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Journal of Biomedical Optics

Optical fiber sensors-based temperature distribution measurement in ex vivo radiofrequency ablation with submillimeter resolution
Author(s): Edoardo G. Macchi; Daniele Tosi; Giovanni Braschi; Mario Gallati; Alfredo Cigada; Giorgio Busca; Elfed Lewis
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Paper Abstract

Radiofrequency thermal ablation (RFTA) induces a high-temperature field in a biological tissue having steep spatial (up to 6°C/mm) and temporal (up to 1°C/s) gradients. Applied in cancer care, RFTA produces a localized heating, cytotoxic for tumor cells, and is able to treat tumors with sizes up to 3 to 5 cm in diameter. The online measurement of temperature distribution at the RFTA point of care has been previously carried out with miniature thermocouples and optical fiber sensors, which exhibit problems of size, alteration of RFTA pattern, hysteresis, and sensor density worse than 1  sensor/cm. In this work, we apply a distributed temperature sensor (DTS) with a submillimeter spatial resolution for the monitoring of RFTA in porcine liver tissue. The DTS demodulates the chaotic Rayleigh backscattering pattern with an interferometric setup to obtain the real-time temperature distribution. A measurement chamber has been set up with the fiber crossing the tissue along different diameters. Several experiments have been carried out measuring the space-time evolution of temperature during RFTA. The present work showcases the temperature monitoring in RFTA with an unprecedented spatial resolution and is exportable to in vivo measurement; the acquired data can be particularly useful for the validation of RFTA computational models

Paper Details

Date Published: 11 November 2014
PDF: 7 pages
J. Biomed. Opt. 19(11) 117004 doi: 10.1117/1.JBO.19.11.117004
Published in: Journal of Biomedical Optics Volume 19, Issue 11
Show Author Affiliations
Edoardo G. Macchi, Univ. degli Studi di Pavia (Italy)
Daniele Tosi, Univ. of Limerick (Ireland)
Giovanni Braschi, Univ. degli Studi di Pavia (Italy)
Mario Gallati, Univ. degli Studi di Pavia (Italy)
Alfredo Cigada, Politecnico di Milano (Italy)
Giorgio Busca, Politecnico di Milano (Italy)
Elfed Lewis, Univ. of Limerick (Ireland)

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