Extrahepatic biliary cancer: New staging classification

Table 2 Multidetector computed tomography multiphasic acquisition

Phase of image acquisition	Time of acquisition	Section thickness (mm)	Milliamperage (mA)
Unenhanced liver images		5	250
Arterial phase liver images	Bolus tracking technique or manually at 30-35 s after the onset of contrast material injection	1-2.5	500
Portal venous phase abdomen and pelvis	Acquired 60-65 s after the start of injection	2.5-5	500
Delayed phase	Acquired 3-5 min after the start of injection	5	250

2.5-mm thick coronal and sagittal reformats are reconstructed with images of the portal venous phase.