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• W2012136333 abstract "Several water content mapping techniques are based on the acquisition of multiple gradient echoes (GE) with different echo times (TE). However, in the presence of linear magnetic field gradients Gsusc the signal decay is no longer exponential but in the case of a rectangular slice profile weighted by a sinc function, giving rise to erroneous initial amplitudes S0 in monoexponential fitting. Generally, it can be shown that the signal decay is weighted by the time profile of the excitation pulse. Thus, for an excitation pulse with an exponential time profile, i.e., a Lorentzian slice profile, the signal decay remains exponential and exponential fitting still yields the correct amplitude S0. Multiecho GE images of a gel phantom and five human volunteers were acquired at 3 T using a sinc-shaped and an exponential excitation pulse. In addition, simulations were performed to investigate the influence of saturation effects due to distortion of the ideal Lorentzian slice profile. A considerable overestimation of S0 when using a sinc-shaped excitation pulse was observed. Errors were greatly reduced with an exponential excitation pulse. We thus propose the use of excitation pulses with exponential time profile to obtain accurate estimates for S0 from exponential fitting. Magn Reson Med 60:908–916, 2008. © 2008 Wiley-Liss, Inc." @default.
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• W2012136333 date "2008-10-01" @default.
• W2012136333 modified "2023-10-05" @default.
• W2012136333 title "Exponential excitation pulses for improved water content mapping in the presence of background gradients" @default.
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• W2012136333 doi "https://doi.org/10.1002/mrm.21730" @default.
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