Physics Fluoroscopy Exam Questions
and Answers All Correct
What is the weakest link to the image intensifier? - Answer- TV camera tube
The parts on the input side of the intensifier? - Answer- Input phosphor and
photocathode
What does the input phosphor do? - Answer- Converts photons into light
What does the photocathode do? - Answer- Converts light into electrons
What is input phosphor COMMONLY made of? - Answer- Cesium-Iodide
but can be made with zinc-camnium as well
What is adjacent to the input phosphor? - Answer- Photocathode
Explain the cycle of the intensifying tube - Answer- Comes through the input phosphors
where the x-ray photons are converted into light, then goes through the photocathode
where the light is converted into electrons, then it hits the the electrostatic lens which is
a negative charge and it pushes up to the anode, where the output phosphors converts
the electrons back to light.
What are TV camera tubes? - Answer- Vidicon and Plumbicon
What is the purpose of the vidicon and plumbicon - Answer- it converts light photons
into video
Where are the TV cameras located? - Answer- Attached to the output phosphor
Electrostatic Lenses - Answer- are a series of charged electrodes located inside the
glass envelope of the tube. Because the electrons are negative, the charge of the
lenses accelerates and focuses the electron stream, which carries the fluoroscopic
image.
Automatic Brightness Gain - Answer- Automatically focuses (fixes) itself when it has
different densities
How does it automatically fix itself? - Answer- increases the mAs and the KV
Another phrase for voltage - Answer- Potential difference
and Answers All Correct
What is the weakest link to the image intensifier? - Answer- TV camera tube
The parts on the input side of the intensifier? - Answer- Input phosphor and
photocathode
What does the input phosphor do? - Answer- Converts photons into light
What does the photocathode do? - Answer- Converts light into electrons
What is input phosphor COMMONLY made of? - Answer- Cesium-Iodide
but can be made with zinc-camnium as well
What is adjacent to the input phosphor? - Answer- Photocathode
Explain the cycle of the intensifying tube - Answer- Comes through the input phosphors
where the x-ray photons are converted into light, then goes through the photocathode
where the light is converted into electrons, then it hits the the electrostatic lens which is
a negative charge and it pushes up to the anode, where the output phosphors converts
the electrons back to light.
What are TV camera tubes? - Answer- Vidicon and Plumbicon
What is the purpose of the vidicon and plumbicon - Answer- it converts light photons
into video
Where are the TV cameras located? - Answer- Attached to the output phosphor
Electrostatic Lenses - Answer- are a series of charged electrodes located inside the
glass envelope of the tube. Because the electrons are negative, the charge of the
lenses accelerates and focuses the electron stream, which carries the fluoroscopic
image.
Automatic Brightness Gain - Answer- Automatically focuses (fixes) itself when it has
different densities
How does it automatically fix itself? - Answer- increases the mAs and the KV
Another phrase for voltage - Answer- Potential difference
