Introduction and principles of interpretation

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Last updated 1:13 AM on 8/20/26
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5 Terms

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What is a radiograph?

A two-dimensional image with many shades of grey created when x-rays pass through a three-dimensional object

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Superimpostion

two structures in different location in 3D, are over top each other on the 2D radiograph

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Distortion

  • Special case of unequal magnification

  • Objects further from the plate will appear larger


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Summation Sign

  • When structures superimpose each other, their opacities are said to “summate” = their opacities add together to appear different than each individual organ

  • Overlapping structures create a summation opacity artifact termed “summation sign”

  • Different opacities may “summate”



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Silhouette Sign

The effacement (loss of visualization) of the border of two structures of the same radiographic opacity that are in contact