US researchers say a pill-size device fed down the throat can detect conditions in the esophagus at a fraction of the cost of an endoscopic examination. Researchers at the Wellman Center for Photomedicine at Massachusetts General Hospital said the device offers a new method for detecting cancers and other throat ailments by taking microscopic images as it is fed down through the throat, Red Orbit reported Monday. A main use of the device would be to scan for a condition known as Barrett\'s esophagus, a pre-cancerous condition often caused by long-term exposure to stomach acid, researchers said. About the size of a multivitamin and equipped with an infrared light source and sensors, the device can capture a detailed, microscopic image of the esophagus wall while providing a number of advantages over traditional endoscopy, they said. \"This system gives us a convenient way to screen for Barrett\'s that doesn\'t require patient sedation, a specialized setting and equipment, or a physician who has been trained in endoscopy,\" Dr. Gary Tearney, the study author, said. \"By showing the three-dimensional, microscopic structure of the esophageal lining, it reveals much more detail than can be seen with even high-resolution endoscopy.\" A small tether is connected to the imaging device, which is swallowed by the patient, allowing a health professional to control the system during the procedure and remove it when the examination is complete, researchers said.