FLUOROSCOPY. X-RAYS IN MOTION “Viewing dynamic studies of the human body”. HISTORY. Thomas Edison, 1896 Screen (zinc-cadmium sulfide) placed over patient’s body in x-ray beam Radiologist looked directly at screen Red goggles-30 minutes before exam 1950 image intensifiers developed .
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X-RAYS IN MOTION
“Viewing dynamic studies of the human body”
Used in night vision (scotopic vision)
Dims objects seen better peripherally
Do not perceive detail
Less sensitive to light (threshold of 100 lux)
Will respond to bright light
Daylight vision (phototopic vision)
Perceive color, differences in brightness
Perceive fine detailRODS CONES
# of output light photon
# of input x-ray photons
# of electrons produces at large input screen ( 6 inches) squared, compressed into the area of small output screen ( 1 inch) squared
Try the math
6 inches squared = 36
1 inch squared = 1
Minification gain = 36MINIFICATION GAIN
Why is it easy to convert a conventional fluoro unit to a digital one?