Figure 2.

Variation of effective dose, E, with different fields of view (FOV) size, milliamperage (mA) and peak kilovoltage (kVp). In this graph, the effective doses for the 30 cm FOV, 23 cm FOV and 15 cm FOV cone beam CT examinations centred over the left submandibular gland are compared with E for the collective series of plain radiographs made during sialography of the same gland. The plain radiograph series included one panoramic radiograph, one mandibular standard occlusal and four lateral skull radiographs