肾脏占位病变双能量CT虚拟平扫与真实平扫图像特征对比  

Image features of kidney neoplasms of dual-energy CT:Comparison of virtual non-contrast image and true non-contrast image

作　　者：雷平贵 李建辉[1] 王鹤[1] 郭小超[1] 刘建新[1] 李美娇[1] 王霄英[1] LEI Pinggui LI Jianhui WANG He GUO Xiaochao LIU Jianxin LI Meijiao WANG Xiaoying(Department of Radiology, Peking University First Hospital, Beijing 100034, China Department of Radiology, the Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China)

机构地区：[1]北京大学第一医院医学影像科,北京100034 [2]贵州医科大学附属医院医学影像科,贵州贵阳550004

出　　处：《中国医学影像技术》2016年第12期1808-1812,共5页Chinese Journal of Medical Imaging Technology

摘　　要：目的探讨肾脏占位病变双能量CT(DECT)虚拟平扫(VNC)的图像特征及其与真实平扫(TNC)的差异。方法收集因肾脏占位病变接受泌尿系DECT平扫及增强扫描的患者33例,分别获得TNC及肾实质期虚拟平扫(VNC_n)图像。观察两种图像的特点并对图像质量进行客观及主观评价。结果图像客观评价显示,VNC_n与TNC图像中肾脏病灶、肾实质、腹主动脉、腹膜后脂肪CT值差异均有统计学意义(P均<0.001),图像的背景噪声(腹膜后脂肪标准差)、CNR、SNR差异亦有统计学意义(P均<0.05)。VNC_n与TNC图像中病灶内钙化的最大径、CT值及脂肪的CT值差异均有统计学意义(P均<0.05),而对脂肪最大径的显示差异无计学意义(P>0.05)。主观评价显示,VNC_n与TNC图像质量评分差异无统计学意义(P>0.05)。结论肾脏占位病变DECT的VNC_n与TNC图像质量相近,但对病灶内钙化、脂肪等细节的显示不及TNC图像。Objective To investigate the features of dual-energy CT （DECT） virtual non-contrast （VNC） image in pa- tients with renal masses, and to explore the difference between VNC and true non-contrast （TNC） images. Methods Thir- ty-three patients with renal masses were enrolled in this study. All the patients underwent DECT enhanced and plain scans. The images of virtual non-contrast of nephrographic phase （VNCn） and TNC were separately obtained and analyzed. The image quality was evaluated subjectively and objectively. Results For objective assessment, the statistical differences of CT values in renal lesion, renal parenchymal, aorta, retroperitoneal fat were found between VNCn and TNC images （all P〈0. 001）. While the differences of standard deviation （SD） of retroperitoneal fat, imaging CNR and SNR were also statis- tical （all P〈0.05）. There was statistical difference of CT value of fat in renal mass, CT value and size of calcification （all P〈0.05）. However, there was no statistical difference of the size of fat in renal mass （P〈0.05）. For subjective assessment, there was no statistical difference of image quality between VNCn and TNC （P〈0.05）. Conclusion The whole image quality of VNCn was familiar with that of TNC for detection of renal mass. But the TNC image was superior to VNCn for displaying calcification and fat of renal lesion.

关 键 词：肾肿瘤 体层摄影术 X线计算机 双能量 图像处理 计算机辅助 真实平扫 虚拟平扫 

分 类 号：R737.11[医药卫生—肿瘤] R814.42[医药卫生—临床医学]