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fluoro and ancillary

fluoroscopy and ancilllary equipment

QuestionAnswer
The average number of horizontal lines on a T.V. monitor is? 525 1064 128 256 525
The function of an automatic brightness control (automatic exposure control) mechanism of an image intensified fluoroscopic system is to? maintain a fixed dose rate to the image intensifier limit the exposure time prevent excessive x-ray tube heat maintain a fixed dose rate to the image intensifier
The target or photo-conductive layer of the vidicon tube in the television camera, which serves like tiny capacitors, is most often composed of what type of material? cesium iodide lithium oxybromide antimony trisulfide calcium fluoride antimony trisulfide
Fluoro equip made after Aug. 1, 1974, W/O (AEC) shall be operable at any combination of tube potential and current resultant in an exposure rate where the center of the x-ray beam enters the patient in excess of: 1 R/min 5 R/min 10 R/min 2 R/min 5
Which statement about closed circuit T.V. system is true? it produces no signal at all it has all of its circuits on one line it has all of its signals carried through cables it broadcasts through air waves it has all of its circuits on one line
The squared ratio of the input to output screen diameter in an image intensifier tube is termed? Modulation transfer ratio Magnification ratio Conversion ratio Minification ratio magnifucation ratio
The fluoroscopic television operates at a frame rate of? 525 frames/sec 262 1/2 frames/sec 60 frames/sec 30 frames/sec 30
The time it takes for the human eye to adjust to the low light levels of conventional fluoroscopy is called: interlace time integration time adaptation time flicker time adaptation time
The major reason that image intensified fluoroscopy is employed is that it allows for: dynamic viewing real time viewing viewing the transient image All of the abov all
What is the magnetic head gap width in most magnetic tape recorders? 10 mm 100 mm 0.001 mm 0.01 mm 0.001
The most common operator error when using the mobile fluoroscopic C-arm is: using low mA and high kVp placing x-ray tube side of C-arm too close to patient's skin collimating too much placing image intensifier side of C-arm too close to patient's placing x-ray tube side of C-arm too close to patient's skin
A fluoro system is equipped with an ABC mechanism. The x-ray tube is fixed below the x-ray table. If the II is moved away from the patient the effect will be? The PT's dose will be increased The PT's dose will be reduced The image will be reduces the dose will increase
The acceleration of the electron stream inside the image intensifier require a potential difference (voltage) of? 50 kilovolts 25 volts 25 kilovolts 50 volts 25 kilovolts
A 9-inch input phosphor and a 1 inch output phosphor increases the brightness? 9 times 18 times 40 times 81 times 81 (9 squared)
How long does it take for the fluoroscopic table to move from the horizontal to the vertical position? 30-40 sec 5-15 sec 10-20 sec 20-30 sec 20-30 seconds
When compared to conventional radiography, the amount of milliamperage employed for image intensified fluoroscopy is: approximately the same significantly less significantly more None of the above significantlly less
The automatic brightness control (automatic brightness gain) in most fluoroscopic systems serves to maintain image density as: part thickness varies kilovoltage varies distance factors vary all
Which characteristics describes contrast agents used in fluoroscopy? Solid in form High atomic number low atomic number Low toxicity 2 & 4
Which of the following components will result in the greatest image lag? TV electron gun tube plumbicon camera tube orthicon TV camera tube vidicon camera tube vidicon
The point in the image intensifier tube where the electrons crossover is termed the? optical point or spot electronic focal point or spot input focal point or spot output focal point or spot electronic focal point or spot
Which factors result in a brighter image being produced at the output phosphor of an image intensifier? Fluorescent material Tungsten filament cathode Flux gain Minification flux gain and minification
In the optical coupling arrangement, which is nearest the television camera tube? mirror objective lens camera lens beam splitter camera lense
Some of the increase in the light production by an image intensifier results from the acceleration of the electrons across the image intensifier. This is referred to as: conversion gain electronic intensification minification gain Flux gain electronic intensification
The output phosphor of an image intensifier functions to convert _________ into _________ ? light, electrons x-rays, electrons electrons, light light, x-rays output phosphor
The recording head of the video tape receives a changing electric signal which is transformed into a changing: magnetic field video signal current electronic pulse magnetic feild
ost modern image intensifiers use an input fluorescent layer that is composed of? barium lead sulfate cesium iodide zinc cadmium sulfide calcium tungstate cesium iodide
