Comparison of implanted cooled-shaft 915 MHz and 2450 MHz microwave ablation of in vivo porcine livers / 中国医学影像技术

ABSTRACT

Objective To compare the difference of implanted cooled-shaft with 915 MHz and 2450 MHz microwave in ablation area and the characteristics of temperature field in porcine livers in vivo. Methods Ablations were performed with 915 MHz and 2450 MHz, and were divided into two groups accordingly. The microwave antenna was inserted into porcine liver in vivo and the thermal needles were placed in parallel 5 mm, 10 mm, 15 mm, 20 mm, away from the antenna slit. The temperature data were collected with computer when the microwave ablation was started with the same energy of 60 W 600 s. After ablations, sizes of the ablation zones and the temperature curves were compared between the two groups. Results Compared with 2540 MHz microwave, 915 MHz microwave had larger coagulation length and width, faster temperature ascending rate and higher temperature in corresponding points. Conclusion In porcine livers in vivo, compared with 2450 MHz microwave, larger coagulation zone and faster temperature ascending rate can be obtained with 915 MHz microwave.