Patent ID: 6707299
Filing Date: 2004-03-16
Classification: G01R

Abstract:
A magnetic imaging method for examining substances comprising the steps, through indirect nuclear spinâ€”spin interaction, of creating in an external magnetic field a precession of at least some nuclear spins having an additional phase angle &Dgr;&phgr;=âˆ’&ggr;I&Dgr;BZ&tgr;, wherein &ggr;I is a gyromagnetic constant, &Dgr;BZ is local magnetic field, and &tgr; is the exposure time, relative to an existent precession, so that a transverse magnetization fans out perpendicular to the external magnetic field generating relaxation of the transverse magnetization having relaxation times T2*, and, after the excitation pulse, taking at least one high-resolution image, then applying at least one rephasing pulse that rephases the transversal magnetization, and then taking additional lower resolution images, whereby the high-resolution image and the lower-resolution images are taken during signal relaxation that is determined by spinâ€”spin relaxation time T2.