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The Evolution of Microwave-Induced Thermoacoustic Signals Generated During Pulsed Microwave Ablation in Bovine Liver | IEEE Journals & Magazine | IEEE Xplore

The Evolution of Microwave-Induced Thermoacoustic Signals Generated During Pulsed Microwave Ablation in Bovine Liver


Thermoacoustic signals generated using an interstitial microwave ablation antenna during microwave heating of bovine liver tissue.
Impact Statement:Take-Home Messages •We utilize the thermoelastic effect to convert pulsed microwave energy into thermoacoustic signals that can be used to monitor the evolution of the mi...Show More

Abstract:

The temperature dependence of microwave-induced thermoacoustic signals generated in tissue may be exploited to monitor microwave ablation in real-time. We present an expe...Show More
Impact Statement:
Take-Home Messages •We utilize the thermoelastic effect to convert pulsed microwave energy into thermoacoustic signals that can be used to monitor the evolution of the microwave ablation zone in real time. •Thermoacoustic signal characteristics are highly dependent on the temperature and coagulation state of tissue and thus contain valuable information about the microwave ablation zone in which they were generated. •Microwave ablation is used clinically to treat malignant tumors via localized heating; we explore the physical basis for a novel method for monitoring this procedure in real-time. •We find that the time difference of arrival of thermoacoustic signals is a reliable characteristic to track over the course of microwave ablation, and tissue shrinkage is an important consideration as it influences the time difference of arrival. •This study is the first to investigate thermoacoustic signals generated using an interstitial microwave ablation antenna in the presence of significant...

Abstract:

The temperature dependence of microwave-induced thermoacoustic signals generated in tissue may be exploited to monitor microwave ablation in real-time. We present an experimental study investigating the evolution of microwave-induced thermoacoustic signals that are generated within an ablation zone during microwave ablation in bovine liver tissue. An X-band interstitial coaxial ablation antenna is used to simultaneously heat liver tissue to temperatures up to 90 ^{\circ }C and excite thermoacoustic signals via the absorption of pulsed microwave energy. Thermoacoustic signals are detected using a single-element ultrasound transducer located at the surface of the tissue. Both fresh and boiled liver tissue samples are used in experiments to decouple the influence of temperature and tissue coagulation on thermoacoustic signal characteristics. We identify two thermoacoustic signal characteristics of interest: arrival time of the pulse at the ultrasound receiver and the energy in the pulse...
Thermoacoustic signals generated using an interstitial microwave ablation antenna during microwave heating of bovine liver tissue.
Page(s): 273 - 280
Date of Publication: 02 May 2023

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