Radiology (Cuban Guide)

All of the following are types of electromagnetic radiation EXCEPT one. Which is the

exception?

• a. X-rays

• b. Electrons

• c. Radar waves

• d. Microwaves

2. Choose the two items that influence the mean energy of an X-ray beam.

• a. Kilovoltage

• b. Milliamperage

• c. Amount of filtration

• d. Rectangular collimation

• e. Quantity of electrons in the tube current

3. The filament functions to:

• a. release photons.

• b. release electrons.

• c. convert electrons into photons

• d. convert photons into electrons.

• e. None of the above answers is correct

4. The term ALARA stands for:

• a. optimizing image quality.

• b. an algorithm for limiting patient exposure.

• c. reducing the costs of radiographic examinations.

• d. reducing patient exposure to as low as is reasonably achievable.

• e. a legal requirement to optimize occupational exposure in dental radiology.

5. X-ray film is composed of:

• a. fluorescent particles that react to X-radiation.

• b. sodium thiosulphate crystals suspended within a plastic base.

• c. a plastic base coated with silver halide crystals suspended in gelatin.

• d. silver halide crystals suspended in plastic and coated on a gelatin base.

6. It is generally desirable that X-ray films be all of the following except:

• a. high speed.

• b. fine grain size

• c. sensitive to visible light

• d. coated with emulsion on both sides.

7. You are unsure of the location of an opaque mass superimposed over the root of a mandibular premolar. A second view of the same region, made with the tubehead oriented more from the mesial, reveals that the object has moved mesially with respect to the premolar root as compared to the first radiograph. The object is located:

• a. buccal to the premolar root.

• b. lingual to the premolar root

• c. in the same buccal-lingual orientation as the premolar root.

• d. There is insufficient information to answer the question.

8. The traditional unit for measuring x-ray exposure in air is termed:

• a. the rad.

• b. the rem.

• c. the gray.

• d. the roentgen

• e. coulombs per kilogram.

9. If after development, a radiograph is too light, it may be an indication that:

• a. the exposure time was too long.

• b. the fixer solution needs changing.

• c. the developer solution was too hot.

• d. the film was not sufficiently washed

• e. the developer solution needs changing.

10. If an unwrapped, nonprocessed X-ray film is exposed to normal light for one second and then processed, it:

• a. will be completely clear.

• b. will be completely black.

• c. may still be used but will have a brown tint.

• d. may still be used but will show a decrease in density.

• e. may still be used but will show an increase in density.