Distortion (Chapter 29)

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23 Terms

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Distortion

The misrepresentation of the size or shape of the structures being examined

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2 types of distortion are?

  1. Size distortion

  2. Shape distortion

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What is an example of size distortion?

Magnification

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Magnification reduced _____

Recorded detail

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What are factors affecting size distortion?

OID and SID

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The greater the SID, the ____ the magnification

Less

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The greater the OID, the _____ the magnification

More

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Magnification or size distortion can be calculated by using the

Magnification Factor

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Magnification Factor=

SID/ SOD

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Object Size=

Image size/ magnification factor

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% magnification of the object=

IS-OS/OS x 100

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What is shape distortion?

An unequal magnification of the object

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Two types of shape distortion?

Elongation and foreshortening

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What affects shape distortion?

Tube/part/film alignment

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What are the factors affecting shape distortion?

Angulation and alignment

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Central ray: beam divergence is _____ at edges of beam due to angle of beam

Greater

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Anatomical part: part aligned correctly to ______

Central ray

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Image receptor: should lie flat, not _____ or ______ to beam

Angled to part, perpendicular

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What is elongation caused by?

Misalignment of the CR and the IR

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The greater the angle the ____ the elongation

Greater

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Foreshortening is when?

Object appears to be shorter than it really is

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Tube or IRS angle will cause elongation, never ______

Foreshortening

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What are the ways to minimize distortion?

  1. Use small OID

  2. Use large SID

  3. Insure proper tube/part/film alignment