A dose of 1-2 ml/kg body weight of concentration 370mg/ml non-ionized contrast media will be administered at a rate of 4ml/sec, with an upper limit of 150ml. Venous access is an antecubital vein with a 14 or at least 18G cannula. The scan delay time for the arterial phase images is obtained by using bolus tracking with a circular region of interest positioned in the abdominal aorta and a predefined 90-housenfield unit bolus-trigger threshold to the start of automatic scanning. The coverage from just above the diaphragm to the Ischial tuberosities including the rectum in all cases.