To reduce the noise level in NMR / MRI experiment , gradient magnetic field generating system and method

摘要

The present invention concerns a magnetic field gradient generating system for a NMR system, comprising at least one set of gradient coils, preferably arranged according to the three axes X, Y, Z of a spatial referential system, and controlled power supplying means for said gradient coils, said power supplying means comprising, for each gradient coil, a converter/amplifier module, said modules being fed with pulse sequences of digital gradient data provided as word streams by an adapted gradient data generator according to a pulse program, each arrangement of a gradient coil and a converter/amplifier module forming a gradient channel. Gradient generating system (1) characterised in that said controlled power supplying means (3) also comprise an automatic blanking system (8) which scans the gradient data words sent to the [converter (4)/amplifier (5)] modules (6) and, according to the sensed values, selectively delivers blanking signals to be applied to said modules (6) in order to disable the power stages of their respective amplifiers (5) connected to the gradient coils (2), when no current is to be fed to said coils (2).