Abstract
Ultra low field magnetic resonance imaging is one of the latest research directions in MRI. Compared with conventional MRI, the size of imaging magnet used could be in mT level or even uT level, which not only reduces the cost and size of the equipment, but also makes it possible to obtain special images that are impossible to get by ordinary MRI equipments. These features provide the ultra low field magnetic resonance imaging technique with very bread application prospects. Recent developments of the technique are reviewed with the focus being put on prepolarized MRI, proton-electron double resonance imaging, laser MRI and superconducting quantum interference device MRI. Key words: Ultra low field; Prepolarized MRI; Proton-electron double resonance imaging; Laser MRI; Superconducting quantum interference device; Magnetic resonance imaging
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