Contrast-enhanced ultrasonography using the agent detection imaging (AD[) mode was rnrxiurted in 6 patients with gastrointestinal diseases to examine the hemodynanucs.
In 3 cases of advanced colorectal cancers, abundant tumor microvessels showing a complicated network and uneven internal perfusion were depicted. In 1 case each of polyp-shaped colorectal adenoma and gastric adenocarcinoma. even perfusion was observed from the vascular structure radiating from the base of tumor. In 1 case of colitis, diffuse punctuate opacification was found in the hypertrophied wall, and a ring-shaped non-pacified region resembling a muscular layer was observed outside the area of even perfusion.
Contrast-enhanced ultrasonography using the ADI mode has high sensitivity, and high temporal and spatial resolution, permitting detailed study of heinudynarrrics. These results suggest that this method may be useful for differential diagnosis of gastrointestinal diseases and estimation of wall invasion.

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