Objective:To evaluate the diagnostic value and comparison of volume computed tomography digital subtraction angiography(VCTDSA) with 64-channel multidector row CT and three dimensional time-of-flight magnetic resonance angiography(3D TOF MRA) in intracranial aneurysms.Methods:In the blind retrospective study

the imaging data of 34 patients with suspected aneurysms were analyzed and diagnosed by DSA and/or surgery.The angiograms were interpreted by the presence

location

size of aneurysms and relationship of the aneurysms with the adjacent arterial branches(the image quality)

as well as the sensitivity and specificity

by using 3D volume rendering techniques.Results:In 41 aneurysms of 34 patients

the overall sensitivity and specificity of VCTDSA on a per-aneurysm basis were 87.0% and 85.7% respectively

and those of 3D TOF MRA were 80.0% and 66.6% respectively.Compared with 3D TOF MRA

there was no significant difference in the size of detected aneurysms by both two angiographies

but with a higher rank of image quality in VCTDSA.Conclusion:VCTDSA is a fast and reliable technique

which can be the primary choice in the detection and characterization of intracranial aneurysms.And 3D TOF MRA can be complementary for patients with contraindications of VCTDSA.