therefore , in 14 controls , 25 patients with radiolucent gallstones , and 14 patients with radiopaque gallstones , we used two techniques to measure gallbladder contraction -- radionuclide imaging and real-time ultrasound -- in response to one of two stimuli -- a lundh meal or intravenous cholecystokinin-octapeptide .
C0008350
gallstones
C0037167
cholecystokinin-octapeptide