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What are the geometric properties of radiographic image quality?
- Recorded Detail
How does radiographic image detail compare to actual object detail?
All radiographs display less detail than the object being imaged
How is resolution affected by an increase in OID?
How is resolution affected by an increase in SID?
Why does motion reduce recorded detail?
Because it failt to permit enough time for a well defined image to form. The image is spread over a linear distance and appears blurred
What are the two types of distortion?
- Size distortion
- Shape distortion
How is size distortion affected by an increase in SID?
as SID increases Magnification decreases
What is foreshortening and what causes it?
forshortening projects the object so it appears shorter than it really is. It occurs when the part is improperly aligned
What is elongation and what causes it?
Elongation projects the object so it appears to be longer than it really is. It occurs when the tube or the image receptor is improperly aligned
What is proper alignment?
When the CR is perpendicular toboth the anatomical part and the image receptor.
What is the first step in the film critique process?
- Classification of the image
- - is it within acceptance limits
- - optimal or not optimal
When should a film be repeated?
when it is outside acceptance limits
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