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The image amplifier allows one to do fluoroscopy in a lighted room, thereby allowing one to use cone vision rather than rod vision. This does away with the prolonged period of time, 15 to 30 minutes, it takes to secure full rod vision to see clearly detail in the present Patterson 2 B type of fluoroscopic screen. In theory the Fluorex image amplifier is an electronic vacuum tube and works as follows (fig. 1): X-rays, when they are generated by the x-ray tube, pass through the patient and then, in the ordinary fluoroscope, hinge upon the fluoroscopic screen. With the image amplifier, these rays, as they emerge from the patient, are collected on a 5 in. fluorescent screen located just within the inner surface of the glass vacuum image amplifier tube. In close contact with the fluorescent screen is a photoelectric surface. Light produced on the screen by the x-rays
Zimmerman HA. USE OF THE IMAGE AMPLIFIER IN CARDIOVASCULAR DIAGNOSIS. JAMA. 1955;159(15):1449–1451. doi:10.1001/jama.1955.02960320025008a
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