Shape distortion includes which of the following types?

Shape distortion includes which of the following types?

• A. magnification and minification
• B. magnification, elongation, and foreshortening
• C. elongation and foreshortening
• D. foreshortening and compression

Answer: (C)

Shape distortion occurs when the projection alters the true geometry of a structure. The two forms are elongation and foreshortening. Elongation happens when the part isn’t parallel to the image receptor or the beam is angled so the image appears stretched along its length. Foreshortening occurs when the part is angled toward the receptor (or the beam is angled across the part) so the image looks shorter than the actual anatomy. Magnification and minification affect overall size due to object-to-image-receptor distance, not the shape. Compression isn’t a standard descriptor for shape distortion in radiography. So the distortion related to shape is elongation and foreshortening.

Shape distortion occurs when the projection alters the true geometry of a structure. The two forms are elongation and foreshortening. Elongation happens when the part isn’t parallel to the image receptor or the beam is angled so the image appears stretched along its length. Foreshortening occurs when the part is angled toward the receptor (or the beam is angled across the part) so the image looks shorter than the actual anatomy. Magnification and minification affect overall size due to object-to-image-receptor distance, not the shape. Compression isn’t a standard descriptor for shape distortion in radiography. So the distortion related to shape is elongation and foreshortening.