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  • Radiographic quality control devices designed to measure the parameters that control the x-ray dose and the resulting image quality from individual x-ray systems, determining if the system is faulty or has been set up incorrectly. These devices consist of instruments that can measure at minimum the charge released and energy imparted into the patient by the x-rays (i.e., exposure and dose respectively), and the peak voltage in kilovolt applied between the electrodes of the x-ray tube (kVp); the product of the tube current in miliampere and exposure time in seconds (mAs) can also be measured but are not usually required for routine quality control (QC). X-ray QC devices are available in a variety of shapes and sizes, from self-contained units, incorporating all the needed control functions and radiation detectors in a single housing, to a set of separate units that should be combined to perform the measurements. Most x-ray QC devices are used to perform external QC measurement on radiographic, fluoroscopic, and conventional mammographic equipment; some can also be used for QC on dental, computed tomography and/or advanced mammographic equipment.
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