Interpretation of multiphasic CT enterography in obscure GI bleeding requires the following considerations except:
a. An initial search is performed of images in the arterial phase for high attenuation structures, which are then correlated on the subsequent phase of enhancement todistinguish small bowel lesions from intraluminal debris and bleeding.
b. Debris often possesses obscure edges and should change over multiple phases.
c. A progressive accumulation of intraluminal contrast signals active bleeding.
d. Focal regions of bowel well thickening or intraluminal filling defects that are notdebris, will change in enhancement over time.