Sparsity in MRI RF excitation pulse design

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Sparsity in MRI RF excitation pulse design
—Magnetic resonance imaging (MRI) may be viewed as a two-stage experiment that yields a non-invasive spatial mapping of hydrogen nuclei in living subjects. Nuclear spins within a subject are first excited using a radio-frequency (RF) excitation pulse and proportions of excited spins are then detected using a resonant coil; images are then reconstructed from this data. Excitation pulses need to be tailored to a user’s specific needs and in most applications need to be as short as possible, due to spin relaxation, tissue heating, signal-to-noise ratio (SNR), and data readout limitations. The design of short-duration excitation pulses is an important topic and the focus of our work. One may show that RF excitation pulse design, under certain conditions, involves choosing to deposit energy in a continuous, 3-D, Fourier-like domain (“excitation k-space”) in order to form some desired excitation in the spatial domain. Energy may only be deposited along a 1-D contour, and there are ...
Adam C. Zelinski, Vivek K. Goyal, Elfar Adalsteins
Added 29 May 2010
Updated 29 May 2010
Type Conference
Year 2008
Where CISS
Authors Adam C. Zelinski, Vivek K. Goyal, Elfar Adalsteinsson, Lawrence L. Wald
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