca Richards-Kortum
"Widefield and high-resolution reflectance imaging of gold and silver nanospheres", J. Biomed. Opt. 12(5), 051505 (November 01, 2007). ; http://dx.doi.org/10.1117/1.2800314


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