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Fast Localized Calibration for Spatial-Spectral Excitation Without Fly-Back Gradients
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DOI：10.1002/mrm.70508.png)
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Abstract
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Standard spatial-spectral excitation pulses apply a fly-back gradient between sub-pulses, limiting, for example, how thin the slices can be (> 4 mm). Without fly-back gradients, slices can be as thin as 1.7 mm but require a phase calibration for the sub-pulses with inverted gradients due to system imperfections. Here we propose and test a fast (< 1 s), localized pre-scan enabling thin-slice frequency-selective excitation.
Keywords:
coronary angiography
fat suppression
localized calibration
magnetic resonance imaging
RF pulse design
spectral-spatial excitation
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