radiology

t/f every patient should be evaluated individually for dental radiographs
True False

t/f the 8inch PID is more effective in reducing radiation exposure to the patient than the 16inch.
True False

t/f pointed cones should not be used because of increased scatter radiation.
True False

t/f the thyroid collar must be worn for all intraoral and extraoral films.
True False

t/f if necessary the dental radiographer may hold a film in the patients mouth to ensure a diagnostic image.
True False

which of the following describes the use of a filter in a dental xray tubehead
A. a filter reduces the size and shape of the beam
B. a filter remove the dose of radiation to the thyroid glad
C. a filter removes low energy xrays
D. a filter decrease the mean energy of the beam

which of the following is NOT a component of inherent filtration?
A. tubehead seal
B. unleaded glass window
C. a leaded cone
D. oil

which of the following is the most effective method of reducing patient exposure to radiation?
A. fast films
B. film-holding devices
C. round PID
D. lead apron

which of the following position indicating devices is most effective in reducing patient exposure?
A. conical PID
B. round PID
C. all are equally effective in reducing patient exposure
D. rectangular PID

which of the following devices restricts the size and shape of the xray beam?
A. collimator
B. barrier
C. filter
D. film badge

which of the following is used as a collimator?
A. lead plate
B. aluminum plate
C. copper plate
D. all of the above

which of the following describes the function of filtration?
A. increases scatter radiation
B. increases long wavelengths
C. reduces low energy waves
D. .increase divergent rays

which of the following is the recommended size of the beam at the patients face?
A. 4.0 inches
B. 3.50 inches
C. 2.75 inches
D. 3.25 inches

which of the following terms describes the dose of radiation that the body can endure with little or no chance of injury?
A. occupationally exposed dose
B. radiation limit
C. maximum permissible dose
D. ALARA

which of the following is TRUE of film badges.
A. film badge should be worn when the radiographer is under going xray exposure
B. film badges can be shared between employees
C. film badges should be worn at waist level when exposing xray films
D. all of the above are true.

provide the requirements for proper filtration:
a. machines operating at 70kVp or lower require ___mm aluminum
b.machines operating above 70kVp require ___mm aluminum

state the angle that the dental radiographer should stand to the primary beam ___-___ degrees

state the formula for maximum accumulated dose

wtate the maximum permissible dose for occupationally exposed persons ____ rems/year (____Sv/year)

state the maximum permissible dose for nonoccupationally exposed persons ____rem/year (___Sv/year)