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20 April 2017 Real-time temperature monitoring with fiber Bragg grating sensor during diffuser-assisted laser-induced interstitial thermotherapy
Ngot Thi Pham, Seul Lee Lee, Suhyun Park, Yong Wook Lee, Hyun Wook Kang
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Journal of Biomedical Optics, Vol. 22, Issue 4, 045008 (April 2017). https://doi.org/10.1117/1.JBO.22.4.045008
Abstract
High-sensitivity temperature sensors have been used to validate real-time thermal responses in tissue during photothermal treatment. The objective of the current study was to evaluate the feasible application of a fiber Bragg grating (FBG) sensor for diffuser-assisted laser-induced interstitial thermotherapy (LITT) particularly to treat tubular tissue disease. A 600-μm core-diameter diffuser was employed to deliver 980-nm laser light for coagulation treatment. Both a thermocouple and a FBG were comparatively tested to evaluate temperature measurements in ex vivo liver tissue. The degree of tissue denaturation was estimated as a function of irradiation times and quantitatively compared with light distribution as well as temperature development. At the closer distance to a heat source, the thermocouple measured up to 41% higher maximum temperature than the FBG sensor did after 120-s irradiation (i.e., 98.7°C±6.1°C for FBG versus 131.0°C±5.1°C for thermocouple; p<0.001). Ex vivo porcine urethra tests confirmed the real-time temperature measurements of the FBG sensor as well as consistently circumferential tissue denaturation after 72-s irradiation (coagulation thickness=2.2±0.3  mm). The implementation of FBG can be a feasible sensing technique to instantaneously monitor the temperature developments during diffuser-assisted LITT for treatment of tubular tissue structure.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE) 1083-3668/2017/$25.00 © 2017 SPIE
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Ngot Thi Pham, Seul Lee Lee, Suhyun Park, Yong Wook Lee, and Hyun Wook Kang "Real-time temperature monitoring with fiber Bragg grating sensor during diffuser-assisted laser-induced interstitial thermotherapy," Journal of Biomedical Optics 22(4), 045008 (20 April 2017). https://doi.org/10.1117/1.JBO.22.4.045008
Received: 6 December 2016; Accepted: 28 March 2017; Published: 20 April 2017
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KEYWORDS
Fiber Bragg gratings
Tissues
Temperature metrology
Diffusers
Laser tissue interaction
Liver
Sensors
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