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post contraction activity is corrected for decay. The method assumes complete mixing of the radiotracer with bile. The EF can be overestimated if abundant stones or sludge are present because only the portion of the gallbladder volume filled with radiolabelled bile would be measured. The EF may have a role in evaluating patients

Figure 6. Gallbladder visualization after morphine. Images at 30 minutes in a 53 year old woman with unexplained acute right upper quadrant pain fail to show the gallbladder (a). It is well seen 15 mintues after morphine injection (b) excluding cystic duct obstruction and acute calculous cholecystitis.

Figure 6. Gallbladder visualization after morphine. Images at 30 minutes in a 53 year old woman with unexplained acute right upper quadrant pain fail to show the gallbladder (a). It is well seen 15 mintues after morphine injection (b) excluding cystic duct obstruction and acute calculous cholecystitis.

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