Chap 25 Quiz - Bushong
Fluoroscopy was developed so that radiologists could view _____ images.
a. static
b. dynamic
c. magnified
d. darkened - answerb. dynamic
What is the milliamperage used during fluoroscopy?
a. 100 mA
b. 50 mA
c. 5 mA
d. 1 mA - answer≤5 mA
The image intensifier improved fluoroscopy by increasing image _____.
a. brightness
b. resolution
c. magnification
d. contrast - answera. brightness
Image intensified fluoroscopy is performed at illumination levels similar to _____.
a. star gazing
b. darkened theaters
c. night driving
d. radiographic viewing - answerd. radiographic viewing
Visual acuity in the eye is greatest at the _____, where _____ are concentrated.
a. retinal periphery, cones
b. fovea centralis, cones
c. retinal periphery, rods
d. fovea centralis, rods - answerb. fovea centralis, cones
The ability of the eye to detect differences in brightness levels is termed _____.
a. visual acuity
b. scotopic vision
c. photopic vision
d. contrast perception - answercontrast perception
, The _____ in the retina are stimulated by _____ light; the _____ are stimulated by
_____ light.
a. rods, bright; bones, low
b. rods, low; cones, bright
c. rods, low; cones, bright
d. rods, bright; cones, bright - answerc. rods, low; cones, bright
With image intensification the light level is raised to _____ vision.
a. photopic
b. scotopic
c. night
d. twilight - answera. photopic
X-rays that exit the patient and enter the image intensifier first interact with the _____. -
answerinput phosphor
The output phosphor of the image intensifier is composed of _____.
a. cesium iodide
b. antimony
c. zinc cadmium sulfide
d. graphite - answera. cesium iodide
The input phosphor converts _____ to _____.
a. x-rays, electrons
b. light, electrons
c. electrons, light
d. x-rays, light - answerd. x-rays, light
The _____ in the image intensifier emits electrons when it is stimulated by light photons.
a. input phosphor
b. output phosphor
c. photocathode
d. electron gun - answerc. photocathode
The number of light photons emitted within the image intensifier is _____ to the amount
of x-ray photons exiting the patient.
a. equal
b. unrelated
c. inversely proportional
Fluoroscopy was developed so that radiologists could view _____ images.
a. static
b. dynamic
c. magnified
d. darkened - answerb. dynamic
What is the milliamperage used during fluoroscopy?
a. 100 mA
b. 50 mA
c. 5 mA
d. 1 mA - answer≤5 mA
The image intensifier improved fluoroscopy by increasing image _____.
a. brightness
b. resolution
c. magnification
d. contrast - answera. brightness
Image intensified fluoroscopy is performed at illumination levels similar to _____.
a. star gazing
b. darkened theaters
c. night driving
d. radiographic viewing - answerd. radiographic viewing
Visual acuity in the eye is greatest at the _____, where _____ are concentrated.
a. retinal periphery, cones
b. fovea centralis, cones
c. retinal periphery, rods
d. fovea centralis, rods - answerb. fovea centralis, cones
The ability of the eye to detect differences in brightness levels is termed _____.
a. visual acuity
b. scotopic vision
c. photopic vision
d. contrast perception - answercontrast perception
, The _____ in the retina are stimulated by _____ light; the _____ are stimulated by
_____ light.
a. rods, bright; bones, low
b. rods, low; cones, bright
c. rods, low; cones, bright
d. rods, bright; cones, bright - answerc. rods, low; cones, bright
With image intensification the light level is raised to _____ vision.
a. photopic
b. scotopic
c. night
d. twilight - answera. photopic
X-rays that exit the patient and enter the image intensifier first interact with the _____. -
answerinput phosphor
The output phosphor of the image intensifier is composed of _____.
a. cesium iodide
b. antimony
c. zinc cadmium sulfide
d. graphite - answera. cesium iodide
The input phosphor converts _____ to _____.
a. x-rays, electrons
b. light, electrons
c. electrons, light
d. x-rays, light - answerd. x-rays, light
The _____ in the image intensifier emits electrons when it is stimulated by light photons.
a. input phosphor
b. output phosphor
c. photocathode
d. electron gun - answerc. photocathode
The number of light photons emitted within the image intensifier is _____ to the amount
of x-ray photons exiting the patient.
a. equal
b. unrelated
c. inversely proportional
