The Role of Different Imaging Methods in the Diagnosis of Gallbladder Polyps

CT examinations were performed using a 64-slice CT scanner. Arterial phase scanning was triggered by bolus tracking technique after 100 to 120 mL nonionic contrast material was injected through the antecubital vein. With a delay of 60 and 140 s after the beginning of contrast medium injection, portal venous and equilibrium phase image scanning were followed.

CEUS examinations were performed using a Philips iU 22 scanner with a 1-5 MHz（Mega Hertz, MHz）vector transducer. Traditional transabdominal ultrasound and CEUS were performed by the same investigator, one with more than 3 years experiences in CEUS. Traditional ultrasound was used initially to locate the lesion. The plane with the bottom of the lesion was selected for further examination. When multiple lesions were existed, the largest one was selected to evaluate. The target was placed in the center of the screen and was kept stable. Pulse inversion harmonic imaging with an index of 0.06 was used in CEUS examination. SonoVue, which contained sulfur hexafluoride microbubbles, was used as the contrast agent.