双源CT双能量碘图成像对孤立性肺结节诊断价值分析

目的分析双源CT双能量碘图成像对孤立性肺结节患者的诊断价值。方法选取新乡市中心医院2020-01-04-2021-05-03收治的51例孤立性肺结节患者作为研究对象。所有患者均接受双源CT双能量碘图成像和常规CT,以病理检查结果为金标准,分析双源CT双能量碘图成像和常规CT对孤立性肺结节患者的诊断价值和诊断效能、2种检查方式的辐射剂量和抗干扰能力以及双源CT双能量碘图成像孤立性肺结节图像特征。结果51例患者中,手术病理活体组织检查检测出恶性肿瘤39例,检出率为76.47%;良性结节12例,检出率为23.53%。常规CT和金标准一致性一般,Kappa值为0.411;双源CT双能量碘图成像和金标准一致性较好,Kappa值为0.682。双源CT双能量碘图成像诊断符合率为86.27%、敏感度为87.17%、特异度为83.33%、阴性预测值为66.67%、阳性预测值为94.44%,均高于常规CT的74.51%、74.36%、75.00%、47.37%、90.63%,均P<0.05。双源CT双能量碘图成像单次辐射剂量为(4.81±1.05)mSv,少于常规CT的(5.71±1.04)mSv,t=4.349,P<0.001;双源CT双能量碘图成像和常规CT图像信噪比分别为2.85±0.91、3.01±0.94,差异无统计学意义,t=0.873,P=0.385;双源CT双能量碘图成像和常规CT图像噪声分别为(9.85±2.37)、(9.60±3.01)dB,差异无统计学意义,t=0.466,P=0.642。结论双源CT双能量碘图成像对孤立性肺结节诊断价值更高、辐射量低且不影响抗干扰能力。

DIRECT NUMERICAL SIMULATIONS OF TURBULENT CHANNEL FLOWS WITH CONSIDERATION OF THE BUOYANCY EFFECT OF THE BUBBLE PHASE

Turbulent channel flows with consideration of the buoyancy effect of the bubble phase is investigated by means of the Direct Numerical Simulation （DNS）. This two-phase system is solved by a two-way coupling Lagrangian-Eulerian approach. The Reynolds number based on the friction velocity and the half-width of the channel is 194, and the gravitational acceleration varies from -0.5 to 0.5, ranging from the upflow to the downflow cases. This study aims to reveal the influence of buoyancy on the turbulence behavior and the bubble motion. Some typical statistical quantities, including the averaged velocities and velocity fluctuations for the fluid and bubble phases, as well as the flow structures of the turbulence fluctuations, are analyzed.

拇指缺损全形再造的临床研究

目的:探讨全形再造在拇指缺损中的应用效果.方法:选取30例拇指缺损患者,进行口甲皮瓣联合第2足趾骨关节的全形再造.结果:30例再造拇指全部成活,术后随访6-24个月.再造拇指外观接近正常,两点辨别觉6-9mm,拇指对掌对指功能良好.按照中华医学会手外科学会标准评定:优27例,良3例,优良率100%.结论:全形再造拇指的外形美观,功能良好,且保留了第2足趾,患者的满意度高,值得临床推广应用.