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Endoscopic magnetic resonance imaging (MRI) coils designed for introduction through the throat and into the esophagus to obtain high-resolution imaging of the esophagus, stomach, and surrounding anatomic structures. These coils typically consist of isolated independent concentric spirals of conducting rings that resonate at radiofrequencies; the coils are placed inside of a dedicated probe allowing easy insertion. The probe is attached to an external unit for procedure control and contrast media infusion; esophageal coils usually need special interface devices for use with particular MRI scanning systems. Esophageal MRI coils usually are compatible with only one or a few specific models of MRI systems. They are mostly used in the detection and staging of cancer tumors and other diseases of the imaged regions.
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