In the optical coupling arrangement, which is nearest the image intensifier? beam splitter objective lens mirror camera lens objective lens
The II input phosphor differs from the output phosphor-the input? is a fixed size, and the output size can vary emits electrons, and the output emits light absorbs electrons, and the output phosphor absorbs light photons is much larger than the out is much larger than the output
What is the most commonly used video disc frame rate? 1 frame/sec 30 frame/sec 15 frame/sec 5 frame/sec 30
In a television picture tube, gas molecules that are ionized during image production are removed by a special device called a/an: ion trap interlaced scanner electron gun control grid ion trap
In the II, electronic intensification occurs when? when the tungsten filament (cathode) is heated and very high potential difference is applied between the cathode and the anode electrons are emitted from the cathode and accelerated toward the anode electrons are emitted from the cathode and accelerated toward the anode
The conversion of light energy into a proportional amount of electrons is accomplished by a/an? photocathode electrostatic lens photomultiplier electron gun photocathode
The electronic signal which carries the information from the television camera to the monitor is termed the? synchronization pulse return beam video signal bandpass video signal
The average number of horizontal lines on a T.V. monitor is? 1064 256 525 128 525
An II fluoro system is switched to the mag mode so the center 6 in of the input screen is now visualized over the entire 9 in input screen. Under ABC with constant kVp (kilovoltage peak), what is the relative increase in exposure rate? 2.25 0.66 1.50 2.25 81/36=2.25
In order to maintain image clarity, the path of the electron flow from the photocathode to the output phosphor is controlled by the: the vacuum glass tube accelerating anode electrostatic lens input phosphor electrostatic lense
What is the operating potential of the image intensifier tube? 25 kV 50 kV 100 kV 75 kV 25kV
The basic provisions regarding mobile fluoroscopy: machines cannot be operated at a skin distance of less 18 in II must be provided conventional fluoro screens are not allowed cant operate the fluoroscope when the collimator or diaphragm is not in pla 2,3,4
A substantial increase in conventional fluoroscopic brightness levels is accomplished in most modern systems using a/an: video tape unit television system image intensifier magnification technique image intinsification
The focusing of the electron stream in the image intensifier tube is accomplished by placing a ________ charge on the electrostatic lens. Positive Negative None of the above positive
In the II, electronic intensification occurs? electrons are moved at high speed from the photocathode to the output phosphor electrons are emitted from the cathode and accelerated toward the anode electrons are emitted from the cathode and accelerated toward the anode
The central portion of the image intensifier tube possesses the greatest? contrast brightness detail resolution resolution
Some of the increase in the light production by an image intensifier results from the acceleration of the electrons across the image intensifier. This is referred to as: Flux gain minification gain conversion gain electronic intensification electronic intensification
In the optical coupling arrangement, which is nearest the image intensifier? camera lens objective lens mirror beam splitter objective lense
In the optical coupling arrangement, which is nearest the television camera tube? objective lens beam splitter mirror camera lens camera lense
Which of the following will send the video signal? target signal plate photomultiplier window signal plate
A technique of 80 kVp is used in fluoroscopy exam. At this kVp, the intensity of the x-ray beam at the table top should not exceed how many Roentgens per minute for each milliampere (mA) of current? 2.2 R/min 10 R/min 1.0 R/min 5.0 R/min 2.2
In the MAG mode, what causes the magnification of the image? increase in distance increase voltage to the electrostatic lens increased kVp increased mA increase voltage to the electrostatic lens
The squared ratio of the input to output screen diameter in an image intensifier tube is termed? Magnification ratio Conversion ratio Minification ratio Modulation transfer ratio minification ratio
Fluoro equipment made after Aug. 1, 1974, "W/o"(AEC) operable @ any combination of tube potential and current which will result in exposure rate @ the point where the center of the beam enters the patient in above: 5 R/min 2 R/min 1 R/min 10 R/min 5
The point in the image intensifier tube where the electrons crossover is termed the? optical point or spot input focal point or spot electronic focal point or spot output focal point or spot electronic focal point or spot
What is the typical setting for milliamperage (mA) during spot filming? 5 mA 10 mA 150 mA 2 mA 150
