Rad technique digital
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| The two principal characteristics of a medical image are | Spatial resolution and contrast resolution
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| Spatial frequency is used to describe the quality of spatial resolution in terms of | line pairs
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| in digital imaging, spatial resolution is ultimately limited by | pixel size
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| As spatial frequency increases the object size _ and the spatial resolution _ | decreases, increases
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| A _ test tool is used to acquire data for an MTF curve | Bar pattern
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| The use of two screens in imaging results in higher | MTF
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| The number of gray shades that an imaging system can reproduce is called its | dynamic range
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| Screen film radiography has a dynamic range of | 1,000
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| The bit capacity of each pixel identifies the _ of a digital imaging system | dynamic range
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| The _ digital imaging system uses the highest dynamic range. | mammography
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| The portion of useful image forming x-rays is referred to as the | signal
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| As mAs is increased the signal to noise ratio is | increased
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| Image detail is also called | spatial resolution
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| Of all radiography imaging systems, _ has the best contrast resolution | computed tomography
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| With digital imaging, patient dose can be reduced by using higher _ techniques | KVP
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| DQE is _ | detective quantum efficiency
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| If an image receptor has a high probability of interacting with the x-ray beam, then it has a high _ | DQE
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| The use of an image receptor with _ DQE can result in _ patient doses | High, lower
low, and higher
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| The science of _ is the study of the response of the human eye to light | Photometry
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| What is the basic photometric unit? | Lumen
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| The decreasing luminous intensity with increasing distance from the source of light follows_ | the inverse square law
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| T/F A digital display device with higher megapixels has a better spatial resolution | True
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| Almost all medical flat panel digital display devices are _ | Monochrome liquid crystal displays
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| Medical flat panel display devices are identified by the _ | # of pixels
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| The ambient light a digital image workstation should be _ | near darkness
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| Flat-fielding is accomplished through automatic calibration images are called _ and | offset images, and gain images
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| Re-registering an image to correct for patient motion is done with | pixel shift
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| A computation of the mean pixel value within a region-of-interest is performed for _ | quantitative radiology
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| Post-processing includes all of the following except _ | signal interpolation
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| _ is corrected by the application of an offset voltage | Image lag
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| Within PACS network the secretarial workstation and the viewing workstation would be both called | clients
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| Text data and email are generated at a _ workstation in PACS. | RIS
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| Image file size is determined by _ size and gray scale | matrix
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| What is the file size of an image with 1026 x 1026 matrix and 2.5 byte gray scale | 2.6 mb
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| What is the spatial frequency of a digital system that can resolve 100um | 10 lp/mm
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| If a digital system has a spatial resolution of 4 lp/mm, it can resolve an object as small as _ mm | 4
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| If a digital radiography imaging system has a spatial resolution of 10 lp/mm, what is the pixel size of that system? | 0.05 mm
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| If there were such thing as a perfect imaging system, the MTF would be equal to _ | 1
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