fluroscopy chpt 21 Word Scramble

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Question	Answer
Rods are a.more sensitive to light than cones b.less sensitive	a. more sensitive
How is illumination measured?	lumen per square meters or lux
X-ray's and fluro are viewed under what illumination levels?	=100-1000 lux
Rods are a.more sensitive to light than conesb.less sensitive	=a. more sensitive
Structures in the eye used for daylight vision are:a.rods b.cones	=b.cones
Another term for night vision is? a.scotopic b.photopic	=a.scotopic
True or false: Rods are colorblind	=True
Another term for daylight vision is: a.scotopic b.photopic	=b.photopic
Structure better detecting different brightness levels are?	=cones
What is function of image intensifier tube?	=Receives x-ray beam and converts it into visible light image of high intensity.
X-Ray's enter the glass envelope on the image intensifier tube and interact with what first?	=Input phosphor
The input phosphor is made of what material?	=Cesium iodide
Once the xray beam interacts with input phosphor, what occurs next?	=X-ray then converted to visible light.
The photocathode is located where?	=Bonded directly to input phosphor
What is the photocathode made of?=	Cesium and antimony compounds
What is the function of the photocathode?	=Responds to stimulation of input phosphor light by the emission of electrons known as photoemission.
The number of electrons emitted is ________ to the intensity of the light that reaches it.	=Directly proportional.
Electrons produced by photoemission will be accelerated to where?=	To the anode.
What shape is the anode?	=A circular plate with a hole in it.
What is located on the other side of the anode?	=Output phosphor
What is the output phosphor made of?	=Zinc cadmium sulfide.
What is the job of the anode?	=To focus the electrons into a beam.
What is the job of the electrostatic focusing lenses?	=To control the path of the electrons.
What is the function of the output phosphor?	=The site where electrons interact and produce light.
What is the equation for Flux Gain	number of output light photons/number of input x-ray photons.
What is the the equation for Brightness Gain	Minification gain x flux gain
What is the equation for Minification gain	(di/do)2 di-diameter of input phosphor do-diameter of output phosphor
What happens as the diameter of the multified intensifiers is decreased	The image becomes more magnified.
What is the function of the TV camera?	Converts light from output phosphor into an electrical signal and sends to TV monitor.
Function of the glass envelope of TV camera?	maintains vacuum and provide mechanical support for internal components.
The cathode in the TV camera contains what?	The electron gun.
What is the electron gun?	A heated filament that supplies constant electron current by thermionic emission.
What forms the currents from electron gun into an electron beam and helps accelerate them?	Control grid.
The beam from the electron gun is further accelerated and focused by the?	Electrostatic grids
What are the three layers of the target assembly?	1.face plate 2.signal plate 3.target/photoconductive
What is the normal tube current range during fluoroscopy?	1-5ma
The image intensifier improved fluoroscopy by increasing image______?	brightness
Visual acuity int he is greatest at the ________, where ______ are concentrated? a. retinal periphery, cones b.fovea centralis, cones c.retinal periphery, rods d. fovea centralis, rods	b.fovea centralis, cones
The ____ in the retina are stimulated by ______ light: the ___ are stimulated by ________ light. a.rods, bright;cones, low b.rods, low;cones, low c.rods, low;cones, bright d. rods, bright; cones, bright	c.rods, low;cones, bright
X-rays that exit the patient and enter the image intensifier first interact with the a.output phosphor b.input phosphor c.photocathode d.anode	b.input phosphor
The output phosphor of the image intensifier is composed of a.cesium iodide b.antimony c.zinc cadmium sulfide d.graphite	a.cesium iodide
The input phosphor converts ______ to ______ a.xrays, electrons b.light, electrons c.electrons, light d.xrays, light	d.xrays, light
The ________ in the image intensifier emits electrons when it is stimulated by light a.input phosphor b.output phosphor c.photocathode d.electron gun	c.photocathode
The number of light photons emitted within the image intensifier is __________ to the amount of x-ray photons exiting the patient a.equal b.unrelated c.inversely proportional d.directly proportional	d.directly proportional
Electrons hit the ________________ after exiting the anode. a.output phosphor b.tube housing c.photocathode d.focusing lenses	a.output phosphor
The __________________________ is the product of the minification gain and the flux gain. a. horizontal resolution b. brightness gain c. contrast resolution d. flux gain	b.brightness gain
The ratio of x-rays incident on the input phosphor to light photons exiting the output phosphor is called a. magnification gain b. minification gain c. brightness gain d. flux gain	d.flux gain
An image intensifier tube is identified by the diameter of its a. input phosphor. b. glass housing. c. output phosphor. d. focusing lenses.	a.input phosphor
The capability of an image intensifier to increase the illumination level of the image is called its a. flux gain. b. conversion factor. c. brightness gain. d. veiling glare.	c.brightness gain
Viewing the fluoroscopic image in magnification mode increases a. contrast resolution. b. spatial resolution. c. patient dose. d. All of the above.	D.ALL OF THE ABOVE

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