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Proceedings Paper

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

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.

Paper Details

Date Published: 20 February 2020
PDF: 7 pages
Proc. SPIE 11238, Optical Interactions with Tissue and Cells XXXI, 1123819 (20 February 2020); doi: 10.1117/12.2545105
Show Author Affiliations
Paris Franz, Miami Univ. (United States)
Stanford Univ. (United States)
Hui Zhu M.D., The Cleveland Clinic Foundation (United States)
Xiaomei Wang, Shanghai Normal Univ. (China)
Ray Chia, Boston Scientific Corp. (United States)
Tom Hasenberg, Boston Scientific Corp. (United States)
Hui Wang, Miami Univ. (United States)

Published in SPIE Proceedings Vol. 11238:
Optical Interactions with Tissue and Cells XXXI
Bennett L. Ibey; Norbert Linz, Editor(s)

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