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.