An NMR system performs $i(in vivo) localized NMR spectroscopy. A two-dimensional selective RF excitation pulse is used to localize to a cylindrical region of interest, and either phase encoding or slice selective inversion is used to localize to a disk in the cylindrical region of interest. The two-dimensional selective RF excitation is performed in a series of pulse sequences rather than a single pulse sequence, and the resulting series of acquired NMR signals are summed together to substantially cancel signal contributions from outside the cylindrical region of interest.
METHOD AND APPARATUS FOR LOCALIZED NMR SPECTROSCOPY USING AN INTERLEAVED SPIRAL PATTERN