Abstract
This chapter provides an overview of emission tomography (ET), a type of medical imaging technology that uses radioactive materials. The purpose of this chapter is to place highly specialized field of emission tomography within the broader context of imaging science, which has to do with natural vision and its extension into invisible realms by means of a great variety of imaging systems. It also puts ET in the context of human progress towards a better understanding of the physical world. Recent advances in digital computer technology has made it possible to deal with any image as an array of numbers that represents the local values of the object property that has been imaged and to make quantitative measurements of object properties from their images. These methods are employed to deal with the generic issues of imaging science i.e., image-data acquisition, image recovery, recording, distribution, display, observation, analysis, interpretation, evaluation, and optimization.
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