Abstract: Objective: To estimate the value of spiral CT in diagnosis and treatment of aortic dissection.Methods: The imaging data of fifteen cases of aortic dissection were analyzed retrospectively.Results: On unenhanced CT scan,the imaging findings showed dilation of the aorta,linear hypoattenuating intima or intimal calcifications in the lumen and egg-like calcification on the aortic wall.On enhanced CT scan,double lumens,intimal flap,shape and location of the rupture,extension of the involved aorta and its branches were demonstrated.Conclusions: Spiral CT,especially multi-detected CT,is effective in diagnosis of aortic dissection and is of great value in guiding clinical treatment.