GI Tract

Colon: Virtual colonoscopy

Specific Anatomic Region

Colon

Application

Virtual colonoscopy

Author

Hara AK

Reference Source

AJR 1997; 168:1181-1184

Scanner Used

GE HiSpeed Advantage

Injection Rate

N/A

Contrast Volume and Type

Rectal air

Area Scanned

Entire abdomen

Scan Delay

None

Length of Spiral (time)

3 to 4 20sec breathhold spirals

Slice Thickness

5mm

Table Speed/Pitch

6.5mm/sec or a pitch of 1.3

Reconstruction Interval

3mm

3D Technique Used

Shaded surface

Comment: The authors felt that this protocol was as good as one using 1mm reconstruction intervals. We have been using a protocol of 3mm collimation, 6mm/sec table speed and reconstruction at 1mm intervals. The main problem is >400 slices which is time consuming.