Hepatobiliary imaging (HIDA) has an important role in the evaluation of the function and dynamics of the hepatobiliary system and the flow of bile to the gastrointestinal system. Contractility of the gallbladder is one of the functions that are uniquely evaluated using a HIDA scan. Poor contractility of the gallbladder can be the source of pain in many patients. Anatomic imaging studies like ultrasound, CT and/or MRI are usually normal in these patients.