Spectral editing with adiabatic pulses
Abstract
Amplitude- and frequency-modulated pulses, known as adiabatic pulses, can induce uniform flip angles in the presence of extreme B1 inhomogeneity, which makes them advantageous for in vivo surface-coil studies. This paper describes the conversion of conventional (square pulse-based) spectral-editing sequences into their adiabatic counterparts. Eight adiabatic homo- and heteronuclear sequences are experimentally evaluated for lactate editing. For homonuclear lactate editing, gradient-enhanced multiple-quantum-coherence filtering provides the best overall performance (100% signal recovery with excellent water and lipid suppression in a single acquisition). For heteronuclear [3-(13)C]lactate editing, gradient-enhanced heteronuclear multiple-quantum-coherence filtering provides the best suppression of unwanted signals in a single acquisition, whereas J-modulated spin-echo sequences yield maximum sensitivity.
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