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The great potential of positron emission tomography to elucidate tissue function is reflected in the increasing number of centres being established that offer this technique. Not only does the system offer greater accuracy in the measurement of regional radioactivity concentration than other available techniques, but it also enables the use of true biological tracers. Positron emission tomography is still seen as an expensive tool, principally because of the need for a cyclotron to produce the short-lived isotopes. However, in recent years, much attention has been directed to the development of compact, self-shielding cyclotrons which do not need a team of engineers for their maintenance. In addition, automated kits for the production of commonly used tracers are now available, and in some cases, central cyclotron facilities are being installed to distribute tracers (principally F-labelled compounds) to nearby centres. Parallel innovations in tomographic scanner design continue to blossom, providing more efficient photon detection and improved image resolution. New detector and electronic designs are bringing with them greater reliability'.

Does positron emission tomography contribute to the management of clinical cardiac problems?