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EQUIPMENT & MAINTENANCE - RADIOLOGY EXAM REVIEW [ARRT] - [APPELTON & LANGE REVIEW]
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EQUIPMENT & MAINTENANCE - RADIOLOGY EXAM REVIEW [ARRT] - [APPELTON & LANGE REVIEW]
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EQUIPMENT & MAINTENANCE - RADIOLOGY EXAMREVIEW [ARRT] - [APPELTON & LANGE REVIEW]
1) The advantages of large-format spot film cameras, such as 100-mm and 105-mm, over
smaller-format cameras, such as 70-mm and 90-mm, include
1. improved image quality.
2. decreased patient dose.
3. decreased x-ray tube heat load.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3 - (ANSWER)(A) 1 only
2) Exposures less than the minimum response time of an AEC may be required when
1. using high mA.
2. using fast film / screen combinations.
3. examining large patients or body parts.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3 - (ANSWER)(B) 1 and 2 only
3) The function of a plumbicon and vidicon is to convert:
(A) x-ray photon energy to visible light energy
(B) light energy to x-ray photon energy
(C) light to an electrical signal that is sent to the TV monitor
(D) an electrical signal to a light signal that is sent to the TV monitor - (ANSWER)(C) light to an
electrical signal that is sent to the TV monitor
,4) Which of the following would be appropriate cassette front material(s)?
1. Tungsten
2. Magnesium
3. Bakelite
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3 - (ANSWER)(C) 2 and 3 only
5) Tungsten alloy is the usual choice for the anode target material of radiographic equipment
because it
1. has a high atomic number.
2. has a high melting point.
3. can readily dissipate heat.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3 - (ANSWER)(D) 1, 2, and 3
6) If an AP hip technique required 92 kVp with single-phase x-ray equipment, what kVp would
produce a comparable image with three-phase equipment?
(A) 69
(B) 75
(C) 81
(D) 103 - (ANSWER)(C) 81
(With three-phase equipment, voltage never drops to zero, and x-ray emission is 12 percent
greater. Therefore, if 92 kVp is used with single-phase equipment, 81 kVp (12 percent less) will
be required with three-phase equipment.)
7) The rear intensifying screen within a cassette may intentionally be made somewhat thicker to
,(A) compensate for photon absorption within the front screen.
(B) improve the resolution capability of the screens.
(C) reduce the amount of light reflectance.
(D) minimize crossover. - (ANSWER)(A) compensate for photon absorption within the front
screen.
8) As the x-ray tube filament ages, it becomes progressively thinner because of evaporation. The
vaporized tungsten is frequently deposited on the window of the glass envelope. This may
1. act as an additional filter.
2. reduce tube output.
3. result in arcing and tube puncture.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3 - (ANSWER)(D) 1, 2, and 3
9) Several types of exposure timers may be found on x-ray equipment. Which of the following
types of timers functions to accurately duplicate radiographic densities?
(A) Synchronous
(B) Impulse
(C) Electronic
(D) Phototimer - (ANSWER)(D) Phototimer
10) In which of the following portions of the x-ray circuit is a step-down transformer located?
(A) High-voltage side
(B) Filament circuit
(C) Rectification system
(D) Secondary side - (ANSWER)(B) Filament circuit
, 11) Which of the following functions to increase the mA?
(A) increase in charge of anode
(B) increase in heat of the filament
(C) increase in kVp
(D) increase in focal spot size - (ANSWER)(B) increase in heat of the filament
12) In order to maintain image clarity in an image intensifier system, the path of electron flow
from the photocathode to the output phosphor is controlled by
(A) the accelerating anode.
(B) electrostatic lenses.
(C) the vacuum glass envelope.
(D) the input phosphor. - (ANSWER)(B) electrostatic lenses.
13) Radiographs from a particular single-phase, full-wave-rectified x-ray unit were overexposed,
using known correct exposures. A spinning top test was performed at 200 mA, 0.05 s, and 70
kVp, and eight dots (dashes) were visualized on the finished film. Which of the following is
indicated?
(A) The 0.05-s time station is inaccurate.
(B) The 200-mA station is inaccurate.
(C) A rectifier is not functioning.
(D) The processor needs servicing. - (ANSWER)(A) The 0.05-s time station is inaccurate.
(The spinning top test is used to test timer accuracy or rectifier operation. Because single-phase,
full-wave-rectified current has 120 useful impulses per second, a 1-s exposure of the spinning
top should demonstrate 120 dots. Therefore, a 0.05-s exposure should demonstrate six dots.
Anything more or less than that indicates that the time station needs calibration. If exactly one-
half of the expected number of dots appears, one should suspect rectifier failure)
14) The essential function of the photomultiplier is to
(A) provide a brighter fluoroscopic image.
(B) automatically restrict the field size.
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