The single antenna of water- cooled microwave antenna for treating tumor cells with a diameter less than 3 cm has satisfactory therapeutic effect, but it is not ideal for large tumor cells. Based on a new type of microwave antenna with three antennas, this paper discusses its characteristics under different power and time, including the effective ablation area and temperature distribution. Bovine liver was ablated in vitro under different microwave power and time, the temperature rising curve was recorded at the measuring points, and the ablation size was measured. The results show that within 15 min, the maximum ablation area under 40 W was 25.627±2.400 cm2, the maximum ablation volume was 81.655±3.500 cm3, and the aspect ratio of the ablation area was within 0.660±0.020. Within 15 min, the maximum ablation area under 60 W was 49.803±2.900 cm2, the maximum ablation volume was 244.965 ± 4.000 cm3, and the aspect ratio of the ablation area was 0.777 ± 0.010. When the tumor diameter <5.3 cm, and the longitudinal diameter <6.9 cm, 40 Wis recommended for use. When the tumors are larger and with a quasi-circular shape, 60 W is recommended for use. Low-power and prolonged treatment helps clinicians to accurately control the ablation range, avoiding ablation of other organs and tissues.
LIU Youjun
,
YAN Kai
,
NIE Xiaohui
,
GUO Xuemei
,
NAN Qun
. Thermal Field of Water-cooled Microwave Ablation Antenna with Three Antennas[J]. Science & Technology Review, 2014
, 32(30)
: 50
-54
.
DOI: 10.3981/j.issn.1000-7857.2014.30.008
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