Chapter 13 Contrast
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Explain the importance of radiographic contrast to image quality
The radiograph must exhibit differences in the brightness levels or densities (image contrast) in order to differentiate among the anatomic tissues
Gray scale is
number of different shades of gray that can be stored and displayed in a digital image or film
Scale of contrast
the range of densities visible on film or digital image
- Long scare
- Low contrast
- Less Contrast
Contrast resolution .
Describes an imaging receptor's ability to distinguish between objects similar in subject contrast
refers to the smallest object that can be imaged.
refers to the distinctness or sharpness of the structural lines that make up the recorded film image.
the faster the film screen speed
decrease in resolution
Brightness is the monitor term for
combination of rows and columns
"picture elements" or smallest component of matrix
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