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34 Cards in this Set
- Front
- Back
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The exposure error of foreshortening of the image is caused by:
A- Movement of the patient during exposure B-Improper film to tooth positioning C- Excessive vertical angulation D- Insufficent vertical angulation |
C- Excessive vertical angulation
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The area of sharp focus in the panoramic radiography is known as the :
A- Exposure zone B- Focal trough C-Aiming groove D- tomographic zone |
B- Focal trough
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When the patient is properly positioned in the panoramic machine, they should feel:
A- Very Comfortable B- Nervous C- Like they will fall backwards if they let go of the handholds D- Like they are leaning forward |
C- Like they will fall backwards if they let go of the handholds
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Which of the following describe Ionization?
A- An atom without a nucleus B- An atom that loses an electron C- An atom with equal numbers of protons & electrons D- None of the above |
B- An atom that loses an electron
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The quality of the x-ray beam is controlled by:
A- kVp B- mA C- Exposure Time D- Source to film distance |
A- kVp
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A white, inverted V- shaped radiopacity on the bottom of the film is most likely caused by:
A- Ghost image of metal jewelry B- Ghost image of hyoid bone C-Lead apron artifact D- Damaged cassette |
C- Lead apron artifact
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Increasing mA results in an increase in:
A- frequency of the wave B-Energy of the beam C-Number of x-rays produced |
C-Number of x-rays produced
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A radiography that has many light and dark areas with shades of gray is said to have:
A-High density B-Low density C-High Contrast D-Low Contrast |
C-High Contrast
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The latent period in radiation biology is the period of time between:
A-Exposure of film & development B- Subsequent doses of radiation C-Cell rest & cell mitosis D- Exposure to x-radiation & clinical symptoms |
D- Exposure to x-radiation & clinical symptoms
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A diagnostic film is produced using 90 kVp and .25 seconds. What exposure time is needed to produce the same film at 75 kVp-?
A- 0.50 seconds B- 0.75 seconds C- 1.00 seconds D- 1.25 seconds |
A- 0.50 seconds
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If kVp is decreased with no other variations in exposure factors, the film will:
A-Appear Lighter B-Appear darker C-Remain the same D-Either a or b |
A- Appear Lighter
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Which of the following is most susceptible to ionizing radiation?
A-Bone Tissue B-Small lymphocyte C-Muscle tissue D-Nerve tissue |
B-Small lymphocyte
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A higher kVp produces x-rays with:
A- Greater energy B-Shorter wavelengths C-More penetrating ability D-All of the above |
D-All of the above
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Which of the following is the single most effective method of reducing patient exposure to radiation?
A-Lead apron B-Fast film/digital sensor C-Round PID D-Film-holding devices |
B-Fast film/digital sensor
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Which of the following is the device that restricts the size & shape of the x-ray beam?
A- Filter B-Collimator C-Barrier D-Film Badge |
B-Collimator
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A diagnostic film is produced using 10 mA and .45 seconds. What exposure time is needed to produce the same film at 15 mA?
A-0.25 seconds B-0.30 seconds C- 0.45 seconds D- 0.50 seconds |
B- 0.30 seconds
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Which of the following describes the function of filtration?
A-Increase scatter radiation B-Increases divergent rays C-Increase long wavelengths D- Reduces low-energy waves |
D- Reduces low-energy waves
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The speed of a film is determined by the size of the silver halide crystals. Which statement is correct?
A- The larger the crystals, the faster the film B- The larger the crystals, the smaller the film C- The smaller the crystals, the faster the film D-None of the above |
A- The larger the crystals, the faster the film
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The amount of radiation exposure an individual receives varies depending upon which of the following factors?
A-Film speed B-Collimator C-Technique D- Exposure Factors E-All of the above |
E- All of the above
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Which of the following describes the dose of radiation that the body can endure with little or no chance of injury?
A-ALARA B- Radiation limit C- Maximum permissible dose D-Occupationally exposed dose |
C- Maximum permissible dose
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An instrument used to assist the radiographer with positioning the central ray in relation to tooth and film is:
A- Film holder B-Beam alignment device C- Collimator D- None of the above |
B-Beam alignment device
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The purpose of the lead foil in the film packet is:
A-To protect film primary radiation B- To protect film from saliva C- To protect film from back-scattered radiation D-To distinguish between the patients right and left |
C- To protect film from back-scattered radiation
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Identify the ideal temperature and humidity levels for film storage:
A- 50-70F 30-50% B-60-80F 50-60% C-70-90F 30-50% D- Below 50F 0-30% |
A- 50-70F 30-50%
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Which of the following appears most radiolucent on the radiograph?
A-Bone B-Pulp Chamber C-Dentin D-Air space |
D-Air space
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An example of a radiopaque structure visible on a radiograph is:
A-Bone B-Enamel C-Dentin D-All of the above |
D-All of the above
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The diameter of the xray beam when it contacts the patients face cannot exceed-
A-2.75 inches B-3.25 inches C-3.50 inches D-4.00 inches |
A-2.75 inches
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A variation in the true shape and size of the object being radiographed is termed:
A-Magnification B-Distortion C-Sharpness D-Resolution |
B- Distortion
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The diameter of the x-ray beam when it contacts the patient's face cannot exceed:
A-2.75 inches B-3.25 inches C-3.50 inches D-4.00 inches |
A- 2.75 inches
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A variation in the true size and shape of the object being radiographed is termed:
A- Magnification B- Distortion C-Sharpness D-Resolution |
B- Distortion
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Which of the following describes the relationship of the central ray to the film in the paralleling technique?
A-20 degrees to long axis of tooth B-90 degrees to film and long axis of tooth C-75 degrees to film D-65 degrees to film and long axis |
B-90 degrees to film and long axis of tooth
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Which of the following describes the proper direction of the central ray in the bisecting technique?
A- 90 degrees to the long axis of the tooth B- 90 degrees to the film and long axis C-90 degrees to film D-90 degrees to imaginary bisector |
D-90 degrees to imaginary bisector
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Which of the following is the correct vertical angulation used with a bite wing tab technique?
A- -10 degrees B- -20 degrees C- + 10 degrees D- +15 degrees |
C- +10 degrees
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Which of the following describes primary radiation?
A- Radiation that exits the tube-head B-Radiation that is created when x-rays come in contact with matter C- Radiation that has been deflected from its path by interaction with matter |
A- Radiation that exits the tube-head
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The imaginary line that passes from the bottom of the eye socket thru the top of the ear is termed:
A-Midasgittal plane B- Ala tragus line C- Frankfort plane D- Orbital plane |
C- Frankfort plane
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