RADT 1085 Final Exam Questions and Answers All Correct
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RADT 1085
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RADT 1085
RADT 1085 Final Exam Questions and Answers All Correct
When operated in magnification mode, the electrostatic lenses have ________ voltage. - Answer-increased
Digital fluoroscopy with a charge-coupled device has lower _____________ and higher ______________ than conventional fluoroscopy. - A...
RADT 1085 Final Exam Questions
and Answers All Correct
When operated in magnification mode, the electrostatic lenses have ________ voltage.
- Answer-increased
Digital fluoroscopy with a charge-coupled device has lower _____________ and higher
______________ than conventional fluoroscopy. - Answer-patient dose, light sensitivity
The capability of an image intensifier to increase the illumination level of the image is
called its _____________________. - Answer-brightness gain
The ability of the eye to detect differences in brightness levels is termed ___________. -
Answer-contrast perception
The formula for brightness gain is: - Answer-brightness gain = minification gain × flux
gain.
The time-interval delay mode is principally used in ___________ imaging. - Answer-
cardiac
Visual acuity in the eye is greatest at the ___________, where _____ are concentrated.
- Answer-fovea centralis, cones
The conventional or current method for viewing the fluoroscopic image is by: - Answer-
using a TV monitor.
The fiber-optic bundle or optical lens system is used to: - Answer-link the output
phosphor and camera or CCD.
___________ imaging is accomplished with fluoroscopy as opposed to radiography. -
Answer-Dynamic
The image intensifier is capable of resolving about ___________, while the monitor can
resolve about _______________. - Answer-5 Lp/mm; 1 to 2 Lp/mm
Which of the following does not require any additional devices for spot filming during the
fluoroscopic procedure? - Answer-Flat-panel detector in place of image intensifier
With image intensification the light level is raised to ___________ vision. - Answer-
photopic
, A disadvantage of using magnification mode during fluoroscopy is: - Answer-the patient
receives additional dose.
The ____________ in the image intensifier emits electrons when it is stimulated by light
photons. - Answer-photocathode
Viewing the fluoroscopic image in magnification mode increases _____________.
a. contrast resolution
b. spatial resolution
c. patient dose
d. All of the above - Answer-d. All of the above
Each capacitor in a CCD represents a(n): - Answer-pixel.
Fluoroscopy was developed so that radiologists could view ______________ images. -
Answer-dynamic
Distortion of the fluoroscopic image that appears as unequal magnification is - Answer-
pincushion appearance
Which of the following has the possibility of demonstrating veiling glare and pincushion
distortion? - Answer-Conventional image intensifier
The three main parts of the x-ray imaging system are the x-ray tube, _____, and _____.
- Answer-operating console, high voltage generator
The x-ray beam generated by the circuit with the _____ voltage ripple has the _____
quantity and quality. - Answer-lowest, highest
Alternating current is produced by a __ - Answer-generator
Which of the following statements regarding transformers is FALSE? - Answer-Voltage
is increased on the secondary side of a step-down transformer.
n the United States, alternating current goes through a complete cycle every _____
second. - Answer-1/60
Which of the following statements is FALSE? - Answer-Resistance to electron flow
increases as temperature decreases.
The fundamental unit of electric charge is the - Answer-coulomb
Which of the following statements is TRUE? - Answer-All of the above statements are
true.
The negative side of the x-ray tube holds the _____ - Answer-filament
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