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Test Bank (Download Now) For Frommer’s Radiology for the Dental Professional 10th Edition by Stabulas-Savage ISBN: 9780323479332

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Test Bank (Download Now) For Frommer’s Radiology for the Dental Professional 10th Edition by Stabulas-Savage ISBN: 9780323479332

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Chapter 02: The Dental X-Ray Machine
Stabulas-Savage: Frommer’s Radiology for the Dental Professional, 10th Edition
MULTIPLE CHOICE
1. If the useful beam is not centered on the film in the patient’s mouth, the result will be:
a. elongation.
b. overlapping.
c. foreshortening.
d. collimator cutoff.
ANS: D
The useful beam occurs after the primary beam has been filtered and collimated. If the useful
beam is not centered on the film, the result will be collimator cutoff because the collimating
device restricts the size and shape of the x-ray beam. Elongation is caused by inadequate
vertical angulation. Overlapping is the result of the central beam not being perpendicular to
the film and teeth in the horizontal plane. Foreshortening is caused by excessive vertical
angulation.
DIF: Challenging: Application REF: p. 22 OBJ: #13
MSC: CDA: Expose and Evaluate: B1b | CDA: Expose and Evaluate: C1a | CDA: Expose and
Evaluate: C1b
NOT: NBDHE: 2.0 Obtaining and Interpreting Radiographs: 2.3 Technique and 2.4 Recognition of
normalities and abnormalities
2. A diagnostic film is made at 10 mA and 4 impulses. The exposure that would produce the
same image at 5 mA would be:
a. 5 impulses.
b. 8 impulses.
c. 10 impulses.
d. 45 impulses.
ANS: B
10 mA  4 impulses = 40 to produce the same image at 5 mA you would need 8 impulses: 5
mA  8 impulses = 40.
DIF: Challenging: Application REF: p. 20 OBJ: #4 | #10
MSC: CDA: Radiation Safety for Patients and Operators: B1
NOT: NBDHE: 2.0 Obtaining and Interpreting Radiographs: 2.1 Principles of radiophysics and
radiobiology
3. All of the following are on the control panel of the dental x-ray machine EXCEPT one. Which
one is the EXCEPTION?
a. Transformer
b. mA selector
c. Indicator light
d. Exposure button
ANS: A
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Frommer’s Radiology for the Dental Professional 10th Edition Stabulas-Savage Test Bank
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The control panel of the dental x-ray machine contains an on-off switch and indicator light, an
exposure button and indicator light, timer dial and kVp, and mA selectors. It does not contain
a transformer on the panel.
DIF: Easy: Recall REF: p. 17 OBJ: #6
MSC: CDA: Radiation Safety for Patients and Operators: B2 | CDA: Radiation Safety for Patients and
Operators: B3
NOT: NBDHE: 2.0 Obtaining and Interpreting Radiographs: 2.1 Principles of radiophysics and
radiobiology
4. If a radiograph is described as “underpenetrated,” then the error must be:
a. too little mA.
b. excessive mA.
c. too little kVp.
d. excessive kVp.
ANS: C
The quality, or penetrating power of the x-ray beam is controlled by the kilovoltage. Low
kilovoltage, in the 45 to 65 range, produces a diagnostic radiograph that should not be used
because the radiation produced many long, nonpenetrating wavelengths. Excessive kVp
causes overpenetration. The mA range is usually 5 to 15 mA. Milliamperage lower than 5 will
not produce enough x-rays because not enough heat would be available to produce enough
electrons at the cathode of the tube. Excessive mA (mA higher than 15) produces too many
electrons and thus too much heat.
DIF: Challenging: Application REF: p. 20 OBJ: #10
MSC: CDA: Radiation Safety for Patients and Operators: B1
NOT: NBDHE: 2.0 Obtaining and Interpreting Radiographs: 2.1 Principles of radiophysics and
radiobiology
5. Which of the following is used in the high-voltage circuit?
a. A fuse
b. A rectifier
c. A step-up transformer
d. A step-down transformer
ANS: C
The high-voltage circuit in the dental x-ray machine requires voltage in the range of 65,000 to
100,000 V. This increase in voltage is achieved by the use of a step-up transformer. The
filament circuit uses 2 to 5 V, so the 110 V line current is reduced by a step down transformer.
A fuse or rectifier is both not involved in a high-voltage circuit.
DIF: Average: Comprehension REF: p. 17 OBJ: #7
MSC: CDA: Radiation Safety for Patients and Operators: B2
NOT: NBDHE: 2.0 Obtaining and Interpreting Radiographs: 2.1 Principles of radiophysics and
radiobiology
6. Position-indicating device (PID) should be lead-lined to prevent the escape of scatter
radiation. PIDs are always 16-inches long.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true, the second is false.