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NDAEB – Radiology: Questions And Correct Answers
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NDAEB – Radiology: Questions And Correct Answers
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NDAEB – Radiology: Questions And Correct AnswersWho discovered xrays: Right Ans - Wilhelm Conrad Roentgen
All xray machines have three primary components: Right Ans - Tubehead
Extension arm
Control panel
The housing Right Ans - metal body that contains the xray tube
Insulating oil Right Ans - Fills the housing and surrounds the xray tube.
Prevents overheating by absorbing the heat
The tubehead seal Right Ans - made of leaded glass or aluminum and it
keeps the oil in the tubehead and acts as a filter to the x-ray beam.
Xray beam Right Ans - where xrays are produced
Transformer Right Ans - device that alters the voltage of incoming
electricity
PID Right Ans - lead lined, used to aim xray beam at the film in patients
mouth
Xray Tube Right Ans - heart of the xray generating system
cathode Right Ans - Negative electrode that supplies the electrons
necessary to generate xrays.
Anode Right Ans - Positive electrode that is composed of tungsten
embedded in the larger copper stem. The copper around the target conducts
the heat away from the target thus reducing wear on the target
The control panel contains : Right Ans - Master switch, indicator light,
selector buttons, exposure button
The exposure time is measured in: Right Ans - Fractions of a second called
impulses
60 impulses=1sec
, Purpose of the step-down transformer Right Ans - decrease voltage from
the incomming 110-220 to 3-5 volts
what is thermionic emission? Right Ans - the release of electrons from a
heated filament
Xradiation is described as: Right Ans - Primary, secondary, or scatter
radiation
Primary radiation is considered: Right Ans - Useful beam or primary beam
Secondary radiation is: Right Ans - not useful radiation
produces fog on radiographs
Scatter radiation Right Ans - A form of secondary radiation that occurs
when an x-ray beam has been deflected from its path by interaction with
matter- damaging to both the patient and the operator
During the production of xrays, how much energy is lost as heat? Right Ans
- 99%
What are the three types of radiation: Right Ans - Primary, secondary, and
scatter radiation
Charactaristics of the xray beam are described as: Right Ans - Quality
Quantity
Intensity
Qualities necessary for a good image: Right Ans - Contrast
Density
Image detail
Dense objects appear: Right Ans - Radiopaque
Five surfaces that appear radiolucent (dark) on an image: Right Ans - Soft
tissues
Air spaces
abscesses
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