What are the most important features of intraoral examinations that contribute to dose reduction?
Many actions can be taken, such as: • Rectangular collimation which approximates the size and shape of the receptor reduces dose time volume significantly (to the tune of 60%) in comparison to circular collimation. • The fastest available film consistent with achieving satisfactory diagnostic results should be used. E-speed and F-speed films reduce dose more than 50% compared with D-speed films. • Digital detectors have the potential for further dose reduction, even compared with F-speed film, provided the repeat rate and use of higher exposure factors than necessary are controlled. • Using tube voltage in the range 60 to 70kV. • The X ray tube filtration should be sufficient to reduce entrance skin dose to the patient consistent with producing satisfactory image quality. • A position indication device which ensures a minimum focus-to-skin distance of 20 cm should be attached to the tube head (eg. by use of a long collimator/cone as opposed to a short conical one).
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