FLUOROSCOPY FINAL PAPER
QUESTIONS WITH FULL SOLUTION
GRADED A
◉ Recording head of a video disc recorder uses what to record
images. Answer: laser light and magnetic fields
◉ How does going from 9" to 6" change patient dose. Answer:
Increases patient radiation dose
◉ Radiation absorption by the input phosphor to output phosphor
light gain is called what. Answer: Conversion factor
◉ What are 2 types of fluoro recording systems?. Answer:
Plumbicon and vidicon.
◉ What else can be used to record fluoro studies other than a
videotape?. Answer: Cine film.
◉ What mA range is used to prolong tube life or to prevent tube
failure?. Answer: 0.5 - 5.0 mA.
, ◉ Why is patient dose decreased when SID is decreased in fluoro?.
Answer: Positioning the image intensifier closer to the pt decreases
the SID & pt dose. Pt dose decreases 'cause as the SID is decreased
the # of x-ray photons at the input phosphor increases; this results
in the ABC (automatic brightness control) decreasing the mA to
compensate for the increase in x-ray photons.
◉ The fluoro exposure rate must not exceed ___ Rads per minute or
_____ rads per minute for interventional.. Answer: 10 Rads per
minute or 20 rads per minute for interventional.
◉ What activates the production of x-rays during fluoro?. Answer:
Dead man switch (foot switch); NOT THE "FOOT PEDAL"!
◉ How many light photons are emitted for each absorbed x-ray
photon?. Answer: 5000 light photons.
◉ What percentage of light from an image intesifier's output screen
is transmitted to the cine camera when in use?. Answer: 85 - 95%.
◉ Which type of timer accuracy test is performed for three phase x-
ray units?. Answer: Synchronous spinning top test which shows a
solid arc exposure in portion of a circle and measured in degrees.
QUESTIONS WITH FULL SOLUTION
GRADED A
◉ Recording head of a video disc recorder uses what to record
images. Answer: laser light and magnetic fields
◉ How does going from 9" to 6" change patient dose. Answer:
Increases patient radiation dose
◉ Radiation absorption by the input phosphor to output phosphor
light gain is called what. Answer: Conversion factor
◉ What are 2 types of fluoro recording systems?. Answer:
Plumbicon and vidicon.
◉ What else can be used to record fluoro studies other than a
videotape?. Answer: Cine film.
◉ What mA range is used to prolong tube life or to prevent tube
failure?. Answer: 0.5 - 5.0 mA.
, ◉ Why is patient dose decreased when SID is decreased in fluoro?.
Answer: Positioning the image intensifier closer to the pt decreases
the SID & pt dose. Pt dose decreases 'cause as the SID is decreased
the # of x-ray photons at the input phosphor increases; this results
in the ABC (automatic brightness control) decreasing the mA to
compensate for the increase in x-ray photons.
◉ The fluoro exposure rate must not exceed ___ Rads per minute or
_____ rads per minute for interventional.. Answer: 10 Rads per
minute or 20 rads per minute for interventional.
◉ What activates the production of x-rays during fluoro?. Answer:
Dead man switch (foot switch); NOT THE "FOOT PEDAL"!
◉ How many light photons are emitted for each absorbed x-ray
photon?. Answer: 5000 light photons.
◉ What percentage of light from an image intesifier's output screen
is transmitted to the cine camera when in use?. Answer: 85 - 95%.
◉ Which type of timer accuracy test is performed for three phase x-
ray units?. Answer: Synchronous spinning top test which shows a
solid arc exposure in portion of a circle and measured in degrees.
