Ch. 30
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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show | Recorded detail
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show | definition, sharpness, spatial resolution or detail.
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The primary film/screen unit of resolution is ______. | show 🗑
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show | 5
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Digital imaging recorded detail is determined primarily by _____. | show 🗑
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show | spatial frequency
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show | very close together (high resolution)
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Low frequency spatial resolution has a longer wavelength (and lower frequency) representing pairs of lines that are _______. | show 🗑
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show | unsharpness
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show | Spatial resolution
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show | two dimensions
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____________ measure the boundaries of a single image. | show 🗑
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In conventional radiography, PFS was referred to as _________. | show 🗑
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The higher the _________, the closer together the sine waves and the closer together the line pairs. | show 🗑
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_________ measures the accuracy of an image compared to the original object on a scale of 0 to 1. | show 🗑
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show | Imaging noise
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______ refers to a lack of sufficient incoming data (photons) for processing. | show 🗑
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show | quantum mottle
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__________ is the sampling of the spatial resolution frequency signal twice from each cycle in digital systems. | show 🗑
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_______ occurs when the the spatial frequency exceeds the nyquist frequency and the incoming data is sampled less than twice per cycle. | show 🗑
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Resolution affects the image appearance by demonstrating _______ structures. | show 🗑
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______ may cause an unsharpness of an image. | show 🗑
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show | 1. eliminate motion 2. reduce OID 3. reduce focal spot size 4. reduce intensifying screen phosphor size and concentration and 5. increase SID
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show | decreases;increases
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Resolution is improved when SID ______ and degraded when it ______ | show 🗑
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show | detail
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The ______ is the distinctly sharp area of a shadow or the region of complete shadow. | show 🗑
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show | penumbra
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As focal spot decreases in size, ____ also decreases, thus _______ resolution. | show 🗑
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Penumbra is increased by _____ of the beam. | show 🗑
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A slow fim/screen combination will demonstrate better ______ than a fast combination. | show 🗑
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show | phosphor size, phosphor layer thickness and phosphor concentration
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show | mAs
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show | intensifying screen and scanning system
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The major factor that limits INDIRECT digital systems is the ______ | show 🗑
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show | size of the detector element
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_____ is that which is under the direct control of the patient. | show 🗑
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show | communication with the patient
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show | involuntary motion
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Involuntary motion can best reduced by decreasing ________. | show 🗑
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show | communication, immobilization devices and reduced exposure time
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Digital imaging systems are dependent on: | show 🗑
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Visualization of _________ is in indication of acceptable resolution | show 🗑
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show | depth (depth of information)
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show | smaller objects
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show | larger objects
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show | penumbra
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show | high resolution
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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