Radiology 5
- 1.Which of the following materials is most resistant to x radiation?
- A.
Copper
- B.
Molybdenum
- C.
Tungsten
- D.
Lead
- E.
Aluminum
- 2.The intensity of the beam is affected by the
- A.
Kilovolt peak
- B.
Milliamperage
- C.
Exposure time
- D.
Focal film distance
- E.
All of the above
- 3.How many times per second is the polarity reversed in a dental xray machine operating on an alternating current?
- A.
30
- B.
15
- C.
60
- D.
45
- 4.For x ray timers calibrated in impulses how many impulses are there in a second?
- A.
10
- B.
30
- C.
60
- D.
120
- E.
15
- 5.In 16 inch cylinder is used in the paralleling technique to
- A.
Reduce secondary radiation
- B.
Avoid magnification of the image
- C.
Avoid distortion of the image
- D.
Avoid superimposition of anatomic structures
- E.
Facilitate correct vertical angulation of the position indicating device pid
- 6.Use of a kilovolt peak between 45 65 profuces
- A.
Scatter radiation
- B.
Fogging
- C.
A blurred image
- D.
An underexposed film
- E.
None of the above
- 7.The difference in degrees of blackness on a radiograph is called
- A.
Density
- B.
Tone
- C.
Contrast
- D.
Fogging
- E.
Shades
- 8.A long FFD is desirable because
- A.
More radiation is absorbed by the tissues
- B.
The resulting radiation is more penetrating
- C.
More soft radiation strikes the object
- D.
The central rays of the primary beam are less divergent
- E.
Overexposure rarely occurs
- 9.Radiographs should always be viewed
- A.
In a well lit room
- B.
On a viewbox
- C.
In the operatory
- D.
By holding them up to a celling light
- E.
Using hight from a window
- 10.If the intensity of a beam of radiation is 12 at a point 12 inches from the target the intensity of the beam at 24 inches is
- A.
2
- B.
3
- C.
4
- D.
5
- E.
6
- 11.The best way to clean the intensifying screens in extraoral cassettes is with
- A.
Detergent
- B.
Disinfectant solution
- C.
Cold sterillizing solution
- D.
Soapy water
- E.
A wire brush
- 12.Film fog occurs when all or part of a radiograph is darkened by
- A.
An imbalance or exhaustion of processing solutions
- B.
A light leak
- C.
Improper safelighting
- D.
Improper safelilghting
- E.
All of the above are potential sources
- 13.Which of the following statement is false concerning film duplication?
- A.
The films to be duplicated are in close contact with the duplicating film.
- B.
The shiny side of the film is the nonemulsion side
- C.
If less film density is needed on the duplicate radiograph the exposure time is shortened.
- D.
The raised portion of the orientation dot faces toward the light source
- E.
The radiographs being duplicated should be removed from their respective mounts.
- 14.Flexible cassettes are
- A.
Not used because of cracking of the emulsion
- B.
Are used in all panoramic units
- C.
Are used in some panoramic units
- D.
Are used for lateral oblique projections only
- E.
None of the above
- 15.Intraoral film packets must be
- A.
Resistant to salivary seepage
- B.
Flexible
- C.
Light tight
- D.
Easy to open in the darkroom
- E.
All of the above
- 16.To what does the term film speed refer?
- A.
The developing time needed
- B.
Sensitivity to x radiation
- C.
Half life
- D.
Degree of blackness on the exposed radiograph
- E.
Shelf life
- 17.The advantage of a film that has emulsion on both sides is that
- A.
The film requires less radiation exposure
- B.
The image produced is less distorted
- C.
The film has less sensitivity to radiation
- D.
Processing solutions work better
- E.
The film is easier to mount
- 18.Which of the following film sizes is considered to be standard adult film?
- A.
Size#0
- B.
Size#1
- C.
Size#2
- D.
Size#3
- E.
Size#4
- 19.Nonscreen film is routinely used in extraoral radiography
- A.
True
- B.
False
- 20.The advantage of a film that has emulsion on both sides is that
- A.
The film requires less radiation exposure
- B.
The image produced is less distorted
- C.
The film has less sensitivity to radiation
- D.
Processing solutions work better
- E.
The film is easier to mount
- 21.The intensifying screen that emits blue light and must be used with film that is sensitive to blue light is a
- A.
Nonlight screen
- B.
Calcium tungstate screen
- C.
Rare tungstate screen
- D.
Rare earth screen
- E.
Phosphor calcium screem
- 22.The device that converts x ray energy into visible light is called a(n)
- A.
Cassette holder
- B.
Step down transformer
- C.
Intensitying screen
- D.
Nonscreen film
- E.
Screen film
- 23.Intraoral film packets must be
- A.
Resistant to salivary seepage
- B.
Flexible
- C.
Light tihgt
- D.
Easy to open in the darkroom
- E.
All of the above
- 24.If the intensitying screens are not in perfect contact with the film which of the following will occur?
- A.
The screen may be damaged
- B.
The film may be damaged
- C.
There will be a light leak
- D.
There will be a loss of image sharpness
- E.
A thin film will result
- 25.What is the major advantage in using the fastest speed film and high kilovolt peak?
- A.
It increases film density
- B.
It increases film contrast
- C.
It produces a clearer image
- D.
It reduces the radiation exposure to the patient
- E.
It makes film easier and faster to develop
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