RAD 165 Questions and Correct Answers

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RAD 165 Questions and Correct Answers

Question: The two major principles in creating medical a medical image
are:
a. spatial resolution & noise
b. spatial resolution & contrast resolution
c. contrast resolution & modulation transfer function
d. dynamic range & contrast resolution
Answer: b. spatial resolution & contrast resolution


Question: The human eye can detect _____ different shades of gray.
a. 5
b. 10
c. 20
d. 30
Answer: d. 30


Question: As mAs is increased the signal-to-noise ratio is _____.
a. not affected
b. doubled
c. increased
d. decreased
Answer: c. increased


Question: T or F: Exposures in digital radiography (DR) should not be
repeated due to improper brightness or contrast.
Answer: True


Question: Digital radiography image detail's proper term is ________
__________.


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Answer: spatial resolution


Question: Detective Quantum Efficiency (DQE) in digital radiography is
related to ________ of the x-ray beam.
a. absorption efficiency
b. capture element
c. crystal phophors
d. pixel size
Answer: a. absorption efficiency


Question: Which is the principle advantage of digital imaging over film
screen?
a. increased fog production
b. increased time
c. decreased floor footprint (size)
d. decreased patient dose
Answer: d. decreased patient dose


Question: Which of the following ionizing radiographic equipment has
the best contrast resolution?
a. CT
b. MRI
c. Nuc Med
d. mammo
Answer: a. CT


Question: What is the basic photometric unit?
a. lux
b. nit
c. lumen
d. candela
Answer: c. lumen


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