目的探讨16层螺旋CT对腹主动脉瘤的诊断价值。方法对40例腹主动脉瘤患者进行16层螺旋CT扫描,采用多平面重组(MPR)、最大密度投影(MIP)、容积再现(VR)图像重组。结果CT显示腹主动脉呈囊状扩张7例、梭形扩张23例、囊梭形扩张10例。其中多发性腹主动脉瘤3例,并发假性动脉瘤1例。MPR准确显示瘤体的位置、形态、范围及瘤腔内附壁血栓,MIP较好地显示瘤壁或附壁血栓内的钙化,VR以三维形式精确显示瘤体与邻近腹主动脉及其与分支血管的关系。结论16层螺旋CT是腹主动脉瘤诊断、随诊观察和术后随访最理想的影像技术。 Objective To investigate the diagnostic value of 16-slice spiral CT in abdominal aortic aneurysm. Methods Totally 40 patients with abdominal aortic aneurysm were scanned by 16-slice spiral CT and the images were reconstructed by multiplanar reconstruction (MPR), maximum density projection (MIP) and volume rendering (VR). Results CT showed cystic dilatation of the abdominal aorta in 7 cases, spindle expansion in 23 cases, cystic spindle expansion in 10 cases. One of multiple abdominal aortic aneurysms in 3 cases, complicated with pseudoaneurysm in 1 case. MPR accurately shows the location, shape and extent of the tumor, as well as the mural thrombus in the tumor cavity. MIP can better display the calcification in the tumor wall or the mural thrombus. VR accurately displays the tumor with the adjacent abdominal aorta in three- Branch of the relationship between blood vessels. Conclusion 16-slice spiral CT is the best imaging technique for diagnosis of abdominal aortic aneurysm, follow-up observation and postoperative follow-up.