Distortion
1) T or F: In all instances reduced magnification increases the resolution of recorded detail.
2) _________ is a misrepresentation in size or shape of the part being imaged.
3) What are the two influencing factors in size distortion?
4) Size distortion can be calculated with the formula M=SID/SOD. What percentage change would there be with an SID of 72 inches and an OID of 6 inches?
5) After you have the magnification factor and the image size you can figure the actual object size using O=I/M. If an image measured 10” and had the magnification factor of the problem above what would be the actual object size?
6) Changes in the tube angle cause what type of shape distortion?
7) T or F: Improper tube centering has no effect on shape distortion.
Answers
1) True
2) Distortion
3) SID, OID
4) 9% or 1.09 increase
5) 9.17”
6) Elongation
7) False, tube centering plays a huge roll in how the body part is represented
