21 Imaging systems
A variety of imaging systems that are not film based are used for a range of applications in science, technology, industry and medicine (Moores, 1981). While strictly not ‘photographic’ they can use optical systems, have a specific spectral coverage and store images as digital data for subsequent processing, enhancement and analysis. The hard copy output may be on to a silver halide material. The image may result from intensive digital signal processing from a multiplicity of data. Representative systems include thermal imaging, nuclear medicine, computerized tomography, positron emission tomography, magnetic resonance imaging and ultrasound imaging. A comparison of features are given in Table 21.1. Detailed descriptions of ...
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