Sharpness is considered a major factor in determining image quality as it is the factor that determines the amount of detail an imaging system can reproduce (Figure 11).
Sharpness is defined by the dimensions of the partially shaded outer region or the penumbra of an object. The wider the penumbra, the less sharp the image (Figure 12).1,2,5
We will only discuss the properties of shadow-casting and the width of the penumbra that are related to the x-ray tube and sensor. We will not factor in patient-related sharpness of the image.
The sharpness of the image depends on multiple factors. We will consider one variable at a time, keeping the other variables fixed:
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