Role of preoperative CT colonography in patients with colorectal cancer

Table 1 Computed tomography colonography scanning technique for a 64-slice scanner¹

	Preoperative CTC	Screening CTC
IV contrast media	Yes	No
Patient position	Prone (unenhanced), supine (portal phase)	Supine, prone
Collimation	32 mm × 0.6 mm	32 mm × 0.6 mm
Tube voltage	120 kV	120 kV
Tube current	140 eff mAs (unenhanced), 200 eff mAs (enhanced)	50 eff mAs
Tube rotation time	0.5 s	0.5 s
Pitch	1.4	1.4
Section width	1 mm	1 mm
Reconstruction increment	1 mm	1 mm

¹Scan parameters for Sensation 64 (Siemens, Erlangen, Germany). CTC: Computed tomography colonography.