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Physics Ch 5

QuestionAnswer
refers to the sharpness of structural lines recorded in the radiographic image geometric properties
Optimal geometric quality is achieved by maximizing the amount of ________ and minimizing the amount of ________. maximizing recorded detail and minimizing image distortion
refers to the distinctness or sharpness of the structural lines that make up the recorded image recorded detail
What alters the amount of unsharpness recorded in an image? the size of the focal spot, SID, and OID
Focal spot size is determined by: the filament size
What is a typical small focal spot size? 0.5 or 0.6 mm
What is a typical large focal spot size? 1.0 or 1.2 mm
What does focal spot size affect? recorded detail
True or False: The focal spot size affects recorded detail and can change as an z-ray tube ages. True
What relationship does focal spot size have with recorded detail? inverse
When the SID is increased, the amount of image unsharpness is ____. decreased
When the SID is increased, the amount of recorded detail in the image ________. increases
Except for chest and cervical spine radiography, what is the standard SID? 40" or 48" (100cm or 122cm)
SID indicators should be accurate within ___% of the SID. 2%
Optimal recorded detail is achieved when the OID is ______. zero
When the OID is increased, the amount of unsharpness _______. increases
When the OID is increased, the recorded detail ________. decreases
What has the greatest effect on the amount of geometric unsharpness recorded? OID
When increased OID is unavoidable, SID should be ________ slightly to compensate. increased
refers to the smallest detail that can be detected in an image spatial resolution
refers to images of objects that appear longer than the true objects elongation
refers to images that appear shorter than the true objects foreshortening
unsharpness resulting from patient motion blur
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
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
Created by: kkant on 2010-10-05



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