This chapter presents design guidelines and an initial experimental assessment of a microwave imaging system to monitor liver ablation treatments. The hypothesis at the basis of using microwave imaging for real-time monitoring of thermal ablation procedures is related to the change of the tissue dielectric properties during the treatment. Firstly, the optimal working conditions in terms of operating frequency and dielectric properties of the coupling medium in which the MWI antennas are embedded are determined. In this respect, a general approach based on the use of transmission lines is used. Secondly, a compact slot-loaded antipodal Vivaldi antenna is designed within the proposed working conditions, realized, and experimentally assessed. Following a previous in-silico assessment of a possible experimental arrangement, a simple yet representative experimental set-up for the validation of the imaging system is considered. The set-up foresees 8 antennas inserted inside a tank filled with the coupling material; in front of the antenna array, a 3-D printed ellipsoidal phantom filled with tissue-mimicking liquid represents the thermally ablated zone. The proposed system is experimentally assessed with one antenna mechanically moved in a linear motion and measuring the signal in absence and in the presence of the 3-D printed phantom. The retrieved images inside the region of interest show that the designed system is able to detect the position of the ablated zone. The experimental results show the feasibility of the developed system for liver ablation monitoring that might be useful for new researchers to understand the challenges involved.

An initial assessment of a microwave imaging system to monitor microwave ablation treatments / Wang, M.; Cavagnaro, M.; Scapaticci, R.; Costanzo, S.; Crocco, L.. - (2023), pp. 331-356. - LECTURE NOTES IN BIOENGINEERING. [10.1007/978-3-031-28666-7_11].

An initial assessment of a microwave imaging system to monitor microwave ablation treatments

Cavagnaro M.;
2023

Abstract

This chapter presents design guidelines and an initial experimental assessment of a microwave imaging system to monitor liver ablation treatments. The hypothesis at the basis of using microwave imaging for real-time monitoring of thermal ablation procedures is related to the change of the tissue dielectric properties during the treatment. Firstly, the optimal working conditions in terms of operating frequency and dielectric properties of the coupling medium in which the MWI antennas are embedded are determined. In this respect, a general approach based on the use of transmission lines is used. Secondly, a compact slot-loaded antipodal Vivaldi antenna is designed within the proposed working conditions, realized, and experimentally assessed. Following a previous in-silico assessment of a possible experimental arrangement, a simple yet representative experimental set-up for the validation of the imaging system is considered. The set-up foresees 8 antennas inserted inside a tank filled with the coupling material; in front of the antenna array, a 3-D printed ellipsoidal phantom filled with tissue-mimicking liquid represents the thermally ablated zone. The proposed system is experimentally assessed with one antenna mechanically moved in a linear motion and measuring the signal in absence and in the presence of the 3-D printed phantom. The retrieved images inside the region of interest show that the designed system is able to detect the position of the ablated zone. The experimental results show the feasibility of the developed system for liver ablation monitoring that might be useful for new researchers to understand the challenges involved.
2023
Lecture Notes in Bioengineering
978-3-031-28665-0
978-3-031-28666-7
coupling medium; dielectric properties measurement; imaging algorithms; liver ablation; microwave imaging; Vivaldi antenna
02 Pubblicazione su volume::02a Capitolo o Articolo
An initial assessment of a microwave imaging system to monitor microwave ablation treatments / Wang, M.; Cavagnaro, M.; Scapaticci, R.; Costanzo, S.; Crocco, L.. - (2023), pp. 331-356. - LECTURE NOTES IN BIOENGINEERING. [10.1007/978-3-031-28666-7_11].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1696283
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