imaging system

Advances in techniques for obtaining images of the body’s interior have greatly improved medical diagnosis. New imaging methods include various X-ray systems, positron emission tomography, and nuclear magnetic resonance imaging.

The object, then, to be imaged by the optical system consists of a spatial distribution of intensity of a single spatial frequency—an object the intensity of which varies as (1 + a cos ωx), in which x is the spatial coordinate, a is a constant called the contrast, and ω…