When referring to image quality, resolution

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Resolution refers to how well objects can be separated in space (as opposed to blurring them together); contrast refers to how well different levels of brightness can be seen (brightness represents density for radiographs, and radionuclide concentration in scintigrams); and noise refers to random additions to the image that interfere with the viewer's perception.In a scintigraphic image, resolution allows separation of two objects that are close together.Contrast allows the determination of whether two objects have different activity concentrations.Noise is primarily due to counting statistics.Contrast in scintigraphic images can be defined as the measure of counts (or intensity) in the target (the object being imaged) compared with the intensity in a background region.

When Referring to Image Quality, Resolution