Digital fluoroscopy with a charge-couple device has lower ____and higher ____ than conventional fluoroscopy

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IEO Quiz4

Marys Q4 ImgEqS22

Question	Answer
The ratio of incident x-rays on the input phosphor to light photons exiting the output phosphor is called ____gain	Flux
A charge-coupled device used in digital fluoroscopy provides high	Spatial resolution, S/N ratio, DQE
The ___in the retina are stimulated by ___light, the ___are stimulated by ___light	rods, low, cones, bright
Brightness gain is typically in the range of_____	5,000-30,000
Fluoroscopy for an air contrast barium enema is generally done at ____kVp	80-90
Digital fluoroscopic rate is lower than that for continuous analog fluoroscopy-T/F	True
Digital fluoroscopy with a charge-couple device has lower ____and higher ____ than conventional fluoroscopy	patient dose, light sensitivity
What factor increases when the kinetic energy across the image intensifier increases	Voltage
What affect will using a smaller input phosphor have on magnification	increase
What affect will using a smaller input phosphor have on detail	increase
The combination of temporal and energy subtraction techniques is called ____	Hybrid subtraction
The kinetic energy of photoelectrons in the image intensifier is greatly increased by the ____	potential difference across the tube
The output phosphor of the image intensifier is composed of	zinc cadmium sulfide
The time it takes to turn on the digital fluoroscopy x-ray tube and reach selected mA and kVp is the ____time	Interrogation
Fluoroscopy was developed so that radiologists could view ____images	dynamic
Electrons hit the ____after exiting the anode	output phosphor
The ___in the image intensifier emits electrons when it's stimulated by light photons	Photocathode
The ____is the product of minification gain and flux gain	brightness gain
Who invented the fluoroscope	Thomas Edison
With image intensification the light level is raised to____vision	Photopic
x-rays that exit the patient and enter the image intensifier first interact with the ___	input phosphor
Viewing the fluoroscopic image in magnification mode increases___	contrast resolution, spatial resolution, and patient dose
What affect will using magnification have on dose	increase
An image intensifier tube is identified by the diameter of its___	input phosphor
The image intensifier improved fluoroscopy by increasing image____	brightness
What is the milliamperage used during fluoroscopy	5 mA
Automatic brightness control maintains the brightness of the image by varying____	kVp and mA
The input phosphor converts___to ____	x-rays, light
Describe purpose of electrostatic lenses	guides the electrons
Light produced at the output phosphor of the image intensifier has been increased ___times in intensity	50-75
Digital fluoroscopy uses at least ___monitor(s)	2
The capability of an image intensifier to increase the illumination level of the image is called its____	brightness gain
What is the purpose of fluoroscopy	Image in motion

Created by: Levanw

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