能谱CT单能量成像结合低浓度对比剂在门静脉成像的应用价值  

Application Value of Energy Spectrum CT Single Energy Imaging Combined with Low Concentration Contrast Agent in Portal Vein Imaging

作　　者：周泽旺[1] 张昌政[1] 郑瑛琪 李丹丹[1] ZHOU Ze-wang;ZHANG Chang-zheng;ZHENG Ying-qi;LI Dan-dan(Department of Radiology, the First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou Guangdong 510405, China)

机构地区：[1]广州中医药大学第一附属医院影像科,广东广州510405

出　　处：《中国医疗设备》2017年第5期87-90,共4页China Medical Devices

摘　　要：目的探讨能谱CT单能量成像结合低浓度对比剂在门静脉成像的应用价值。方法 70例欲行肝门脉CT增强患者随机分为A、B两组。A组用CT能谱成像(Gemstone Spectral Imaging,GSI),270 mg I/m L碘克沙醇;B组用常规CT增强扫描,350 mg I/m L碘佛醇。计算两组门静脉图像噪声、对比噪声比(Contrast-to-Noise Ratio,CNR)、信噪比(Signal-to-Noise Ratio,SNR)、图像主观评分及有效辐射剂量(ED),并进行相应统计学分析。结果 A组门静脉最佳CNR图像单能量水平在50 Ke V左右,最佳单能图结合50%自适应统计迭代重建(Adaptive Statistical Iterative Recon,ASi R)图像的SNR(7.46±1.00)、CNR(5.31±1.23)均高于B组SNR(5.03±1.00)、CNR(3.18±1.58);噪声(16.58±7.16)和平均ED(3.27±1.57)m Sv低于B组噪声(23.19±11.71)及平均ED(4.06±0.85)m Sv,差异具有统计学意义。A组图像主观评分略高于B组,差异不具有统计学意义。结论能谱CT最佳单能量成像结合低浓度对比剂,采用ASi R技术,得到的门静脉图像质量与常规CT增强相当,辐射剂量降低,值得在临床上推广。Objective This paper aim to explore the application value of energy spectrum CT single energy imaging combined with low concentration contrast agent in portal vein imaging.Method70patients were randomly divided into A,B two groups to receive liver CT enhanced scan.A group using the gem CT energy spectrum imaging(GSI),270mgI/mL iodixanol;B group using conventional CT enhanced scanning,350mgI/mL ioversol.Calculation the portal image noise,contrast to noise ratio(CNR),signal to noise ratio(SNR),image quality subjective evaluation and the effective radiation dose(ED)of the two groups,and the corresponding statistical analysis.Results The SNR(7.46±1.00)and CNR(5.31±1.23)of images in the A group were higher than those of the B group[(5.03±1.000)and(3.18±1.58)].The noise(16.58±7.16)of image and average ED(3.27±1.57)mSv were lower than those of the B group[(23.19±11.71)and(4.06±0.85)],the difference was statistically significant.The subjective scores of images in the A group were slightly higher than those in the B group,but there was no statistical difference between the two groups.Conclusion The best single energy spectrum CT imaging combined with low concentration contrast,using adaptive statistical iterative reconstruction(ASiR)technology,it can get the same image quality as the conventional enhanced CT,reduce radiation dose,is worth to be popularized in clinic.

关 键 词：能谱单能量 门静脉 低浓度对比剂 X线计算机 辐射剂量 

分 类 号：R816.5[医药卫生—放射医学]