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RAD107 final review

QuestionAnswer
The _______ in the retina are stimulated by _______ light; the _______ are stimulated by _______ light. rods-low cones-bright
The milliamperage used during fluoroscopy is operated at less than? less than 5 mA
Image intensified fluoroscopy is performed at illumination levels similar to ________. radiograph viewing
The ability of the eye to detect differences in brightness levels is termed ___________. contrast perception
Electrons hit the _______________ after exiting the anode. output phosphor
The ratio of x-rays incident on the input phosphor to light photons exiting the output phosphor is called _______ gain. flux
Light produced at the output phosphor of the image intensifier has been increased __________ times in intensity. 50 to 75
With image intensification the light level is raised to ___________ vision. photopic
The image intensifier improved fluoroscopy by increasing image _________________. brightness
The _______________ is the product of the minification gain and the flux gain. brightness gain
A charge-coupled device used in digital fluoroscopy provides high _________________. spatial resolution, signal to noise ratio, and detective quantum efficiency
Automatic brightness control (ABC) maintains the brightness of the image by varying ___________________. kVp and mA
Energy subtraction technique takes advantage of the difference in ______________ during contrast injection. K-edge absorption
Brightness gain is typically in the range of ____________. 5000 to 30,000
Fluoroscopy for an air contrast barium enema is generally done at _____ kVp. 80-90
The principal drawback of the first-generation CT scanner was the _______________. long scanning time
Many CT x-ray tubes have the capacity for millions of _________ with each exam. heat units
CT scanners operate on ________________ voltage generation. high-frequency
Each CT projection records variations in _________________________. mass density and effective atomic number
The time from the end of CT imaging to image appearance is called the ______ time. reconstruction
The concentration of scintillation detectors affects the ___________ of the CT image. spatial resolution
The second-generation CT scanners had the disadvantage of increased ____________. beam scatter
Each pixel of information in the CT image contains numerical information in ___________ units. Hounsfield
Each CT projection is ______________________. stored on the computer
The relationship between patient couch movement and the x-ray beam is known as ______________. pitch
CT imaging has excellent ______________ because of the narrow beam collimation. contrast resolution
A CT image is a ___________ or __________ image that is perpendicular to the long axis of the body. transaxial, transverse
The x-ray source and the detector move ______________ for computed tomography. synchronously
The CT scanner must be calibrated so that ____________ is at CT number zero. water
A high variation in pixel values in a homogeneous phantom is a measure of ________. image noise
The power rating for an interventional radiography tube should be at least _____ kW. 100
The x-ray tube used for interventional radiologic procedures has a _____________. small target angle
The use of ______________ reduces the risk of a drug reaction during angiographic procedures. nonionic contrast
The first digital radiographic tomosynthesis (DRT) appeared in which modality? mammography
An advantage of DRT is to _______________. reduce or eliminate tissue superimposition
What is the typical source to center of rotation distance in DRT? 60-100cm
During digital radiographic tomosynthesis (DRT), what is the range of the sweep of the x-ray tube? +/– 5 to +/– 25 degrees
Created by: travis686
 

 



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