The 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 angiography in the diagnosis of intracranial aneurysms. Materials and Methods 61 patients who suffered from subarachnoid hemorrhage received CT examination; the CTA and subtraction angiography techniques including MIP and VR were used to evaluate the cerebral arteries, respectively. Two senior neurosurgical and radiological doctors reviewed the reconstructive results independently and compared the results with surgery or DSA. Results By the subtraction angiography technique, 63 intracranial aneurysms were detected in 55 cases, the sensitivity, specificity and negative likelihood ratio for detecting aneurysms on CTA were both 100%, 0.0000 respectively. Inter-observer agreements were 1 respectively. However, the CTA technique detected 60 lesions and 3 lesions were missed in anterior clinoid process of internal carotid artery, the sensitivity, specificity and negative likelihood ratio were 95%, 100% and 0.0500 respectively. Inter-observer agreements were 0.9656 respectively. Conclusion Subtraction angiography technique has marked advantage in detecting the aneurysm in anterior clinoid process of internal carotid artery.