In recent years the computerized postprocessing of image data from cross-sectional imaging modalities has received progressively increasing recognition in the field of medicine. This development has various reasons. Firstly, the technical developments of examination modalities such as CT and MRI, as well as SPECT, PET, and ultrasound, have swiftly improved along with continuously increasing spatial resolution, which means not only a growing memory capacity for the computer, but also that additional image information is included in each slice. For any given volume, more slices can be produced in an ever-decreasing amount of time. Secondly, rapidly growing computer performance has created the opportunity to display complex relations, be it anatomical structures or functional information, in a simplified and comprehensible manner.
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