Advantages of 64-row computed tomography subtraction angiography in the diagnosis of intracranial aneurysms

Objective: To evaluate the advantages of 64-row computed tomography subtraction CT angiography in the diagnosis of intracranial aneurysms.Methods: One hundred and twenty patients who suffered from subarachnoid hemorrhage received CT examination;the CTA and subtraction CT angiography techniques were used to evaluate the cerebral arteries,respectively.Two senior neurosurgical and radiological doctors reviewed both types of the reconstructive results independently.Results: By the subtraction CT angiography technique,122 intracranial aneurysm were detected in 120 cases.Its sensitivity,specificity and negative likelihood ratio for detecting aneurysms on CTA were both 100% and 0.0000 respectively;however the CTA technique indicated 119 lesions and 3 were missed in processus clinoideus anterior of internal carotid,its sensitivity,specificity and negative likelihood ratio were 97.5%,100% and 0.025 0 respectively.Conclusion: Subtraction CT angiography technique have marked advantage in detecting the aneurysm of processus clinoideus anterior of internal carotid.