Abstract
Photoacoustic imaging can be used to guide and validate the therapeutic outcome of nanoparticle-mediated photothermal therapy through its ability to visualize the delivery of nanoparticle contrast agents, image the temperature distribution inside living tissue, and confirm tissue coagulation. In this image-guided process, temperature mapping plays a critical role for thermal dosage control. Therefore, developing a sensitive and accurate photoacoustic technique to quantitatively measure the temperature distribution during thermal therapy is essential. In this study, we investigated and demonstrated that silica-coated gold nanorods, can provide a multi-fold improvement in sensitivity of the photoacoustic temperature mapping compared to gold nanorods without silica coating, and serve as a nanothermal sensor to accurately and quantitatively visualize temperature distributions during photothermal therapy.
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