The Eye
Input
Output
Parts are Parts
Hodge Podge
100
The ability of the eye to detect differences in the levels of brightness is termed
What is contrast perception?
100
Made of this component
What is cesium iodide?
100
size comparison to input phosphor
What is much smaller?
100
Falling off of sharpness toward the edges of the II tube is called _____________
What is vignetting?
100
Layer of the II tube that emits electrons when stimulated by light photons?
What is the photocathode?
200
Part of the retina that is stimulated by low light
What are the rods?
200
Common diameter
What is 9"?
200
component of output phosphor
What is zinc cadium sulfide?
200
How an II tube is identified?
What is the diameter of the input phosphor?
200
reason why fluoroscopic was developed
What is so that the radiologist could view dynamic images?
300
Part of the retina that is stimulated by bright light
What are the cones?
300
Conversion that occurs
What is exit x-rays from patient to light?
300
Conversion of energy that occurs here
What is electrons to bright image (light photons)?
300
Maintains brightness in the fluoro image when the patient position changes from supine
What is ABC?
300
mA used during fluoro
What is less than or equal to 5 mA?
400
Type of vision that does not perceive color
What is scotopic vision?
400
The input phosphor is the layer as compared to other layers of the II tube
What is first layer?
400
Common diameter of the output phosphor
What is 1"?
400
Draws electrons from photocathode to output phosphor
What is the accelerating anode?
400
The capability of the II to increase the illumination level of the image is called ______________
What is brightness gain?
500
The area of the eye where visual acuity is the greatest
What is the fovea centralis (cones concentrated here)
500
Type of proportion of x-rays to light photons converted
What is a direct proportion?
500
Amount of light produced has increased by ________ times in intensity at the output phosphor.
What is 50-75?
500
Formula for brightness gain
What is MG x FG?
500
Typical level of brightness gain
What is 5,000-30,000?
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