BU Dental Radiology EXAM with correct
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answers
What does the x-ray tube contain? - CORRECT ANSWERS ✔✔cathode anode
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and focusing cup
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Who discovered what x-rays were? - CORRECT ANSWERS ✔✔Wilhelm
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Conrad Roentgen ||
Properties of Xrays - CORRECT ANSWERS ✔✔1. X-rays are weightless
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package of pure energy || || || ||
2. They have no electrical charge
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3. They travel at the speed of light
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4. They travel in straight line but diverge from a central focus
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5. They have enough energy to ionize and cause biological damage
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6. They can cause certain substances to fluoresce and affect photographic film.
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In a dental x-ray tube the electrons are emitted from the what? - CORRECT
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ANSWERS ✔✔Cathode (-) || ||
X-ray is produced when electrons moving at a high speed hit the tungsten
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target in a x-ray tube. - CORRECT ANSWERS ✔✔True
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,an assistant may hold the film or sensor in place for the pt during exposure -
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CORRECT ANSWERS ✔✔False || ||
As soon as a film or sensor is placed in a pt's mouth it is considered
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contaminated? - CORRECT ANSWERS ✔✔True || || || ||
X-rays are ionizing radiation. - CORRECT ANSWERS ✔✔True
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Bitewings show what? - CORRECT ANSWERS ✔✔Crowns and permant
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fixtures are interporximal surfaces of the teeth.
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In the paralleling technique the xray is directed perpendicular to the bisecting
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line between the angle of the long axis of the tooth and the film/sensor -
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CORRECT ANSWERS ✔✔True, explain.. So when you are parallelling, the
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angle you make when you are bisecting is perpendicular to the angle
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Pt;s should be drapped with a led apron prior to any radiographic images? -
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CORRECT ANSWERS ✔✔True || ||
Which if not a safety precaution for taking x-rays?
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-Always stand behind an appropriate barrier?
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-Never stand in the path of primary radiation
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-Never stabilize the tube head during radiation
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-If neccessary hold the film in the pt's mouth - CORRECT ANSWERS ✔✔If
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neccessary hold the film in the pt's mouth, never hold the film or sensor in
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the pts mouth.
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, X-rays travel at the speed of light? - CORRECT ANSWERS ✔✔True
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Nerve cells can be regennerated? - CORRECT ANSWERS ✔✔False, No-
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Dense things like bone can and perm fixtures, restorations.
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Which of these have an infulence on radiation protection?
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-Safe equipment||
-Skilled operator ||
-Lead aprons and thyroid collars
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-All of the above - CORRECT ANSWERS ✔✔All of the above
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primary radiation - CORRECT ANSWERS ✔✔travels from source to detector
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(useful)
scatter radiation - CORRECT ANSWERS ✔✔changes direction during passage
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through intervening med
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Leakage radiation - CORRECT ANSWERS ✔✔: radiation that originates from
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the X-ray tube and is not the primary beam.
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Filters in an x-ray tube is made of what? - CORRECT ANSWERS
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✔✔Aluminum
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answers
What does the x-ray tube contain? - CORRECT ANSWERS ✔✔cathode anode
|| || || || || || || || || || ||
and focusing cup
|| ||
Who discovered what x-rays were? - CORRECT ANSWERS ✔✔Wilhelm
|| || || || || || || || ||
Conrad Roentgen ||
Properties of Xrays - CORRECT ANSWERS ✔✔1. X-rays are weightless
|| || || || || || || || || ||
package of pure energy || || || ||
2. They have no electrical charge
|| || || || || ||
3. They travel at the speed of light
|| || || || || || || ||
4. They travel in straight line but diverge from a central focus
|| || || || || || || || || || || ||
5. They have enough energy to ionize and cause biological damage
|| || || || || || || || || || ||
6. They can cause certain substances to fluoresce and affect photographic film.
|| || || || || || || || || || ||
In a dental x-ray tube the electrons are emitted from the what? - CORRECT
|| || || || || || || || || || || || || ||
ANSWERS ✔✔Cathode (-) || ||
X-ray is produced when electrons moving at a high speed hit the tungsten
|| || || || || || || || || || || || ||
target in a x-ray tube. - CORRECT ANSWERS ✔✔True
|| || || || || || || ||
,an assistant may hold the film or sensor in place for the pt during exposure -
|| || || || || || || || || || || || || || || ||
CORRECT ANSWERS ✔✔False || ||
As soon as a film or sensor is placed in a pt's mouth it is considered
|| || || || || || || || || || || || || || || ||
contaminated? - CORRECT ANSWERS ✔✔True || || || ||
X-rays are ionizing radiation. - CORRECT ANSWERS ✔✔True
|| || || || || || ||
Bitewings show what? - CORRECT ANSWERS ✔✔Crowns and permant
|| || || || || || || || ||
fixtures are interporximal surfaces of the teeth.
|| || || || || ||
In the paralleling technique the xray is directed perpendicular to the bisecting
|| || || || || || || || || || ||
line between the angle of the long axis of the tooth and the film/sensor -
|| || || || || || || || || || || || || || || ||
CORRECT ANSWERS ✔✔True, explain.. So when you are parallelling, the
|| || || || || || || || || ||
angle you make when you are bisecting is perpendicular to the angle
|| || || || || || || || || || ||
Pt;s should be drapped with a led apron prior to any radiographic images? -
|| || || || || || || || || || || || || ||
CORRECT ANSWERS ✔✔True || ||
Which if not a safety precaution for taking x-rays?
|| || || || || || || ||
-Always stand behind an appropriate barrier?
|| || || || ||
-Never stand in the path of primary radiation
|| || || || || || ||
-Never stabilize the tube head during radiation
|| || || || || ||
-If neccessary hold the film in the pt's mouth - CORRECT ANSWERS ✔✔If
|| || || || || || || || || || || || ||
neccessary hold the film in the pt's mouth, never hold the film or sensor in
|| || || || || || || || || || || || || || ||
the pts mouth.
|| ||
, X-rays travel at the speed of light? - CORRECT ANSWERS ✔✔True
|| || || || || || || || || ||
Nerve cells can be regennerated? - CORRECT ANSWERS ✔✔False, No-
|| || || || || || || || || ||
Dense things like bone can and perm fixtures, restorations.
|| || || || || || || ||
Which of these have an infulence on radiation protection?
|| || || || || || || ||
-Safe equipment||
-Skilled operator ||
-Lead aprons and thyroid collars
|| || || ||
-All of the above - CORRECT ANSWERS ✔✔All of the above
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primary radiation - CORRECT ANSWERS ✔✔travels from source to detector
|| || || || || || || || ||
(useful)
scatter radiation - CORRECT ANSWERS ✔✔changes direction during passage
|| || || || || || || ||
through intervening med
|| || ||
Leakage radiation - CORRECT ANSWERS ✔✔: radiation that originates from
|| || || || || || || || || ||
the X-ray tube and is not the primary beam.
|| || || || || || || ||
Filters in an x-ray tube is made of what? - CORRECT ANSWERS
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✔✔Aluminum
