血管对肝脏微波消融温度场的影响

发布时间：2018-05-22 19:05

  本文选题：微波消融 + 温度场　； 参考：《北京工业大学学报》2014年12期

【摘要】：为了研究血管对消融温度场的影响,运用离体实验的方法测定距天线不同距离及血流量不同的血管对温度场的影响.实验中采用输液管代替肝动脉,并依据肝动脉的血流速度设定管内的水流速度;利用铜-康铜热电偶测量血管周围的温度场.并在相同的条件下进行微波消融的仿真计算,对比实验与仿真结果的不同.结果显示:当微波天线距血管1.0 cm时,由于血液对流换热的影响,微波消融域并没有关于微波天线对称,在靠近血管的一侧出现了很大的温度梯度,且随着血流量的增大,微波消融域变小;当微波天线距离血管1.5 cm时,微波消融域的形状开始变圆,并且天线两侧相同距离的点的温升曲线的温差也开始减小;当微波天线距离血管2.0 cm时,微波消融域几乎呈圆形,且关于微波天线对称,血管的影响可以忽略.当血流量增大时(从22 cm/s变为55 cm/s),血管对温度场的影响增大(与22 cm/s的温差最大可达10℃),消融温度场进一步减小.当微波天线与血管之间的距离大于2.0 cm时,对于小流量的血管可以忽略其对于温度场的影响,热疗前不用进行血管阻断术.当微波天线与血管之间的距离小于2.0 cm且血流量大于22 cm/s时,为了不影响消融的疗效,建议进行血管阻断术.
[Abstract]:In order to study the effect of blood vessels on the ablation temperature field, the effects of different distances from the antenna and blood flow on the temperature field were measured by in vitro experiments. In the experiment, the infusion tube was used to replace the hepatic artery, and the flow velocity in the tube was set according to the blood flow velocity of the hepatic artery, and the temperature field around the vessel was measured by copper-Kang copper thermocouple. The simulation results of microwave ablation under the same conditions are compared with the simulation results. The results show that when the microwave antenna is 1.0 cm away from the blood vessel, due to the effect of convective heat transfer, there is no symmetry about the microwave antenna in the microwave ablation domain, and a large temperature gradient appears on the side near the vessel, and with the increase of blood flow, When the microwave antenna is 1.5 cm away from the blood vessel, the shape of the microwave ablation field begins to become round, and the temperature difference of the temperature rise curve of the same distance on both sides of the antenna begins to decrease, while the microwave antenna is 2.0 cm away from the vessel. The area of microwave ablation is almost circular, and the influence of vessels on the symmetry of microwave antenna can be neglected. When the blood flow increased (from 22 cm/s to 55 cm / s), the effect of blood vessel on the temperature field increased (the maximum temperature difference with 22 cm/s was 10 鈩，

本文编号：1923260