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Variation of effective dose, E, with different fields of view (FOV) size, milliamperage (mA) and peak kilovoltage (kVp) settings. This graph compares E for the different cone beam CT techniques that were centred on the left parotid gland with the E calculated for the collective plain radiographs made during a sialography procedure of the same gland. The plain radiographs included one panoramic radiograph, two anterior–posterior skull radiographs and four lateral skull radiographs
