Card Set Information
week 5 radiation protection radiography
who is responsible for prescribing the dental radiographs?
what professional judgement does the dentist use to make a decision about? (3)
T/F only some patients should be evaluated for dental radiographs on an individual basis.
false! (every patient)
what are the two types of filtration?
what is inherent filtration?
when the primary beam passes through the glass window of the x-ray tube, insulating oil, and tubehead seal
=.5-1 mm aluminum
added filtration is required
what is added filtration?
the placement of aluminum disks in the path of the x-ray beam between the collimator and the tubehead seal in the dental x-ray machine
aluminum disks can be added to the tubehead in .5 mm increments
what is the purpose of aluminum disks?
to filter out longer, low energy x-rays from the x-ray beam
which wavelengths are harmful to the patient?
low energy, long wavelengths
T/F filtration of the x-ray beam results in a higher energy and more penetrating useful beam
what is the total filtration amount required to be when using below 70 kVp?
at least 1.5 mm aluminum filtration
what is the total filtration required for operating a machine above 70 kVp?
at least 2.5 mm aluminum filtration
________ is used to restrict the _______ and _______ of the x-ray beam to reduce patient exposure
size and shape
what shapes can the lead of the collimator be?
round or rectangle
T/F a circular collimator produces a cone shaped beam that is 2.75 inches in diameter
rectangle collimator is just larger than a size ____ film
which pid shape is the most effective to reduce radiation exposure?
round and rectangle come in ___ and ___ inches
is a conical PID used?
is a long or short pid preferred?
long; less divergence of x-ray beam
T/F the thyroid collar is used for both intraoral and extraoral films
false! only intraoral films, but the lead apron is used for both