Imaging Ch. 1, 2, 3
VT 181 review questions from chapters 1, 2 & 3 of Radiography in Veterinary Technology, 4th ed. By Lisa M. Lavin.
- 1.The negatively charged particle of an atom is the:
- A.
Proton
- B.
Neutron
- C.
Electron
- D.
Nucleus
- 2.As x-rays pass through materials, they have the ability to:
- A.
Cause substances to fluoresce
- B.
Completely remove an electron from an atom, leaving the atom positively charged
- C.
Cause chemical changes that can kill cells
- D.
All of the above
- 3.Which of the following statements is true?
- A.
X-rays with longer wavelengths penetrate farther than x-rays with shorter wavelengths.
- B.
X-rays with shorter wavelengths penetrate farther than x-rays with longer wavelengths.
- C.
Electromagnetic radiation with lower frequency has more penetrating power through space and matter.
- D.
Gamma rays are required for the production of a radiograph
- 4.Electrons travel:
- A.
Toward the cathode in an x-ray tube.
- B.
Away from the anode in an x-ray tube.
- C.
Toward the anode in an x-ray tube.
- D.
Within the nucleus of an atom.
- 5.In x-ray tubes, the majority of energy produced by the movement of electrons is in the form of:
- A.
Light
- B.
Heat
- C.
Sound
- D.
X-ray energy
- 6.On the electromagnetic spectrum, in relation to visible light, x-rays:
- A.
Have a longer wavelength.
- B.
Have a lower frequency.
- C.
Have a shorter wavelength.
- D.
Are closer in wavelength to infrared rays than light waves.
- 7.Bundles of energy that travel in a wave are called:
- A.
Photons
- B.
Quanta
- C.
All of the above
- 8.X-ray electromagnetic radiation travels in a straight line, the direction of which can be altered.
- A.
True
- B.
False
- 9.A radiograph is synonymous with an x-ray
- A.
True
- B.
False
- 10.X-rays were discovered by Wilhelm Conrad Roentgen in the year _____?
- 11.Filaments located in an x-ray tube:
- A.
Are made of molybdenum.
- B.
Must have a low melting point and low atomic number.
- C.
Are found in the anode.
- D.
Emit electrons when heated.
- 12.The anode's target:
- A.
Is composed of tungsten.
- B.
Reaches temperatures in excess of 1000 degrees C during x-ray production.
- C.
Usually has a copper base.
- D.
All of the above.
- 13.Which of the following are limitations of the stationary anode?
- A.
The target is made of tungsten.
- B.
It is unable to withstand large amounts of heat.
- C.
If the target becomes pitted, radiographs appear darker.
- D.
It is limited to a larger focal spot to accomodate higher temperatures.
- 14.How can the technician help to prolong the life of the filament in the x-ray tube?
- A.
Enter the proper exposure settings in the control panel before the final positioning of the animal.
- B.
Leave the s-ray unit on at all times to ensure that the filament is heated when the radiograph is requested.
- C.
Always leave the x-ray unit in the standby mode.
- D.
The technician can do nothing because filament defects are largely the fault of the maufacturer.
- 15.Which of the following are possible effects of excessive heat within an x-ray tube?
- A.
Bearing failure and decreased anode speed.
- B.
Roughened target surface.
- C.
Arcing.
- D.
All of the above.
- 16.A small amount of air within the glass envelope is beneficial because it helps to dissipate heat.
- A.
True
- B.
False
- 17.Veterinary patients have a tendency to move while being positioned for radiographs to be taken. The radiographer should help to safely prevent artifacts of movement by:
- A.
Using the shortest exposure time possible.
- B.
Altering the direction in which x-rays move.
- C.
Selecting a longer exposure time than is recommended.
- D.
Sedating all patients before taking radiographs.
- 18.Which of the following is recommended to reduce unnecessary radiation of the patient or persons restraining the patient and to decrease scatter radiation?
- A.
Opening the collimator as wide as possible.
- B.
Placement of a lead apron over the area of interest on the patient.
- C.
Selection of full-wave rectification as opposed to half-wave rectification.
- D.
Adjustment of the collimator so that the smallest field size possible is used.
- 19.Which of the following is a type of somatic damage caused by radiation?
- A.
Gene mutation
- B.
Cataracts
- C.
Sterility
- D.
None of the above
- 20.Genetic damage is not detectable until future generations are produced.
- A.
True
- B.
False
- 21.What is the upper limit of exposure that an occupationally exposed individual may receive according to state and federal regulations?
- A.
0.5 Sv/year
- B.
100 rem/year
- C.
0.05 Sv/year
- D.
0.005 Sv/year
- 22.All of the following are true except:
- A.
Animals cells are not as susceptible to damage from irradiation as human cells.
- B.
Radiation can affect the body's ability to produce red and white blood cells.
- C.
Exposure to radiation can affect the lens by causing cataracts.
- D.
Individuals younger than 18 years of age may not assist with animal restraint while radiographs are taken.
- 23.What type of dosimeter can be stored for years, maintain its information, and can be reused?
- A.
Pocket ionization chamber
- B.
Collimator
- C.
Thermoluminescent dosimeter
- D.
Film badge
- 24.Scatter depends on:
- A.
The intensity of the beam
- B.
The composition of the structure being radiographed
- C.
Kilovoltage (kVp) level
- D.
All of the above
- 25.What is the thickness of the lead-lined rubber lining protective apparel in veterinary radiography?
- A.
1 cm
- B.
10 mm
- C.
0.5 mm
- D.
0.5
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