RAD 165 Exams 5 & 6 Questions and Correct Answers

1




RAD 165 Exams 5 & 6 Questions and
Correct Answers

Question: Fluoroscopy was developed so that radiologists could view
_____ images.
Answer: dynamic


Question: What is the milliamperage most commonly used during
conventional fluoroscopy?
Answer: < or = 5mA


Question: The II improved fluoroscopy by increasing image
Answer: brightness


Question: Image intensified fluoroscopy is performed at illumination
levels similar to ____.
Answer: radiograph viewing


Question: Visual acuity in the eye is greatest at the ___, where ___ are
concentrated.
Answer: fovea centralis, cones


Question: The ability of the eye to detect differences in brightness levels
is termed ___.
Answer: contrast perception


Question: The ___ in the retina are stimulated by ___ light; the ___ are
stimulated by __ light.
Answer: rods, low; cones, bright




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, 2


Question: With image intensification the light level is raised to ____
vision.
Answer: photopic


Question: X-rays that exit the patient and enter the image intensifier
first interact with the _____.
Answer: input phosphor


Question: The output phosphor of the II is composed of ___.
Answer: zinc cadmium sulfide


Question: The input phosphor converts __ to ___.
Answer: xrays, light


Question: The ____ in the image intensifier emits electrons when it is
stimulated by light photons.
Answer: photocathode


Question: The number of light photons emitted within the image
intensifier is ___ to the amount of x-ray photons exiting the patient
Answer: directly proportional


Question: The kinetic energy of photoelectrons in the image intensifier
is greatly increased by the __.
Answer: potential difference across the tube


Question: Light produced at the output phosphor of the image
intensifier has been increased _____ times in intensity.
Answer: 50-75


Question: Electrons hit the ____ after exiting the anode.
Answer: output phosphor




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