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jackiedh
on FreezingBlue Flashcards.
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who is responsible for prescribing the dental radiographs?
dentist
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what professional judgement does the dentist use to make a decision about? (3)
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T/F only some patients should be evaluated for dental radiographs on an individual basis.
false! (every patient)
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what are the two types of filtration?
- inherent filtration
- added filtration
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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
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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
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what is the purpose of aluminum disks?
to filter out longer, low energy x-rays from the x-ray beam
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which wavelengths are harmful to the patient?
low energy, long wavelengths
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T/F filtration of the x-ray beam results in a higher energy and more penetrating useful beam
true
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what is the total filtration amount required to be when using below 70 kVp?
at least 1.5 mm aluminum filtration
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what is the total filtration required for operating a machine above 70 kVp?
at least 2.5 mm aluminum filtration
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________ is used to restrict the _______ and _______ of the x-ray beam to reduce patient exposure
- collimation
- size and shape
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what shapes can the lead of the collimator be?
round or rectangle
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T/F a circular collimator produces a cone shaped beam that is 2.75 inches in diameter
true
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rectangle collimator is just larger than a size ____ film
2
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which pid shape is the most effective to reduce radiation exposure?
rectangle
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round and rectangle come in ___ and ___ inches
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is a conical PID used?
no
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is a long or short pid preferred?
long; less divergence of x-ray beam
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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
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