why is a thin protective coating applied to the input screen
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to prevent a chemical interaction with the photocathode
digitization
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permits storage on a computer disk
,how is the magnification factor calculated
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input screen diameter/ diameter of input screen used during mag
Minifcation gain
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Occurs as a result of the same number of electrons that were produced at
the large input screen being compressed into the area of the small output
screen
last image hold
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-common function on most digital fluoro units and the c-arm
-maintains the last real time fluoroscopic image until it is replaced by the
unit being activated again
-allows physicians to work from the most recent image rather than
exposing the pt again
display on a monitor permits changes in
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, -density (digital window level)
-contrast (digital window width)
-magnification
-filtration enhancements
-other techniques
what does the lead lined housing do for the tube
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it absorbs the primary beam while permitting the intensified light photon
image to be transmitted to the viewer
What are the different terms for the various systems that maintain the brightness of the
image by automatically adjusting the exposure factors as necessary according to
subject density and contrast
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-automatic brightness control (ABC)
-automatic dose control (ADC)
-automatic brightness stabilization (ABS)
Total brightness gain
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, A measurement of the increase in image intensity achieved by an image
intensification tube
what are the factors that influence mottle
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-those that affect the number of photons reaching the retina of the eye
-radiation output
-beam attenuation by the subject
-the conversion efficiency of the input screen
-minification gain
-flux gain
-total brightness gain
-viewing system
-the distance of the eye from the viewing system
(increasing the efficiency of any of these factors can assist in reducing
mottle)
What 2 factors determine total brightness gain
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-minification gain
-flux gain
digital fluoro systems are capable of very good separation between ____ and _____,
which produces higher contrast
Give this one a try later!
to prevent a chemical interaction with the photocathode
digitization
Give this one a try later!
permits storage on a computer disk
,how is the magnification factor calculated
Give this one a try later!
input screen diameter/ diameter of input screen used during mag
Minifcation gain
Give this one a try later!
Occurs as a result of the same number of electrons that were produced at
the large input screen being compressed into the area of the small output
screen
last image hold
Give this one a try later!
-common function on most digital fluoro units and the c-arm
-maintains the last real time fluoroscopic image until it is replaced by the
unit being activated again
-allows physicians to work from the most recent image rather than
exposing the pt again
display on a monitor permits changes in
Give this one a try later!
, -density (digital window level)
-contrast (digital window width)
-magnification
-filtration enhancements
-other techniques
what does the lead lined housing do for the tube
Give this one a try later!
it absorbs the primary beam while permitting the intensified light photon
image to be transmitted to the viewer
What are the different terms for the various systems that maintain the brightness of the
image by automatically adjusting the exposure factors as necessary according to
subject density and contrast
Give this one a try later!
-automatic brightness control (ABC)
-automatic dose control (ADC)
-automatic brightness stabilization (ABS)
Total brightness gain
Give this one a try later!
, A measurement of the increase in image intensity achieved by an image
intensification tube
what are the factors that influence mottle
Give this one a try later!
-those that affect the number of photons reaching the retina of the eye
-radiation output
-beam attenuation by the subject
-the conversion efficiency of the input screen
-minification gain
-flux gain
-total brightness gain
-viewing system
-the distance of the eye from the viewing system
(increasing the efficiency of any of these factors can assist in reducing
mottle)
What 2 factors determine total brightness gain
Give this one a try later!
-minification gain
-flux gain
digital fluoro systems are capable of very good separation between ____ and _____,
which produces higher contrast
