Patent ID: 7292034

Claim:
Magnetic resonance (NMR) method for fast, dynamic, spatially resolved measurement of the temporal changes in NMR signals by means of repeated data acquisition in individual measurements (Acq) with measuring sequences which are sensitive to a parameter to be observed, in an NMR apparatus with shim coils which correct the magnetic field, characterized in that during data acquisition of each individual measurement (Acq) in repeated acquisition steps (S 1 . . . S n ) with a time lag, the two- or three-dimensional spatial magnetic field distribution in the NMR apparatus is measured, and that associated technically or physiologically based changes in the magnetic field distribution are determined in a calculation step (S calc ), and compensated by a linear as well as a non-linear dynamic change in the currents in said shim coils, wherein the magnetic field distribution is performed through additionally introduced measurements using two- or three-dimensional sequences (EPI(te 1 ), EPI(te 2 ) having a low spatial resolution and being sensitive to inhomogeneities, wherein at least two sequences EPI(te 1 ), EPI(te 2 ) are carried out at different echo times to determine the local resonance frequencies caused by the field.