Circle of Willis: Detection and assessment of intracranial aneurysm

Specific Anatomic Region	Circle of Willis
Application	Detection and assessment of intracranial aneurysm
Author	Fishman EK
Reference Source	Personal Communication
Scanner Used	Siemens Plus4 Volume Zoom
KV / mAs / Time per Rotation (sec)	120 / 109 / .5 or 120 / 200 / .5
Detector Collimation (mm)	1
Slice Thickness (mm)	1.25
Data Reconstruction Interval (mm)	1
Table Speed (mm per rotation) / Pitch	5 / 5 or 6 / 6
Oral Contrast	N/A
IV Contrast Volume and Type	100-120 cc of Omnipaque 350
Injection Rate	3 cc / sec
Scan Delay (sec)	20 sec
3D Technique Used	Volume rendering
Comment: -The key is to acquire all of the data in the arterial phase.