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. TEACHERS: click here for quick copy question ID numbers.

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

Fluoroscopy is a ___ x-ray examination.
a) dynamic, real time
b) static
c) therapeutic
d) unecessary

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

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

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

What is the minimum SOD for fixed fluoroscopic units?
a) 10 in
b) 15 in
c) 45 in
d) 72 in

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

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

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 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 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

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 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 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

Digitization of the fluoroscopic image permits
a) image postprocessing
b) transfer to PACS
c) electronic archival
d) all of the above

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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