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Terms in this set (339)

(A) 1 only
Which of the following voltage ripples is (are) produced by single-phase equipment
1. 100% voltage ripple
2. 13% voltage ripple
3. 3.5% voltage ripple
(A) 1 only
(B) 2 only
(C) 2 and 3 only
(D) 1, 2, and 3
(B) line-focus principle
Figure 5-7 illustrates the
(A) inverse-square law
(B) line-focus principle
(C) reciprocity law
(D) anode heel effect
(B) 1 and 2 only
The output phosphor can be coupled with the Vidicon TV camera or charge-coupled device (CCD) via
1. fiber optics.
2. an image distributor or lens.
3. closed-circuit TV.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3
(C) 2 and 3 only

[The typical diode x-ray tube consists of a positive electrode (the anode) and a negative electrode (the cathode). Electrons are released from the cathode's filament, directed toward the anode by the cathode's focusing cup, and delivered at very high speed to the anode's focal track.]
The primary parts of the cathode include the
1. focal track.
2. filament.
3. focusing cup.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3
(C) Scanned projection radiography (SPR)
All of the following are equipment options that may be used to record the anatomical image in mobile radiography, except:
(A) Tethered flat panel
(B) Remote (wireless) digital flat panel array
(C) Scanned projection radiography (SPR)
(D) Conventional radiographic film
(D) 12 cm

[Multifield image intensifier tubes are usually either dual-field or tri-field and are designed this way in order to permit magnification imaging. As voltage is applied to the electrostatic focusing lenses, the focal point moves back—closer to the input phosphor—and a smaller portion of the input phosphor is utilized. As a result, the FOV decreases and magnification increases, producing better spatial resolution. At the same time, brightness is decreased requiring an increase in mA (therefore increased patient dose). This increase in mA increases image quality. It can be likened to an increase in signal-to-noise ratio (SNR), with mA being the signal.]
Using a multifield image intensifier tube, which of the following input phosphor diameters will provide the greatest magnification?
(A) 35 cm
(B) 25 cm
(C) 17 cm
(D) 12 cm
(C) 2 and 3 only
Types of shape distortion include
1. magnification
2. elongation
3. foreshortening
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3
(B) Vidicon
Which of the following is a type of television camera tube that converts a visible image on the output phosphor of the image intensifier into an electronic signal?
(A) Ionization chamber
(B) Vidicon
(C) Charge-coupled device
(D) Cathode ray tube
(B) Photomultiplier tube
A device contained within many CR readers that functions to convert light energy released by the PSP into electrical energy, is called a:
(A) Transilluminator
(B) Photomultiplier tube
(C) Light gate
(D) Penetrometer
(B) Myocytes
Which of the following cells is the least radiosensitive?
(A) Myelocytes
(B) Myocytes
(C) Megakaryocytes
(D) Erythroblasts
(C) 1 and 3 only
Which of the following statements regarding dual x-ray absorptiometry is (are) true?
1. Radiation dose is low.
2. Only low-energy photons are used.
3. Photon attenuation by bone is calculated.
(A) 1 only
(B) 1 and 2 only
(C) 1 and 3 only
(D) 1, 2, and 3
(B) 1 and 2 only
Types of moving grid mechanisms include
1. oscillating.
2. reciprocating.
3. synchronous.
(A) 1 only
(B) 1 and 2 only
(C) 1 and 3 only
(D) 2 and 3 only
(B) X-ray tube not centered to grid
Which of the following errors is illustrated in the figure below?
(A) Patient not centered to IR
(B) X-ray tube not centered to grid
(C) Inaccurate collimation
(D) Unilateral grid cutoff
(B) 1 and 2 only
An increase in kilovoltage will have which of the following effects?
1. More scattered radiation will be produced.
2. The exposure rate will increase.
3. Radiographic contrast will increase.
(A) 1 only
(B) 1 and 2 only
(C) 2 and 3 only
(D) 1, 2, and 3
(C) 2 and 3 only
Which of the following would be appropriate IP 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
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