肠系膜动脉CT血管成像（CTA）不仅显示动脉病变管腔内的结构特征，还显示管腔外的解剖结构及闭塞段远端的管腔结构，成为肠系膜动脉疾病重要的诊断手段。正确解读肠系膜动脉CTA图像需要：（1）熟知肠系膜动脉解剖结构及重要的交通支：腹腔动脉、肠系膜上动脉（SMA）间通过胰十二指肠动脉弓交通；邻近空回肠动脉彼此吻合，形成不同级别的血管弓；肠系膜下动脉（IMA）、SMA通过结肠边缘动脉弓及Riolan动脉弓交通。（2）了解不同重建图像的优缺点：容积再现（VR）显示SMA空间解剖形态逼真，分支毗邻关系清晰，但显示动脉分支的能力不佳；最大密度投影（MIP）显示SMA空间走行较差，重叠较严重；薄层MIP（TS-MIP）显示肠系膜血管网、肠壁微小血管佳，整体感、空间立体感差；曲面重建（CPR）可显示SMA主干病变的位置、范围、严重程度，但无法显示与分支的关系。综合运用多种重建技术及窗宽技术，将肠系膜动脉疾病的形态学特征显示全面、详细，并结合其发病特点，不仅可正确诊断，还能为临床制定治疗方案提供依据。

3D-CTA for diagnosis of mesenteric arterial disease                  XIAO Liang, MU Xiao-lin. Department of Radiology, First Affiliated Hospital of China Medical University, Shenyang 110001,China
Corresponding author：XIAO Liang, E-mail：xiaoliang1972@126.com
Abstract    Mesenteric artery CTA, displaying not only the luminal structures of the lesions but also the anatomy of the outer lumen and the luminal structures of the segment beyond occlusive lesion, has become an important diagnostic tool of mesenteric artery disease. Correct interpretation of the mesenteric artery CTA images should know something as following: (1) Familiar with mesenteric artery anatomy and important communicating branches, such as the communicating branch between celiac artery and SMA, jejuno-ileal artery anastomosis, the communicating branch between IMA and SMA, and Riolan’s arch; (2) Understand the advantages and disadvantages of different image reconstruction: VR can display vivid anatomy and the relationships of neighbor branches, but it’s capability of displaying the arterial details is unsatisfactory; MIP displays poorer SMA spatial structure as more overlapping artifacts; TS-MIP can distinctly show the tiny blood vessels of mesenteric vascular network, but SMA spatial structure could not be displayed satisfactorily; CPR can clearly show the structural characteristics of the SMA trunk lesion, but can not show the relationship between the trunk and the branches. Integrative utilization of various reconstruction techniques and combining with window technology should overall display morphological features of mesenteric arterial disease in detail. In addition, combining clinical features of the diseases, we can make the correct diagnosis and provide a basis of the clinical therapeutic regimen.