The Value of 16 Slice Spiral CT 3D Reconstruction in the Assessment of Small Intracranial Aneurysms

Objective To discuss the value of 16 slice spiral CT 3D reconstruction in the assessment of small intracranial aneurysms (≤5mm).Materials and Methods 337 patients underwent 16 slice CT angiography (CTA) for suspected intracranial aneurysms,and the 3D CT images were compared to DSA and intraoperative findings retrospectively.The aneurysms which were less or equal to 5 mm in largest diameter were considered as small aneurysms.3D reconstruction techniques included maximum intensity projection and volume rendering techniques.Results Combining CTA,DSA and intraoperative findings,95 small intracranial aneurysms were identified in 84 of the 337 patients.4 small aneurysms were missed with CTA,and 6 small aneurysms were not clearly depicted by DSA.There was no statistically significant difference between 16 slice CTA and DSA in accuracy of showing small intracranial aneurysms.3D CTA images were more clear and accurate in showing small aneurysm bodies and necks,and also demonstrating the relationship of aneurysms to neighboring vessels,which provided much valuable information to guide the therapy of small aneurysms.Conclusion 16 slice CTA is a highly accurate imaging modality for the diagnosis of small intracranial aneurysms,and it can provide sufficient diagnostic information in the treatment of small aneurysms.