A Comparative Study on CTA and DSA in Diagnosis of Intracranial Aneurysms

Objective To evaluate the value of three dimensional CT angiography in the diagnosis of intracranial aneurysms by the comparison with DSA.Methods CTA and DSA were performed in 30 patients(aged 34~76 years) who were highly suspected with intracranial aneurysms.Feasible endovascular treatment were performed simultaneously.The sensitivity,specificity,accuracy in detecting the aneurysms,in demonstrating the neck of the aneurysms and the relationship of parent artery were compared between CTA and DSA.Results 26 intracranial aneurysms were detected by CTA,the sensitivity,sepcificity and accuracy were 95.5%,87.5% and 93.3% respectively.There were no statistical differences among the sensitivity,specificity,accuracy between CT and DSA(Ρ0.05).CTA were significantly better than that of DSA in showing the detail of aneurysms and its neck.Conclusion 3D CTA is a fast,noninvasive and efficient technique in diagnosing the intracranial aneurysms.It’s three dimensional information is helpful for treatment planning.CTA can be specially used to screen aneurysms in acute patients.