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Fig. 1 —Diagram shows active lower gastrointestinal bleeding
protocol. Fifty-five of 94 patients identified with active lower
gastrointestinal bleeding were imaged in the study with 60 contrast-enhanced
MDCT examinations performed in 55 patients. There were 41 cases with
contrast-enhanced MDCT matched with 99mTc-labeled RBC scanning.
Eighteen patients from these matched cases underwent angiography. Twenty-three
angiography examinations were performed in total, with five patients going
directly to angiography after contrast-enhanced MDCT.
