Dental Radiology Final Exam Review Latest Update 2023-2024 100 Questions and Verified Correct Answers Guaranteed Success ___ is the measurement of the number of electrons moving through a conductor. -
CORRECT ANSWER: Amperage
____ refers to the quantity of radiation received or the total amount of radiation energy
absorbed. - CORRECT ANSWER: Total Dose
A ghost image appears larger and ____ than its actual counterpart. - CORRECT
ANSWER: More indistinct
According to the current recommendations (2003) of the National Council on Radiation Protection and Measurements, the current MPD for an occupationally exposed pregnant women is the same as that for: - CORRECT ANSWER: A nonoccupationally exposed person.
According to the current recommendations (2003) of the National Council on Radiation Protection and Measurements, the current MPD for occupationally exposed persons is
____/year. - CORRECT ANSWER: 5 rem
According to the inverse square law, if the length of the PID is doubled, the resultant
beam is ____ as intense. - CORRECT ANSWER: one quarter
According to the inverse square law, the intensity of radiation is ____ proportional to the ____ from the source of radiation. - CORRECT ANSWER: inversely; square of the distance
Aluminum filters are used to remove ____-energy, ____ -wavelength x-rays. -
CORRECT ANSWER: low energy and longer wavelengths
An exhausted developer produces a radiograph with what type of density and contrast?
- CORRECT ANSWER: reduced density and contrast
An increase in density comes from an increase in what other factor? - CORRECT
ANSWER: kVP or mAs
Approximately what percentage of the kinetic energy of the electrons is converted to x-
rays at the anode? - CORRECT ANSWER: less than 1%
Developer cutoff has what kind of appearance? - CORRECT ANSWER: Straight white
border on the film
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Extraoral films are primarily used in what specialty areas? - CORRECT ANSWER:
Oral Surgery and Orthodontics
How can you test an automatic processor? - CORRECT ANSWER: Unwrap two
unexposed films, expose one to light, and then process both films
How is a film badge work by the operator? - CORRECT ANSWER: usually at waist
level
How is exposure time measured? - CORRECT ANSWER: in impulses
How is informed consent obtained? - CORRECT ANSWER: Informed consent must be
presented in a language that the patient will understand, it requires that patients have their questions answered before x-ray exposure/treatment, that patients receive enough information to make informed choices, and if the patient is a minor it must be obtained from a parent or legal guardian.
How is the film emulsion attached to the film? - CORRECT ANSWER: to both sides of the film
How much exposure time does a two-film packet require compared to a one-film
packet? - CORRECT ANSWER: the same exposure time
If the anterior teeth appear "fat" on a panoramic radiograph, what error did the patient
make? - CORRECT ANSWER: Teeth are positioned too far back on the bite-block.
In dental radiography, the term ____ is used to describe the mean energy or
penetrating ability of the x-ray beam. - CORRECT ANSWER: Quality
Milliamperage regulates the ____ of electrons produced at the cathode filament. -
CORRECT ANSWER: quantity (number of electrons)
Milliampere-seconds is a combination of milliamperes and ____? - CORRECT
ANSWER: exposure time
On some dental x-ray machines, only the ____ can be altered; the other parameters
are preset by the manufacturer. - CORRECT ANSWER: exposure time
On what type of films are the apex (tip) of the tooth roots seen? - CORRECT
ANSWER: Periapical and Occlusal
Radiation legislation varies greatly from state to state. For example, in some states a dental radiographer must successfully complete a radiation safety examination before he or she may expose dental x-rays.
- Both statements are true.
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