Physics Ch 5
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each of the black spaces below before clicking
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| refers to the sharpness of structural lines recorded in the radiographic image | geometric properties
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| Optimal geometric quality is achieved by maximizing the amount of ________ and minimizing the amount of ________. | maximizing recorded detail and minimizing image distortion
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| refers to the distinctness or sharpness of the structural lines that make up the recorded image | recorded detail
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| What alters the amount of unsharpness recorded in an image? | the size of the focal spot, SID, and OID
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| Focal spot size is determined by: | the filament size
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| What is a typical small focal spot size? | 0.5 or 0.6 mm
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| What is a typical large focal spot size? | 1.0 or 1.2 mm
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| What does focal spot size affect? | recorded detail
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| True or False: The focal spot size affects recorded detail and can change as an z-ray tube ages. | True
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| What relationship does focal spot size have with recorded detail? | inverse
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| When the SID is increased, the amount of image unsharpness is ____. | decreased
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| When the SID is increased, the amount of recorded detail in the image ________. | increases
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| Except for chest and cervical spine radiography, what is the standard SID? | 40" or 48" (100cm or 122cm)
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| SID indicators should be accurate within ___% of the SID. | 2%
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| Optimal recorded detail is achieved when the OID is ______. | zero
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| When the OID is increased, the amount of unsharpness _______. | increases
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| When the OID is increased, the recorded detail ________. | decreases
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| What has the greatest effect on the amount of geometric unsharpness recorded? | OID
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| When increased OID is unavoidable, SID should be ________ slightly to compensate. | increased
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| refers to the smallest detail that can be detected in an image | spatial resolution
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| refers to images of objects that appear longer than the true objects | elongation
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| refers to images that appear shorter than the true objects | foreshortening
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| unsharpness resulting from patient motion | blur
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| Why can't a radiographic image be an exact reconstruction of the anatomic structure? | Because some information is always lost during the process of image formation
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| Why can't a radiographic image be an exact reconstruction of the anatomic structure? | Because some information is always lost during the process of image formation
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