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dig img quiz 1 set2

digital imaging quiz 1 set 2

QuestionAnswer
In the formula for brightness gain, brightness gain equals what? minification gain X flux gain
What is minification gain? ratio of size of the input phosphor to the output phosphor
In the minfication gain formula minification gain equals: square of the diameter of the input phosphor / square of the diameter of the output phosphor
In the conversion factor formula conversion factor equals: output phosphor illumination (cd/m2) / input exposure rate ( mR/s)
Magnification mode results in: better spatial resolution, better contrast resolution, higher pt dose
Explain the relationship between magnification and patient dose increased magnification always increases pt dose
ABC automatic brightness control, automatic dose control or automatic brightness stabilization
What is the purpose of the ABC? to maintain image brightness by adjusting exposure factors for varying part thicknesses
Explain the relationship between FOV and magnification a smaller FOV produces greater magnification
Explain the relationship between magnification and minification gain increasing magnification decreases minification gain which decreases brightness gain
What exposure factor is changed and how to maintain brightness when we change to a larger input phosphor? mA is increased
What is the mA range used in flouro? .5-5mA (avg. 1-3 mA)
What is vignetting part of the image showing decreased brightness at the periphery
What causes vignetting? unfocused remnant radiation interacts with the periphery of the input phosphor
What is the function of television monitoring? to convert the light image into a video signal sent to the monitor
What are the most popular types of television cameras? vidicon and plumicon
How is television monitoring set up? the image intensifier is coupled directly to a television camera tube
What is the difference between lens coupling and fiber optics? fiber optics cannot accommodate aux devices, cannot take spots.
How does lens coupling work? with the use of a beam splitter light is divided between the TV camera and aux devices
What is the function of the objective lens in the beam splitter? accepts light from the output phosphor and converts it into 2 parallel beams
Modulation the size of the video signal is proportional to the light incident on the TV camera tube
Raster pattern movement of the e- beam
Created by: annaluz87