A doctor thinks a patient has an intussusception, in which a part of the intestine slides inside itself like the parts of a collapsible telescope. Which imaging technique is the doctor most likely to use? Explain.

Sonography (ultrasound) is commonly used to diagnose intussusception. It can show the characteristic nested appearance of one section of intestine inside another, provides useful detail, and does not expose the patient to ionizing radiation. Fluoroscopy can show movement in real time, but it is not usually the first imaging test for suspected intussusception.

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