Dr. Xiaomei Wang Profile

Dr. Xiaomei Wang

at Shanghai Normal Univ

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Proceedings Article | 20 February 2020 Paper

Tissue temperature monitoring during laser vaporization through black body radiation at wavelengths less than 1.8 um

Paris Franz, Hui Zhu, Xiaomei Wang, Ray Chia, Tom Hasenberg, Hui Wang

Proceedings Volume 11238, 1123819 (2020) https://doi.org/10.1117/12.2545105

KEYWORDS: Temperature sensors, Fiber optics sensors, Laser ablation, Optical fibers, Short wave infrared radiation

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Laser vaporization is a surgical procedure which utilizes a high power laser to quickly heat and vaporize tissue. Laser vaporization can be conducted on internal organs, such as breast or prostate, through a fiber catheter. Compared with other surgical technologies, it has excellent hemostasis capability with minimal collateral tissue damage, which may reduce hospitalization time and postoperative complications. Accurately monitoring tissue temperature during laser vaporization procedures provides important feedback to surgeons to improve surgical outcomes. Tissue cannot be vaporized if the temperature is lower than the boiling point, while high temperatures may lead to carbonization over the tissue surface, which not only reduces vaporization efficiency but also leads to postsurgical complications. However, until now, no sensing technologies have been developed to monitor tissue temperature during routine laser vaporization in clinics. Here, we report the use of blackbody radiation in the short-wave infrared range (SWIR) for tissue temperature monitoring during laser vaporization. Although blackbody radiation in SWIR is very weak for temperatures less than 100°C, the relatively low water absorption and silica fiber attenuation may allow temperature sensing in vivo. We successfully detected blackbody radiation in SWIR down to 80°C through a 2 m silica fiber. We then proved the feasibility of using blackbody radiation in SWIR to monitor tissue temperature during laser vaporization through an ex vivo tissue study. The developed technology is low-cost and can be seamlessly integrated with the fiber catheter used in laser vaporization.

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