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Intro to Rad Protection week 3

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Question
Answer
show computed tomography (CT). ultrasound. magnetic resonance imaging. (All of the above.)  
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show radiation detector  
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show atomic number and mass density  
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show pixel values  
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Digital imaging could only be developed after advances were made in   show
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Computed radiography developed in the 1970s with the use of ____ as the image receptor.   show
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Scanned projection radiography was developed as a complement to____.   show
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show direct capture solid-state devices  
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Digital radiography first began to be used in clinical settings in the_____.   show
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show matrix size  
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The number of visible shades of gray in a digital image is determined by___.   show
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The dynamic range determines the degree of___ in the image   show
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_____ requires the largest matrix size.   show
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The typical matrix size for digital radiography is____.   show
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Spatial resolution is determined by the ratio of____to____.   show
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Scanned projection radiography differs from conventional radiography in the lack of   show
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show number of detectors.  
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show long scanning time.  
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Computed radiography utilizes____ for latent image formation.   show
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show computed  
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Detectors acquire info by   show
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show image density  
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show image contrast  
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Resolution is controlled by ____ size.   show
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Detectors currently used in CR include all of the following except   show
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Digital radiography replaces   show
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show Flat panel detectors  
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Which type of system uses a a two-part process to convert incoming x-ray photons to an electronic digital signal   show
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show photodectector  
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show Scintillator  
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A photostimulable imaging plate includes a ___ layer   show
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DR cassettes are also know as   show
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The most common phosper use for computed radiography imaging plates is   show
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show phototimulable fluorohalides  
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show photoeletric interactions  
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show 8 hours  
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show image reader device  
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The CR imaging plate is scanned by a(n)   show
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When the CR imaging plate is scanned the phosphors of the latent image release energy in the form of   show
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During CR imaging plate processing, the laser frees trapped electrons allowing them to return to a lower energy state. This process is known as.   show
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show dynamic  
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What is the milliamperage used during fluoro   show
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The image intensifier improved fluoro by increasing image____.   show
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show photopic  
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X-rays that exit the patient and enter the image intensifier first interact with the   show
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show zinc cadmium sulfide  
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show x-rays, light  
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The ___ in the image intensifier emits electrons when it is stimulated by light photons   show
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The number of light photons emitted withing the image intensifier is ___ to the amount of x-ray photons exiting the patient.   show
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show output phosphor  
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The ___ is the product of the minification gain and the flux gain.   show
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show flux  
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show brightness gain  
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show input phosphor  
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show 5,000 - 30,000  
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Fluoro for an air contrast barium enema is generally done at ___ kV.   show
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Viewing the fluoro image in magnification mode increases   show
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Automatic brightness control(ABC) maintains the brightness of the image by varying   show
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The fluoro x-ray tube and image receptor are mounted on a   show
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The carriage commonly support the   show
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During fluoro, the SOD cannot be less than ___ inches   show
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The photocathode absorbs ___ and emits ____.   show
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show electrons  
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The primary ___ occurs from the acceleration and focusing of the electron beam.   show
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The input screen is ____ in shape.   show
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The shape of the input screen helps to control   show
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The photocathode is composed of ___ metals   show
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Photoemissive materials absorb ____ and emit ___.   show
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The greater the voltage supplied to the electrostatic lenses, the ___ the acceleration and the ___ the focal point to the input screen.   show
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show increase the fluoro tube mA.  
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An electron that is described as being metastable:   show
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Doping of a photostimulable phosphor with Europium results in   show
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show Metastable states are produced  
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Photostimulable phosphor image receptors   show
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To remove the image background radiation or a previous image, one should   show
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The slow-scan portion of the computed radiography reader   show
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Spatial resolution in computed radiography is principally determined by   show
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The source of the stimulating light is:   show
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How does the computed radiography reader maintain the laser beam as a circle   show
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The x-ray capture element of a computed radiography imaging plate is the   show
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show Image contrast  
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Which of the following is an advantage of CR over film/screen.   show
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show Requires computer processing  
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show Is virtually scatter-free  
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The image receptor in CR is   show
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Which of the following is used as a radiation detector in a DR   show
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show 30 frames per second  
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During digital fluoro   show
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show Two  
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Interrogation time:   show
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show postprocessing  
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show Image just preceding contrast  
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A misregistration artifact   show
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Remasking   show
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show Barium Fluorohalide with Europium (Cassette w/ IR)  
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Indirect DR (Digital Radiography)   show
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Indirect DR (Digital Radiography)   show
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Indirect DR (Digital Radiography)   show
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show Involves no scintillating crystals  
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Direct DR   show
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Minification times flux gain equals   show
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