Image resolution is the details that an image can contain. The details depend on the following factors:
Contrast Resolution
It is the ability of an imaging system to distinguish between multiple densities in the radiographic image. In the case of digital imaging, it depends on the bit-depth of the system. As noted earlier, an 8-bit system can show only 256 gray values as opposed to a 12-bit system, which shows 4096 gray values. The 8-bit system shows less gray values and is a high contrast system than the 12-bit system that shows more gray values and is a low contrast system. However, if the 12-bit-system can clearly show two near-by gray value intensities, the system will have a high contrast resolution (Figure 6).1,3,6,7
Spatial Resolution
Spatial resolution in radiology refers to the ability of an imaging system to differentiate between two near-by objects. In digital imaging, it depends on the size of the pixel used. A large pixel size will be unable to resolve two near-by structures as compared to a small pixel size. Spatial resolution is measured in line-pairs per millimeters (Figure 7).1,4,7,9-11
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