Specific Anatomic Region	Liver
Application	Suspected metastases from colon cancer
Author	Ch'en IY et al.
Reference Source	J Comput Assist Tomogr 21(3):391-397
Scanner Used	Somatom Plus-4 or GE HiSpeed Advantage
Injection Rate	5ml/sec
Contrast Volume and Type	200ml of Omnipaque-300
Area Scanned	Entire liver
Scan Delay	25-30sec (arterial)60-70sec (portal venous)
Length of Spiral (time)	Up to 30sec
Slice Thickness	5mm
Table Speed/Pitch	5-8mm/sec or a pitch of 1-1.6
Reconstruction Interval	2.5mm
3D Technique Used	None
Comment: Although a dual-phase study might in theory be better, our experience and that of Ch'en et al. shows little difference in actual results. Dual-phase spiral CT does not appear to be indicated in the evaluation of liver metastases from colon cancer. Portal-venous-phase imaging alone is necessary.