Fully distributed chirped FBG sensor and application in laser-induced interstitial thermotherapy

Chenglin Li; Na Chen; Zhenyi Chen; Tingyun Wang

doi:10.1117/12.852040

25 November 2009 Fully distributed chirped FBG sensor and application in laser-induced interstitial thermotherapy

Chenglin Li, Na Chen, Zhenyi Chen, Tingyun Wang

Proceedings Volume 7634, Optical Sensors and Biophotonics; 76340D (2009) https://doi.org/10.1117/12.852040
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

In the laser induced interstitial thermotherapy (LITT), real-timely detecting the temperature distribution of the cured tissue is a bottleneck. In this paper, a fully distributed chirped Fiber Bragg grating (FBG) sensor, which is of small size, immune from electromagnetic interference (EMI) and high sensitivity, is proposed to solve this problem. An experiment simulation of LITT is set up, and only one chirped FBG is used to detect the dynamic spectral variation with different laser power. Meanwhile, a high-efficiency spectra inversion algorithm named MSAE of FBG is utilized to demodulate the system and obtain the temperature distribution. The spatial resolution is 0.25mm and the running time of demodulation is tens of seconds, which can help doctors control the laser parameters such as the laser power and the treatment time to guarantee the security of the therapy.

Citation Download Citation

Chenglin Li, Na Chen, Zhenyi Chen, and Tingyun Wang "Fully distributed chirped FBG sensor and application in laser-induced interstitial thermotherapy", Proc. SPIE 7634, Optical Sensors and Biophotonics, 76340D (25 November 2009); https://doi.org/10.1117/12.852040

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