FIELD: physics.
SUBSTANCE: invention can be used to analyse an object using a magnetic resonance technique. A magnetic resonance (MR) controller generating a static (B0) magnetic field of 5 T or higher is configured to control an MR scanner to perform an MR sequence (14) including: performing an excitation/localisation sub-sequence (30) on a subject placed in the static (B0) magnetic field generated by the MR scanner to excite 1H polarisation in a selected spatial region of the subject; performing a polarisation transfer sub-sequence (32) to transfer localised 1H polarisation generated by the excitation/localisation sub-sequence to a selected species of non-proton nuclei; and performing a magnetic resonance spectroscopy (MR spectroscopy) readout sub- sequence (40) to acquire MR spectroscopy data for the selected species of non-proton nuclei in the selected spatial region of the subject. The polarisation transfer sub-sequence includes a pair of phase distortion cancelling trapezoidal 180° refocusing pulses (36, 37) operating on the selected species of non-proton nuclei.
EFFECT: reducing distortions when acquiring magnetic resonance spectroscopy data.
15 cl, 4 dwg
