A nuclear magnetic resonance (NMR) method for spatially resolved
measurement of the distribution of signals of metabolites of different
resonance frequencies by application of a sequence of radio-frequency
pulses and switched magnetic fields, wherein the generated signals are
generated by application of read gradients in a spatially encoded manner
in the direction of these gradients, is characterized in that, after a
time interval TR/2, the initially excited magnetization is subjected to a
sequence of several radio frequency pulses, which are equally spaced by
time intervals TR, and the used magnetic field gradients in each TR
interval are applied such that the originally excited magnetization is
repeatedly refocused in several TR intervals and thereby read out several
times, several signals are generated within one TR interval by multiple
inversion of the read gradient, and the signals which are read-out
several times are each identically spatially encoded by application of
phase encoding gradients and therefore differ only with respect to
dephasing given by the respective resonance frequency, such that the
individual signals at any read-out time can subsequently be associated
with the signal contributions of the examined substances of different
resonance frequencies. This method permits chemical shift selective
measurement of hyperpolarized metabolites.