Evaluation of a fuzzy logic controller for laser thermal therapy

Vanessa Choy; Alireza Sadeghian; Michael D. Sherar; William Mark Whelan

doi:10.1117/12.472510

27 June 2002 Evaluation of a fuzzy logic controller for laser thermal therapy

Vanessa Choy, Alireza Sadeghian, Michael D. Sherar, William Mark Whelan

Proceedings Volume 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical; (2002) https://doi.org/10.1117/12.472510
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

Laser thermal therapy (LTT) is a minimally invasive surgical technique used to destroy solid tumors while minimizing damage to adjacent normal tissues. Optical energy, delivered through fibers implanted into the target volume, raises tissue temperatures above 60 degree(s)C resulting in coagulative necrosis (thermal damage). Thermal damage volumes, however, can be irregular and unpredictable, resulting from dynamic changes in the tissue properties during treatment. A closed-loop feedback fuzzy logic controller for LTT was developed with the tissue treated as a black-box system. Preliminary testing was conducted for simulated LTT with a single spherically emitting source fiber at the center of 5 mm and 10 mm diameter target tissues. Dynamic changes in blood perfusion and tissue optical properties due to heating were incorporated into the LTT simulator. Input laser power was modulated to control the temperature field in an attempt to reach target temperatures at the source (90 degree(s)C to avoid tissue charring) and at the target boundary (55 degree(s)C). In all simulations, thermal damage based on Arrhenius formulation ((Omega) equals 1) was reached at the target boundary. The controller also responded efficiently to unexpected, rapid temperature changes.

Citation Download Citation

Vanessa Choy, Alireza Sadeghian, Michael D. Sherar, and William Mark Whelan "Evaluation of a fuzzy logic controller for laser thermal therapy", Proc. SPIE 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, (27 June 2002); https://doi.org/10.1117/12.472510

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