Tosi, D,Macchi, EG,Braschi, G,Cigada, A,Gallati, M,Rossi, S,Poeggel, S,Leen, G,Lewis, E

2014

April

Applied Optics

Fiber-optic combined FPI/FBG sensors for monitoring of radiofrequency thermal ablation of liver tumors: ex vivo experiments

Published

()

SMALL HEPATOCELLULAR-CARCINOMA MICROWAVE COAGULATION THERAPY RADIO-FREQUENCY ABLATION OPTICAL-FIBER PRESSURE PRINCIPLES DIAPHRAGM

53

2136

2144

We present a biocompatible, all-glass, 0.2 mm diameter, fiber-optic probe that combines an extrinsic Fabry-Perot interferometry and a proximal fiber Bragg grating sensor; the probe enables dual pressure and temperature measurement on an active 4 mm length, with 40 Pa and 0.2 degrees C nominal accuracy. The sensing system has been applied to monitor online the radiofrequency thermal ablation of tumors in liver tissue. Preliminary experiments have been performed in a reference chamber with uniform heating; further experiments have been carried out on ex vivo porcine liver, which allowed the measurement of a steep temperature gradient and monitoring of the local pressure increase during the ablation procedure. (C) 2014 Optical Society of America

10.1364/AO.53.002136