噪声优化的虚拟单能量成像技术在双能量CTPA图像中的应用研究  

Application Study of Noise-Optimized Virtual Monochromatic Imaging Technology in Dual-Energy CTPA Images

作　　者：易思琪 胡仕北[1] 何雅坤[1] 何长久[1] YI Siqi;HU Shibei;HE Yakun;HE Changjiu(Department of Radiology,Sichuan Cancer Hospital,Chengdu Sichuan 610041,China)

机构地区：[1]四川省肿瘤医院放射科,四川成都610041

出　　处：《中国医疗设备》2022年第8期108-113,共6页China Medical Devices

基　　金：四川省科技计划项目(2021YFS0225)。

摘　　要：目的探讨噪声优化的虚拟单能量成像技术(Noise-optimized Virtual Monoenergetic Image,VMI+)优化CT肺动脉成像(CT Pulmonary Angiography,CTPA)图像质量、提高栓子检出效能和降低辐射剂量的可行性。方法选取2020年7至2021年3月在我院行CTPA检查的61例患者作为研究对象,随机分为两组,A组为双能量扫描(80/Sn140 kV,30例),B组为单能量扫描(120 kV,31例)。A组使用线性融合技术(Linear Blending,LB)获得M=0.6的LB图像(A1组),使用VMI+技术获得VMI40+图像(A2组)和VMI60+图像(A3组)。比较4组图像的信噪比(Signal to Noise Ratio,SNR)、对比噪声比(Contrast to Noise Ratio,CNR)和主观图像质量;比较A1组、A2组和A3组图像的栓子检出量和显示清晰度;比较A组和B组的辐射剂量。结果A2组和A3组的CNR值均显著高于A1组和B组(P<0.05)。A3组SNR显著优于A2组(P<0.05),A3组、A1组和B组3组SNR无统计学意义差异(P>0.05);4组图像质量主观评分差异有统计学意义(P<0.05),且A3组评分最高;A2组和A3组段以下栓子显示清晰度和检出量无统计学意义差异(P>0.05),但均高于A1组(P<0.05)。A组有效辐射剂量显著低于B组(P<0.05)。结论VMI+技术能提高CTPA图像质量、栓子检出效能和降低辐射剂量,可为临床诊断肺栓塞提供更可靠的影像资料。Objective To investigate the feasibility of improving image quality in CT pulmonary angiography(CTPA),enhancing the efficiency of embolus detection and reducing radiation dose with noise-optimized virtual monoenergetic imaging(VMI+)technology.Methods A total of 61 patients who took CTPA examinations in our hospital were selected as the research subjects and randomly divided into two groups.30 patients underwent dual-energy imaging(80/Sn140 kV,group A)and 31 patients underwent single-energy imaging(120 kV,group B).Group A used linear blending technique(LB)to obtain LB images with M=0.6(group A1),and VMI40+images(group A2)and VMI60+images(group A3)were obtained by using VMI+technique.The signal-to-noise ratio(SNR),contrast signal-to-noise ratio(CNR),and subjective image quality among four groups were compared.The quantity of embolus and display resolution in group A1,A2 and A3 were compared.The radiation dose of group A was compared with group B.Results The CNR values of group A2 and A3 were significantly higher than those of group A1 and group B(P<0.05).The SNR of group A3 was higher than that of group A2(P<0.05).There were no statistically significant differences among group A1,group A3 and group B(P>0.05).There was significant difference in subjective score of image quality among the four groups(P<0.05),and the score of A3 group was the highest.There was no statistically significant difference in the display resolution and quantity of embolus shown in sub segmental pulmonary arteries between group A2 and group A3(P>0.05),however they were higher than group A1(P<0.05).The effective radiation dose of group A was lower than that of group B(P<0.05).Conclusion VMI+technology can improve the quality of CTPA images and the efficiency of embolus detection,as well as reduce radiation exposure which can provide more reliable image data for clinical diagnosis of pulmonary embolism.

关 键 词：CT肺动脉成像 噪声优化的虚拟单能量成像技术 线性融合技术 图像质量 辐射剂量 

分 类 号：R816[医药卫生—放射医学]