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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| ______ is the degree of geometric sharpness or accuracy of the structural lines actually recorded in the image. | show 🗑
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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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| Most human visual acuity is limited to the range of ____ lp/mm. | show 🗑
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| show | matrix size, pixel size and gray scale bit depth.
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| Digital imaging recorded detail is most commonly described in terms of _________. | show 🗑
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| A shorter wavelength signal (with higher frequency) represents pairs of lines that can be visualized ________. | show 🗑
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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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| The art of radiography involves controlling the degree of _______ so that it does not interfere with image diagnosis. | show 🗑
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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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| _______ is background information that the IR receives. | show 🗑
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| show | Quantum noise
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| Another name for quantum noise is ________. | show 🗑
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| show | Nyquist criterion
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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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| show | fine detail
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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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| show | increases;decreases
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| The minimum OID should be used to improve ______. | show 🗑
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| show | umbra
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| The _____ is the imperfect, unsharp shadow surrounding the umbra. | show 🗑
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| As focal spot decreases in size, ____ also decreases, thus _______ resolution. | show 🗑
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| show | attenuation
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| show | resolution
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| The resolving power of an intensifying screen depends on what three factors? | show 🗑
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| Quantum mottle is corrected only by increasing ______. | show 🗑
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| The major factors that limit photostimulable phosphor systems are the _____ and _____. | show 🗑
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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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| What is the best way to reduce and control voluntary motion? | show 🗑
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| show | involuntary motion
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| show | exposure time
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| show | communication, immobilization devices and reduced exposure time
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| show | matrix size, pixel size, and gray scale bit depth
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| Visualization of _________ is in indication of acceptable resolution | show 🗑
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| The z-axis is the gray scale which is represented as the: | show 🗑
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| High spatial resolution represents a high frequency signal that is capable of imaging | show 🗑
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| Low spatial resolution represents a lower frequency signal that can only image | show 🗑
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| The focal spot size is a major controller of image resolution because it controls | show 🗑
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| High fill factor will produce ______. | show 🗑
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