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Digital Flouroscopy

Digital Radiography: An introduction Chapter 6

QuestionAnswer
Who developed the first fluoroscope and when? Thomas Edison 1896
What is conventional fluoroscopy? Dynamic real-time imaging
What are the two types of fluoroscopic equipment? mobile and stationary
What is the typical range of mA used in fluoroscopy? .5-5
What is the minimum SSD in mobile fluoroscopy imaging? 12"
What is the minimum SSD in fixed fluoroscopy imaging? 15"
What are the three technologies of fluoroscopy? Direct viewing, Intensifier, Flat Panel
The overall goal of _____ ___________ is to reduce patient dose. pulsed fluoroscopy
_____ _________ refers to the brightening of the fluoroscopic image using the image intensifier. Image Intensification
In an image intensifier tube, the ______ _____ is coated with a phosphor that converts x-ray photons to light photons. input screen
The input screen diameter usually falls within the range of __-__ cm. 13-30
The light from the input screen strikes the ________. photocathode
The photocathode is made of ______ _____. antimony cesium
The light from the input screen strikes the photocathode and emits ________. photoelectrons
The __________ _____ consists of a series of electrodes that accelerate and focus the photoelectrons from the photocathode to the output screen. electrostatic lenses
The output screen is coated with a _____ phosphor. ZnCdS
The _____ ____ converts the photoelectrons into light. output screen
The diameter of the output screen is about __/__ the diameter of the input screen 1/10
Brightness gain= Minification gain x flux gain
Minification Gain= Diameter of the input screen/diameter of the output screen
Flux gain= number of light photons at the output screen/number of light photons at the input screen
Magnification provides ______ spatial resolution but at the expense of ______ dose to the patient increased
The ____ ____ of an image intensifier tube is the ratio of the image brightness at the periphery to that at the center of the output screen. contrast ratio
________ refers to a loss of brightness at the periphery of the image Vignetting
______ _____ is an artifact that results when light is scattered in the intensifier tube. Veiling glare
The ______ the number of bits, the more accurate is the ADC. higher
When you magnify, an image the focal point goes toward the _____ _____. input screen
The ____ is a small ring of metal that provides a strong force toward the output phosphor. anode
Created by: frenchfrielover
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