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imaging

QuestionAnswer
The kinetic energy of photoelectrons in the image intensifier is greatly increased by the _____________________. potential difference across the tube
Fluoroscopy was developed so that radiologists could view ______________ images dynamic
Light produced at the output phosphor of the image intensifier has been increased __________ times in intensity. 50 to 75
The _______ in the retina are stimulated by _______ light; the _______ are stimulated by _______ light. The rods in the retina are stimulated by low light; the cones are stimulated by bright light.
With image intensification the light level is raised to ___________ vision. photopic
The number of light photons emitted within the image intensifier is ____________ to the amount of x-ray photons exiting the patient. directly proportional
The capability of an image intensifier to increase the illumination level of the image is called its _____________________. brightness gain
Electrons hit the _______________ after exiting the anode. output phosphor
The image intensifier improved fluoroscopy by increasing image _________________. brightness
Visual acuity in the eye is greatest at the ___________, where _____ are concentrated. fovea centralis; cones
Television monitoring allows ________________ to be controlled electronically. both brightness and contrast
Brightness gain is typically in the range of ____________. 5000 to 30,000
Energy subtraction technique takes advantage of the difference in ______________ during contrast injection. K-edge absorption
The combination of temporal and energy subtraction techniques is called _________. hybrid subtraction
Automatic brightness control (ABC) maintains the brightness of the image by varying ___________________. kVp and mA
Created by: nijahmone
 

 



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