Abstract
The possible images which may be derived from an object form the set of all mappings of the spatial distribution of one or more of its properties. NMR is a resonant RF absorption and re-emission phenomenon exhibited by magnetic nuclei when subjected to a magnetic field. Exploiting what is probably the last available window into the body NMR imaging uses radiowaves with a wavelength of between 20 and 150 metres to create an entirely new class of image where the usual limitation that the wavelength of the incident radiation shall be less than the smallest feature to be resolved is removed. This is done by taking advantage of what Lauterbur (1) called induced local interactions. He pointed out that the application of a field gradient uniquely localises the resonant interaction at a particular frequency. The resulting NMR signal on frequency analysis gives a graph of proton concentration against distance. By making several radially disposed line projections of proton density and combining these by the well known algorithms used in computed tomography cross-sectional images can be produced.
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Worthington, B.S., Kean, D., Moore, W.S., Hawkes, R.C., Holland, G.N. (1983). The Clinical Potential of NMR Imaging. In: Wende, S., Thelen, M. (eds) Kernspin-Tomographie in der Medizin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69100-3_4
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DOI: https://doi.org/10.1007/978-3-642-69100-3_4
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