Rad135 Final Exam Review- Part 5 Question Preview (ID: 56144)
This Content Covers Several Chapters From The Text To Help You Prepare For The Final Exam In Rad135.
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Digitization of the fluoroscopic image permits
a) image postprocessing
b) transfer to PACS
c) electronic archival
d) all of the above
What is the range for milliampere (mA) on a conventional fluoroscopic unit?
a) 0.5-5.0 mA
b) 5.0-10.0 mA
c) 0.1-1.0 mA
d) 1.0-10.0 mA
Which of the following converts light to electrons?
a) electrostatic lenses
b) photocathode
c) focal spot
d) output phosphor
Which of the following are the charged electrodes found on the inside of the glass envelope of the image intensifier?
a) input fluorescent screens
b) magnifying tube
c) output phosphor
d) electrostatic lenses
What is the magnification factor for an image intensifying tube with an input screen diameter of 8 inches and an mag input diameter of 1 inch?
a) 8
b) 64
c) 0.125
d) 0.03=6
Which of the following terms is used to describe a blotchy or grainy appearance produced by a lack of radiation while trying to produce a uniform image?
a) resolution
b) distortion
c) quantum mottle
d) contrast
Which of the following will increase the patient dose during chest fluoroscopy?
a) the II or flat panel detector should be as close to the patient as possible.
b) utilizing magnification mode
c) using pulse mode
d) placing a lead apron under the patient's pelvis.
Which of the following is NOT an advantage of digital over conventional fluoroscopy?
a) last image hold
b) greater distortion of the image
c) not affected by magnetic fields
d) data manipulation
Which of the following is an advantage of a CCD over a TV camera tube?
a) increased noise
b) decreased DQE
c) non-linear response
d) increased spatial resolution
What is the minimum thickness of mm Pb/eq for lead aprons?
a) 0.1 mm Pb/eq
b) 0.2 mm Pb/eq
c) 0.25 mm Pb/eq
d) 0.5 mm Pb/eq
What is the required thickness for bucky slot covers and fluoro curtains in mm Pb/eq?
a) 0.1 mm Pb/eq
b) 0.2 mm Pb/eq
c) 0.25 mm Pb/eq
d) 0.5 mm Pb/eq
What is the minimum SOD for fixed fluoroscopic units?
a) 10 in
b) 15 in
c) 45 in
d) 72 in
On fluoroscopic equipment, federal Law requires a ____ minute timer with an audible and visual alarm.
a) 1 min
b) 2 min
c) 5 min
d) 10 min
What is the maximum fluoro exposure rate at tabletop in R/min?
a) 2
b) 5
c) 8
d) 10
Digital detectors with a higher DQE will ____.
a) require more dose to image adequately
b) produce better images of small objects with low subject contrast
c) produce a lower S:N ratio
d) are not preferred for mammography due to dose
During fluoroscopic image intensification, the primary beam exits the patient and strikes the ___ of the image intensifier.
a) input screen
b) photocathode
c) electrostatic lenses
d) output phosphor
Fluoroscopy is a ___ x-ray examination.
a) dynamic, real time
b) static
c) therapeutic
d) unecessary
In a fluoroscopic system, the x-ray tube and image receptor must be interlocked in order to enable fluoroscopy. This classifies the image receptor as a ____.
a) primary barrier
b) secondary barrier
c) scatter barrier
d) off-focus radiation cause
Total brightness gain is ____.
a) a measure of the increase in image intensity
b) influenced by the minification gain
c) influenced by the flux gain
d) all of the above
Barium is a good contrast agent because of its ____.
a) low Z number
b) high Z number
c) permeability
d) palatability
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