An image intensified fluoroscopy system is switched to the mag mode so the center 6" of the input screen is now seen over the entire 9" diameter input screen. Under ABC w/ constant kVp, what is the relative increase in exposure rate? 0.66 1.50 zero 2. 81/36 = 2.25
What is the most commonly used video disc frame rate? 15 frame/sec 5 frame/sec 30 frame/sec 1 frame/sec 30
Which of the following components will result in the greatest image lag? TV electron gun tube orthicon TV camera tube plumbicon camera tube vidicon camera tube vidicon
Fluoro equip made after Aug. 1, 1974, "WITH" (AEC)not be operable at any combo of tube potential and current which will result in an exposure rate at the point where the center of the beam enters the patient in excess of: 1 R/min 10 R/min 2 R/min 5 R/ 10
In the optical coupling arrangement, which is nearest the television camera tube? beam splitter mirror objective lens camera lens camera lens
In order to maintain image clarity, the path of the electron flow from the photocathode to the output phosphor is controlled by the: input phosphor electrostatic lens accelerating anode the vacuum glass tube electrostatic lens
The most commonly used television camera tube was the ___________ . plumbicon tube orthicon tube solid state component tubes vidicon tube vidicon
The electron beam in the television camera tube is produced by? thermionic emission photoemission electroemission photoconduction thermonic emission
In digital/computerized fluoroscopy the images produced are initially picked up from the: video camera TV monitor input phosphor output phosphor output phosphor
The recording head of the video tape receives a changing electric signal which is transformed into a changing: electronic pulse video signal current magnetic field magnetic field
The maximum operating potential of most modern fluoroscopic x-ray tubes is approximately: 2 kV 25 kV 150 kV 200 kV 150kV
A photocell located between the image intensifier and the television camera system that is designed to maintain a range of brightness is the: photoemitter automatic brightness stabilizer vidicon None of the above automatic brightness stabilizer
The target or photo-conductive layer of the vidicon tube in the television camera, which serves like tiny capacitors, is most often composed of what type of material? lithium oxybromide antimony trisulfide calcium fluoride cesium iodide antimony trisulfide
The focusing of the electron stream in the image intensifier tube is accomplished by placing a ________ charge on the electrostatic lens. Positive Negative None of the above positive
n the image intensifier, electronic intensification occurs when? electrons are emitted from the cathode and accelerated toward the anode electrons are moved at high speed from the photocathode to the output phosphor electrons are moved at high speed from the photocathode to the output phosphor
The squared ratio of input phosphor to output diameter is called? magnification ratio minification ratio conversion ratio flux gain minification ratio
Which factors result in a brighter image being produced at the output phosphor of an image intensifier? Fluorescent material Tungsten filament cathode Flux gain Minification 3 & 4
The output phosphor of most modern image intensifiers is made of? sodium iodide zinc cadmium sulfide calcuim tungstate cesium iodide zinc cadium sulfide
Most modern image intensifiers use an input fluorescent layer that is composed of? barium lead sulfate calcium tungstate cesium iodide zinc cadmium sulfide cesium iodide
What is the operating potential of the image intensifier tube? 50 kV 100 kV 75 kV 25 kV 25
The conversion of light energy into a proportional amount of electrons is accomplished by a/an? electron gun photomultiplier electrostatic lens photocathode photocathode
The frequency range of the transmitted video signal is called: kell factor horizontal scanning bandpass line rate bandpass
In the television monitor, an electron gun repeats the pattern of the television camera tube's image onto a/an? photographic film fluorescent screen x-ray film photocathode fluorescent screen
The actual focusing of the electron beam in a television camera tube is a accomplished by two sets of: fluoroscent screens monitor chambers coils ion traps coils
The acceleration of the electron stream inside the image intensifier require a potential difference (voltage) of? 25 volts 50 volts 50 kilovolts 25 kilovolts 25 kilovolts
The electronic signal which carries the information from the television camera to the monitor is termed the? bandpass video signal return beam synchronization pulse video signal
n the optical coupling arrangement, which is nearest the image intensifier? camera lens mirror objective lens beam splitter objective lense
The fluoroscopic television operates at a frame rate of? 262 1/2 frames/sec 60 frames/sec 525 frames/sec 30 frames/sec 30
One television frame is equal to? 1 television field 252 1/2 lines 17 milliseconds 2 television field 2 television fields
Created by: amanda.clark
 

 



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