本文選題：微波消融 + 溫度場(chǎng)　； 參考：《北京工業(yè)大學(xué)學(xué)報(bào)》2014年12期

【摘要】：為了研究血管對(duì)消融溫度場(chǎng)的影響,運(yùn)用離體實(shí)驗(yàn)的方法測(cè)定距天線不同距離及血流量不同的血管對(duì)溫度場(chǎng)的影響.實(shí)驗(yàn)中采用輸液管代替肝動(dòng)脈,并依據(jù)肝動(dòng)脈的血流速度設(shè)定管內(nèi)的水流速度;利用銅-康銅熱電偶測(cè)量血管周?chē)臏囟葓?chǎng).并在相同的條件下進(jìn)行微波消融的仿真計(jì)算,對(duì)比實(shí)驗(yàn)與仿真結(jié)果的不同.結(jié)果顯示:當(dāng)微波天線距血管1.0 cm時(shí),由于血液對(duì)流換熱的影響,微波消融域并沒(méi)有關(guān)于微波天線對(duì)稱,在靠近血管的一側(cè)出現(xiàn)了很大的溫度梯度,且隨著血流量的增大,微波消融域變小;當(dāng)微波天線距離血管1.5 cm時(shí),微波消融域的形狀開(kāi)始變圓,并且天線兩側(cè)相同距離的點(diǎn)的溫升曲線的溫差也開(kāi)始減小;當(dāng)微波天線距離血管2.0 cm時(shí),微波消融域幾乎呈圓形,且關(guān)于微波天線對(duì)稱,血管的影響可以忽略.當(dāng)血流量增大時(shí)(從22 cm/s變?yōu)?5 cm/s),血管對(duì)溫度場(chǎng)的影響增大(與22 cm/s的溫差最大可達(dá)10℃),消融溫度場(chǎng)進(jìn)一步減小.當(dāng)微波天線與血管之間的距離大于2.0 cm時(shí),對(duì)于小流量的血管可以忽略其對(duì)于溫度場(chǎng)的影響,熱療前不用進(jìn)行血管阻斷術(shù).當(dāng)微波天線與血管之間的距離小于2.0 cm且血流量大于22 cm/s時(shí),為了不影響消融的療效,建議進(jìn)行血管阻斷術(shù).
[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，

本文編號(hào)：1923260