Abstract
Current B-mode gray scale imaging systems have proven extremely useful in evaluating abdominal disease by revealing the detailed visceral and vascular anatomy of the upper abdomen. With the commercially available static scanners, the abdomen is best examined in single sector sweeps while the patient suspends respiration. Using this technique, investigators have reported visualization of the superior mesenteric artery and vein, splenic, portal, and renal veins, and the pancreas (2,5). Ultrasonic examination of this intricate upper abdominal anatomy can be facilitated by using a real time scanner because the optimal scanning planes are delineated under simultaneous visual guidence. Ideally, a real time scanner should be easy to position around the ribs and be capable of displaying a gray scale image with a resolution similar to that obtained with the static scanners.
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