Clin. magnetic resonance imaging (MRI) is characterized by the use of large, expensive whole-body magnets.In recent years the need for these large magnets has been challenged by the evolution of compact and targetted magnet systems.The compact whole-body magnet is epitomized by the Phillips T5 system.This system is easy to site, magnetically shielded and short enough to minimize claustrophobic effects.The targetted approach has been pursued by Otsuka with a 1.5 T small bore clin. system.This system has been designed to image heads, spines and knees: ∼90% of the work load of a conventional whole-body system.To maintain good patient access in this small magnet system, Otsuka have developed a range of local magnetic field gradients and radiofrequency (rf) coils.The ultimate compact imaging system is a 0.5T research magnet sited at Exeter University.This magnet is ∼1/6 the size of a typical whole-body magnet and was originally intended for imaging the knee but has also produced some high-quality images of the head.