chapter 25 fluoroscopy
Photoelectric emission - correct answer ✔is the emission of electrons from
an illuminated surface
at what stage of image-intensified fluoroscopy is the number of image-forming
photons lowest? - correct answer ✔entering the input phosphor
image-intensifier brightness gain increases with increasing - correct answer
✔flux gain
when an image intensifier receives x-rays at the input phosphor, what is
emitted at the output phosphor? - correct answer ✔visible light
which of the following is the input phosphor of image intensifiers? - correct
answer ✔cesium iodide
which of the following is the output phosphor of image intensifiers? - correct
answer ✔zinc cadmium sulfide
the photocathode converts - correct answer ✔visible light into electrons
which of the following is the component of the image intensifier responsible for
focusing the electron beam? - correct answer ✔electrostatic lens
the ability of an image intensifier to enhance image illumination is called -
correct answer ✔brightness gain
, the minification gain of an image intensifier increases with increasing - correct
answer ✔input phosphor size
which of the following is a representative brightness gain for an image
intensifier? - correct answer ✔20,000
if an image intensifier is described as a 25/12 tube, 25/12 refers to what? -
correct answer ✔diameter of the input phosphor in centimeters
when a multi focus image intensifier is operated in the magnification mode -
correct answer ✔the electron focal point is closer to the input phosphor
an image that displays vignetting - correct answer ✔is dim around the
periphery
with a multi focus image intensifier in the magnification mode - correct answer
✔spatial resolution is improved
in a 10/7/5 image intensifier - correct answer ✔the field of view is largest in
the 10 mode
an image intensifier has a 5-cm output phosphor and a 45-cm input phosphor.
the brightness gain is 10,000. the flux gain is approximately - correct answer
✔120
place the following in proper sequence for image-intensified fluoroscopy
1. electric signal to light
2. electrons to light
3. light to electric signal
Photoelectric emission - correct answer ✔is the emission of electrons from
an illuminated surface
at what stage of image-intensified fluoroscopy is the number of image-forming
photons lowest? - correct answer ✔entering the input phosphor
image-intensifier brightness gain increases with increasing - correct answer
✔flux gain
when an image intensifier receives x-rays at the input phosphor, what is
emitted at the output phosphor? - correct answer ✔visible light
which of the following is the input phosphor of image intensifiers? - correct
answer ✔cesium iodide
which of the following is the output phosphor of image intensifiers? - correct
answer ✔zinc cadmium sulfide
the photocathode converts - correct answer ✔visible light into electrons
which of the following is the component of the image intensifier responsible for
focusing the electron beam? - correct answer ✔electrostatic lens
the ability of an image intensifier to enhance image illumination is called -
correct answer ✔brightness gain
, the minification gain of an image intensifier increases with increasing - correct
answer ✔input phosphor size
which of the following is a representative brightness gain for an image
intensifier? - correct answer ✔20,000
if an image intensifier is described as a 25/12 tube, 25/12 refers to what? -
correct answer ✔diameter of the input phosphor in centimeters
when a multi focus image intensifier is operated in the magnification mode -
correct answer ✔the electron focal point is closer to the input phosphor
an image that displays vignetting - correct answer ✔is dim around the
periphery
with a multi focus image intensifier in the magnification mode - correct answer
✔spatial resolution is improved
in a 10/7/5 image intensifier - correct answer ✔the field of view is largest in
the 10 mode
an image intensifier has a 5-cm output phosphor and a 45-cm input phosphor.
the brightness gain is 10,000. the flux gain is approximately - correct answer
✔120
place the following in proper sequence for image-intensified fluoroscopy
1. electric signal to light
2. electrons to light
3. light to electric signal
