Objective:To investigate the value of three dimensional dynamic contrast enhanced magnetic resonance angiography (3D DCE MRA) for diagnosing aortic diseases . Methods: Ten patients with aortic diseases

in whom five with aortic aneurysms

three with aortic dissections and two with pseudoaneurysms

received 3D DCE MRA after imaging with conventional MRI( n =10)and cine MRI ( n =5).3D DCE MRA were performed with 3D FSPGR sequences. Results: ①3D DCE MRA detected one more aneurysm and 2 more aortic branches involved than the conventional MRI and/or cine MRI;②3D DCE MRA showed all the double lumens and intimal flaps of aortic dissections

and showed the involvement of aortic branches better than the conventional MRI;③3D DCE MRA demonstrated all of the 4 pseudoaneurysms

and the cavities and the slits of pseudoaneurysms were clearly identified. Conclusion: It is satisfactory to use 3D DCE MRA in showing the location

the extent and the involvement of aortic branches.Combination of conventional MRI with 3D DCE MRA will greatly improve the capabilities of MR in displaying and diagnosing aortic diseases

which can be used as a replacement of the traumatic DSA (aortography).