Bu S. Park1, Jun Shen1
1National Institute of Mental Health
(NIMH), National Institute of Health (NIH),
Because of high immunity to RF inhomogeneity and excellent slice profiles, adiabatic pulses are widely used for special localization in MR spectroscopy. Here we propose a scheme for selecting a trapezoidal volume using adiabatic pulses since non-rectangular volume is often preferred in localized spectroscopy. In this scheme, a time-varying gradient orthogonal to a stationary slice-selection gradient is used to change the initial and final boundaries of the slice profile from parallel to non-parallel.