Magnetic resonance imaging (MRI) and magnetic resonance cholangiopancreatography (MRCP)

Magnetic resonance imaging, or MRI, is a method of taking pictures of internal organs. The patient is scanned by a tubelike machine with a powerful magnet, which generates images from inside the body. Magnetic resonance cholangiopancreatography (MRCP) is a relatively new application of MRI technology using special software. The images it produces are similar to those produced during endoscopic retrograde cholangiopancreatography (ERCP), in which the doctor gets images by having the patient swallow a flexible tube--an endoscope. But in MCRP, the risks of sedation and perforation inherent in endoscopic techniques are avoided. The test is very helpful in assessing obstruction of the bile ducts, inflammation of the gallbladder, and the anatomy of the pancreatic ducts.

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However, MRCP is only a diagnostic test and cannot be used for treatment if an obstruction is found. Also, the test is not advised for patients with certain metallic implants or devices, since high magnetic fields are involved.