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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 6 — May. 26, 2009

Concentration dependence of gold nanoshells on the enhancement of optical coherence tomography images: a quantitative study

James Chen Yong Kah, Tzu Hao Chow, Beng Koon Ng, Sirajudeen Gulam Razul, Malini Olivo, and Colin James Richard Sheppard  »View Author Affiliations


Applied Optics, Vol. 48, Issue 10, pp. D96-D108 (2009)
http://dx.doi.org/10.1364/AO.48.000D96


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Abstract

The effective use of gold nanoshells as a contrast agent for optical coherence tomography (OCT) may be hampered by the delivery of a wrong dose to tissue that results in unwanted signal attenuation. In this study we examine how changes in μ s due to concentration variations affect the OCT image and then define a dosing range that would result in appropriate scattering coefficient, μ s , to maintain an acceptable signal attenuation level. Our results show that an increase in sample μ s not only enhances the OCT signal near the surface but also attenuates the signal deeper into the sample. We synthesized gold nanoshells with an 81 nm radius silica core and 23 nm shell thickness and found that a concentration range of 5.6 × 10 9 < c < 2.3 × 10 10 particles / ml provided adequate signal enhancement near the surface without severely compromising the imaging depth due to signal attenuation. We also demonstrate the extraction of μ s from the OCT signal to estimate the gold nanoshells’ concentration in vivo and verified that the estimated concentration of 6.2 × 10 9 particles / ml in a mouse tumor after intravenous delivery lies within this concentration range to effectively enhance the tumor image.

© 2009 Optical Society of America

OCIS Codes
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(160.4236) Materials : Nanomaterials

History
Original Manuscript: September 3, 2008
Revised Manuscript: December 28, 2008
Manuscript Accepted: January 2, 2009
Published: January 30, 2009

Virtual Issues
Vol. 4, Iss. 6 Virtual Journal for Biomedical Optics

Citation
James Chen Yong Kah, Tzu Hao Chow, Beng Koon Ng, Sirajudeen Gulam Razul, Malini Olivo, and Colin James Richard Sheppard, "Concentration dependence of gold nanoshells on the enhancement of optical coherence tomography images: a quantitative study," Appl. Opt. 48, D96-D108 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-48-10-D96

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