Abstract
Magnetic resonance imaging (MRI) is a rapidly evolving medical technology which has become widely diffused before comprehensive assessment of its safety, efficacy, cost-effectiveness, and relative cost-effectiveness compared with diagnostic modalities that it seems most likely to replace could be made. In early 1982 there were fewer than ten units worldwide. In August 1984, there were about 150 units and the figure will be closer to 300 by the end of 1985.

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