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kilovoltage or kilovoltage peak (KVP)
the peak voltage used during the exposure (deal with wavelength, density, and color)
the restriction (piece inside machine) of the size and shape of the x-ray beam (creates the primary beam)
inverse square law
the intensity of radiation is inversely proportional to the square of the distance from the source of radiation
paralleling techniques (XCP) dealing with PA's
film is placed parallel to the long axis of the tooth, the central ray is perpendicular to the long axis of the tooth and film holder
advantages of paralleling techniques
advantages-produces without dimensional distortion, easier to get the correct angle, able to recreate the exact angle again
bisecting techniques dealing with PA's
film is placed on an angle to bisect the long axis of the tooth, central ray is perpendicular to the long axis of the tooth and film holder
advantages of bisecting techniques
advantage-decreased exposure time, doesn't need to use film holder if patient's anatomy doesn't allow
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