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Radiographic units consisting of a manually driven or motor-driven wheeled cart that transports an x-ray generator, an x-ray tube and tube stand, collimators, and a film cassette or flat-panel detector storage drawer (for film and digital units respectively). There are three different types of mobile radiographic units, which are categorized according to the generator: line-powered transformers, capacitor-discharge generators, and battery-powered transformers. Most mobile radiographic units utilize one of several types of digital imaging; advantages of digital imaging over film include greater dynamic range, reduced patient radiation exposure, and the ability to integrate with digital picture archiving and communication systems (PACS). Mobile radiographic units are used for imaging patients who cannot be moved to the radiology department or when patient transport is contraindicated, such as for patients in intensive care and critical care units or operating and emergency rooms.
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