Circle of Willis: R/O aneurysm/evaluate aneurysm

Specific Anatomic Region	Circle of Willis
Application	R/O aneurysm/evaluate 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 / 165 / .5
Detector Collimation (mm)	.5 or 1
Slice Thickness (mm)	1 or 1.25
Data Reconstruction Interval (mm)	1
Table Speed (mm per rotation) / Pitch	1.3 / 2.6 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)	15-20 sec
3D Technique Used	Volume rendering
Comment: -A key to this study is the quality of the dataset for 3D imaging.