双源双能量CT胰腺虚拟平扫的临床应用价值研究  

The application values of using dual-energy scan in virtual non-contrasted images of pancreas with dual-source CT

作　　者：叶荣[1] 雷军强[1] 郭奇虹[1] 乔吴高 

机构地区：[1]兰州大学第一医院放射科,甘肃兰州730000

出　　处：《中国中西医结合影像学杂志》2017年第5期526-529,533,共5页Chinese Imaging Journal of Integrated Traditional and Western Medicine

摘　　要：目的 :探讨双源双能量CT胰腺虚拟平扫的临床应用价值。方法 :50例患者行上腹部双源CT常规平扫及动脉期、门脉期、延迟期双能量CT增强扫描,通过双能量"Liver VNC"软件后处理分别得到动脉期、门脉期及延迟期的虚拟平扫图像,比较常规平扫与3组虚拟平扫图像的胰腺平均CT值、竖脊肌平均CT值、SNR、对比噪声比(CNR)、图像主观质量、病灶显示情况及辐射剂量。结果:常规平扫与虚拟平扫图像的胰腺平均CT值、竖脊肌平均CT值差异均无统计学意义(均P>0.05);虚拟平扫图像的SNR、CNR均高于常规平扫图像(均P<0.05);常规平扫与虚拟平扫所有图像评分均在3分以上,差异有统计学意义(P<0.05),均满足临床诊断需要;常规平扫与虚拟平扫图像对病灶有相似的检出功能;双能量扫描虚拟平扫的总有效剂量低于常规扫描(P<0.05)。结论:双源双能量CT胰腺虚拟平扫图像质量较常规平扫图像有一定程度下降,但可满足临床诊断需求,同时又减少一次平扫的辐射剂量,且SNR更高,因此具有潜在的临床应用价值。Objective：To explore the application values of using dual-energy scan in virtual images of pancreas with du-al-source CT. Methods：Fifty consecutive patients prospectively underwent abdominal DECT to assess the pancreas using a triphasic protocol consisting of true non-contrasted （TNC）,arterial-phase （AP）,portal-phase （PP） and delay-phase （DP） acquisi-tions. Dual-energy scan mode was used in the AP,PP and DP. VNC image of AP,PP and DP were generated by dual-energy Liver VNC respectively. The average CT value of pancreas and erector spinae,image noise,signal-to-noise ratio （SNR） of pancreas, contrast-to-noise ratio （CNR） of pancreas-to-erector spinae,the display of lesion,score of subjective diagnosis and radiation dose were compared among TNC,AP-VNC,PP-VNC,and DP-VNC. Results：The average CT value of pancreas and erector spinae was not significantly different among TNC,AP-VNC,PP-VNC,and DP-VNC （P〉0.05）. Image noise,SNR of pancreas,CNR of pancreas-to-erector spinae were significantly different among four groups （P〈0.05）. AP-VNC showed the highest SNR of pancreas. There was statistical difference in image quality between four groups of images （P〈0.05）,and all images received a score of more than 3. There had a similar detection performance in lesion between four groups of images. The scores of subjective diagnosis of four groups demonstrated that they four were appropriated to diagnosis. Conclusions：The image quality of VNC images is lower than TNC images,but it could meet the demand of clinical diagnosis. And VNC image has potential clinical application value,so as to reduce the radiation dose of patient.

关 键 词：体层摄影术 X线计算机 双能量扫描 胰腺 虚拟平扫 信号噪声比 对比噪声比 辐射剂量 

分 类 号：R576[医药卫生—消化系统] R816.5[医药卫生—内科学]