Superparamagnetic, ferrimagnetic, or ferromagnetic particles are used as contrast agents in ESR-enhanced MRI. Superparamagnetic particles having an ESR linewidth of less than 20G are preferred. The particles may comprise maghemite (gamma Fe 2 O 3 ), magnetite (Fe 3 O 4 ), or mixtures of such oxides. The particles may also comprise mixed metal oxides such as ferrites, hexagonal ferrites, or garnets. Other compositions are disclosed. The size of the particles may be less than 10 nm. The particles may be coated and suspended in an isotonic suspension.
|IPC||G01R 33/ 28 A I|
|Publication status||Published - 17 Sep 1997|