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 due to concentration variations affect the OCT image and then define a dosing range that would result in appropriate scattering coefficient, , to maintain an acceptable signal attenuation level. Our results show that an increase in sample not only enhances the OCT signal near the surface but also attenuates the signal deeper into the sample. We synthesized gold nanoshells with an radius silica core and shell thickness and found that a concentration range of provided adequate signal enhancement near the surface without severely compromising the imaging depth due to signal attenuation. We also demonstrate the extraction of from the OCT signal to estimate the gold nanoshells’ concentration in vivo and verified that the estimated concentration of in a mouse tumor after intravenous delivery lies within this concentration range to effectively enhance the tumor image.
© 2009 Optical Society of America
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