双低剂量CT引导的肺静脉3D建模打印的可行性研究

Feasibility Study of Double Low Dose CT Guided 3D-Modeling Print in Pulmomary Vein

目的探讨低辐射剂量及低浓度对比剂CT扫描技术行肺静脉3D建模打印的临床可行性。方法将10例拟行肺静脉3D建模打印的患者,行肺静脉CT血管造影(CTA)检查,随机分为两组,每组5例。A组(低剂量组):采用"管电压100 kVp,自动毫安,对比剂碘克沙醇(Visopaque 270mg I/ml),60%自适应统计迭代重组(ASIR)"扫描方案;B组(常规剂量组):采用"管电压120 kVp,200mA,对比剂碘海醇(Iohexol 350mgI/ml),滤波反投影法(FBP)重组算法"扫描方案。记录两组扫描结束后的有效辐射剂量(ED)。将两组CT原始数据传至3D打印机行肺静脉3D建模打印,对3D建模打印质量进行主观评价。结果两组间患者所受ED比较,低剂量组较常规剂量组显著降低29%,差异均有高度统计学意义(P<0.05)。两组肺静脉3D建模打印图像质量主观评价比较差异均无统计学意义(P > 0.05)。结论应用双低CT扫描技术行肺静脉3D建模打印可满足临床诊断需要,同时大幅度降低患者所受辐射剂量。

Objective To explore the feasibility of low tube voltage combined low-dose contrast CT scan technique in pulmomary vein 3D modeling print.Methods 10 patients who underwent pulmomary vein 3D modeling print were divided into two groups randomly,and each group includes 5 cases.Group 1(double low group) used contrast medium of Visopaque 270 mgI/ml and 100 kVp were reconstructed with 60% ASIR.Group 2(normal group) used Iohexol 350 mgI/ml and120 kVp were reconstructed with filtered back projection(FBP).Effective radiation dose(ED) of each patient were calculated and compared.To make the two groups original data pass the 3D print machine performed pulmomary vein 3D modeling print,and finished 3D modeling print subjective assessment.Results The ED in double low group were obviously lower than that in normal group(P < 0.05),with about 29% of reduction.There was no statistically significant difference between the two groups(P > 0.05) in 3D modeling print quality analyzed subjectively.Conclusion Adopting double low CT scan can obtain the pulmomary vein 3D modeling print quality to meet diagnostic needs with a large scale reduction of the radiation dose.