Ms. Rosanna Chan Profile

Rosanna Chan

at Univ Health Network

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Proceedings Article | 26 February 2019 Presentation + Paper

Assessment of optical detection methods for coagulation-front monitoring photothermal therapy of prostate cancer

Carl Fisher, Robert Weersink, Alexander Gregor, Alyssa Goldstein, Liang Lim, Michael Valic, Juan Chen, Rosanna Chan, Gang Zheng, Brian Wilson

Proc. SPIE. 10852, Therapeutics and Diagnostics in Urology 2019

KEYWORDS: Optical fibers, Laser therapeutics, Tissues, Magnetic resonance imaging, Thermometry, Prostate, Prostate cancer, In vivo imaging, Tissue optics

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Minimally-invasive alternatives for prostate cancer treatment are an unmet clinical need. We are currently conducting clinical trials using interstitial photothermal therapy (PTT) in focal (intermediate-risk) prostate cancer, targeting the largest (index) lesion, utilizing near-infrared (NIR) laser light that is delivered via one or more laser fibers placed interstitially to cover the target volume. This procedure is done using an interventional MRI suite where real-time MR thermometry is used to monitor treatment progression as a surrogate for tissue coagulation. We investigate here if photoacoustic imaging (PAI) could be used instead of MR thermometry to provide direct and higher specificity/sensitivity monitoring of the coagulation-front, particularly for the purpose of avoiding rectal wall damage. For this, we developed an in vivo canine PTT model and experiments were performed in 6 beagles with intact normal prostates, using similar approaches to those used in ongoing clinical trials. PTT also performed in vivo as well as in ex vivo porcine muscle. Initial results demonstrated the feasibility of both the PTT technique as well as an optimized monitoring platform. In ex vivo porcine muscle PAI demonstrated correlation with temperature (R² = 0.66) that provided the impetus to move in vivo. However, due to noise and the relatively small changes in the PAI signal with coagulation this did not provide as much imaging depth or resolution as MR thermometry, the current gold standard. With newer PAI probes and deployment of the PAI light sources, it may be possible to increase the sensitivity of PAI for in vivo treatment monitoring. This work was supported by the Terry Fox Research Institute (Grant #1075).

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