G. V. Prasad1, Kondal Rao2, Rajendra3

The goal of the study is to determine the value of various phases of Triple, Helical CT, Hepatic arterial Phase (HAP), Portal venous phase (PVP) and Equilibrium Phase (EP), is the detection and characterization of Hepatic Lesions and to evaluate whether unenhanced and hepatic arterial phases when used in conjunction with porto venous phase would lead to detection of greater number of lesions or better characterization of lesion. METHODOLOGY: The study population consists of 50 Patients aged between 30 Years and 80 Years were examined with multiphase (plain, hepatic arterial, portal venous and equilibrium phases). Spiral CT of liver. Patients were referred for CT scan when liver diseases were suspected clinically, if ultrasound and other previous investigations revealed lesions which had to be further evaluated by spiral CT and to detect liver metastases in known cases of primary extra hepatic malignancy. CT TECHNIQUE: Helical scanning of liver with Toshiba astein s4, continuous spiral run and the images were reconstructed at 5mm intervals. Contrast material 100ml was injected through 18 or 20G catheter at the rate of 3ml per second using automatic medrad power injector. Non-ionic contrast [IOHEXOl – 300mg perml was used in all the patients]. After obtained unenhanced CT scan HAP scanning was initiated 25 seconds after initiation of contrast injection. Portal venous phase scanning was initiated 60-65 seconds after start of contrast injection. Equilibrium phase scanning was initiated after 180 seconds after the start of contrast injection.