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Fluoro. WB Questions

In a modern fluoroscope, the fluoroscopic x-ray tube: can be under or over the table
the fluoroscope was invented by: Thomas Edison
Compared with a radiographic examination, the primary purpose of a flouroscopic examination is to visualize: dynamic images
fluoroscopy normally requires a tube current of: 1 to 5mA
Compared with radiography, the x-ray technique required for fluoroscopy calls for which of the following? lower mA
ABS is designed to compensate for changes in which of the ?following? patient composition
where are rods located in the eye? cornea
which of the following units of measurement is used to express fluoroscopic image brightness? cd/m^2
which of the following structure is most sensitive to color? cones
what is the function of the iris? control the light level
the cones are used for ______ vision photopic
The frovea centralis is part of the.... retina
visual acuity is the ability to do what? perceive fine detail
The rods are used principally for .... dim vision
what is a major difference between fluoro and radiography in terms of technique?. The mA is lower
what is used in fluoro to maintain constant image intensity? ABS (Automatic Brightness Stabilization)
what is responsible for the vision of dim objects? Rod
What ocular structures immediately precedes the vitreous humor along the path of incident light? lens
what is the function of the iris? controls brightness
vertical television resolution is limited principally by which of the following? lines per frame
the electron beam in a television camera tube is produced by? thermionic emission
what is the camera tube most used in television fluoroscopy ? vidicon
what is the photoemissive component of image intensified fluoroscopy? cesium iodine
what is photoconductive?electron gun ,target or signal plate signal plate
what is the principle disadvantage of coupling the television camera to the image intensifier with the use of fiber optics? photospot camera cannot be used
which of the following refers to the image intensifier input phosphor?cesium iodine,electrons from light, or vidicon cesium iodine
what is a critical component in optically coupling an image intensifier with a photospot camera? objective lens
what is the most important component of a television monitor? cathode ray tube
In an optical coupling arrangement what is the nearest to the television camera? camera lens
what is the component of the television monitor in which the video signal is transformed into an image? phosphor screen
what is the electron beam of the television camera tube? modulated
one television frame is equivalent to what? two television fields
fluoroscopic television operates at a frame rate of 30 f/s
horizontal television resolution is limited principally by which of the following?bandpass, field rate, or frame rate bandpass
what is normally the weakest imaging link in television fluoroscopy? television monitor
common frame rates during cinefluorography are 15,30, and 60 f/s because: of the frequency of the power supply
when the electron beam of the cathode ray tube is blanked it is: in a vertical retrace
what is the television camera tube component of image-intensified fluoroscopy? vidicon
What is the emission of electrons from an illuminated surface? photoelectric emission
at what stage of image-intensified fluoroscopy is the number of image forming photons lowest? entering the input phosphor
image-intensifier brightness gain increases with increasing: flux gain
when an image intensifier receives x-rays at the input phosphor, what is emitted at the output phosphor? visible light
which of the following is the input phosphor of image intensifier?cadmium tungstate, cesium iodine, or sodium iodine cesium iodine
what is the output phosphor made of? zinc cadmium sulfide
the photocathode converts: visible light into electrons
what is the component of the image intensifier responsible for focusing the electron beam? electrostatic lens
the ability of an image intensifier to enhance image illumination is called? brightness gain
the minification gain of an image intensifier increases with increasing: input phosphor size
which of the following is a representative brightness gain for an image intensifier? 200, 2,000, or 20,000 20,000
if an image intensifier is described as a 25/12 tube, 25/12 refers to what? diameter of the input phosphor in cm
when a multifocus image intensifier is operated in magnification mode: the electron focal point is closer to the input phosphor
an image that displays vignetting is: dim around the periphery
with a multifocus image intensifier in the magnification mode what is improved? spatial resolution
In a 10/7/5 image intensifier the field of view is largest in the 10 mode
an image intensifier has a 5cm output phosphor and a 45cm input phosphor . The brightness gain is 10,000. flux gain is approximately: 120
what is the proper sequence for image-intensified fluoroscopy? 1- x-ray to light 2- light to electrons 3- electrons to light 4- light to electric signal 5- electric signal to light
which of the following applies to the output phosphor? a- electrons emitted b- light absorbed c- light emitted d- x-rays absorbed e- x-rays emitted C- Light emitted
Created by: rachelreilly