DASA x-ray exam 2024 with Questions and Correct Answers Verified Solutions
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Course
DASA
Institution
DASA
Outer package to prevent moisture, Dental film(1-2), Black paper (protect from light),
Lead foil(absorbs scattered radiation)
What is included in a film packet?
Roentgen, Rad, Rem
Traditional units of radiation measurements
Coulombs per kilogram (C/kg), Gray (Gy), Sievert (Sv)
SI units of rad...
DASA x-ray exam 2024 with Questions and
Correct Answers\ Verified Solutions
Outer package to prevent moisture, Dental film(1-2), Black paper (protect from light),
Lead foil(absorbs scattered radiation)
What is included in a film packet?
Roentgen, Rad, Rem
Traditional units of radiation measurements
Coulombs per kilogram (C/kg), Gray (Gy), Sievert (Sv)
SI units of radiation measurements
Radiation Exposure
the amount of radiation a person is exposed to. This is measured in (c/Kg) or (R) units
Absorbed dose
the amount of energy absorbed per unit mass (tissue). This is measured in (Gy) or (rad)
units
Dose Equivalent
A measurement used to compare the biologic effects of different types of radiation on
tissues of the body. This is measured in (Sv) or (rem) units.
Maximum Permissible Dose (MPD)
the maximum dose of radiation a person may receive in a given time period.
ALARA concept
Concept of radiation protection that states that all exposures should be kept "as low as
reasonably achievable"
acute radiation exposure
radiation resulting from a massive, short-term, ionizing dose, such as a nuclear accident.
Chronic radiation exposure
When small amounts of radiation are absorbed repeatedly over a long period. The
effects of chronic exposure may not be observed until years after the originial exposure.
, Genetic cells
Radiation damage to these cells may be passed to subsequent generations. Also known
as the reproductive cells.
somatic cells
Radiation damage to these cells CANNOT be passed to subsequent generations. Also
known as the cells of the body.
Caries, Porcelain, Abscess, Cysts, Soft tissue, Sinuses
What are some conditions that would appear radiolucent in an xray?
Metallic restorations, Bone, Enamel, Dentin, Ortho wires, Gutta percha, Calculus
What are some conditions that would appear radiopaque in an xray?
Milliampere (mA)
When this setting is increased, more photons will be produced and the xray image
appears darker or more dense.
Kilovoltage peak (kVp)
Increasing this setting increases the energy of the xray photons therefore increasing
density in the image.
Exposure time
Increasing this setting increases the amount of time that photons can affect the film
therefore making the image more dense.
Radiographic contrast
the density difference between two adjacent areas on a radiograph
Short scale
the term used when considerable or major differences between gray shades are present
(high contrast) but the total number of gray shades is small (lower than 70kvp)
Long scale
term used when slight differences between gray shades are present (low contrast) but
the total number of gray shades is great (greater than 85kvp)
Calculus (tartar), Overhanging restorations
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