Journal article

Zero-gradient-excitation ramped hybrid encoding (zG(RF)-RHE) sodium MRI

Yasmin Blunck, Bradford A Moffat, Scott C Kolbe, Roger J Ordidge, Jon O Cleary, Leigh A Johnston

MAGNETIC RESONANCE IN MEDICINE | WILEY | Published : 2019

Abstract

PURPOSE: Fast bi-exponential transverse signal decay compounds sodium image quality. This work aims at enhancing image characteristics using a special case of ramped hybrid encoding (RHE). Zero-gradient-excitation (zGRF )-RHE provides (1) gradient-free excitation for high flip angle, artifact-free excitation profiles and (2) gradient ramping during dead-time for the optimization of encoding time (tenc ) to reduce T2 * signal decay influence during acquisition. METHODS: Radial zGRF -RHE and standard radial UTE were investigated over a range of receiver bandwidths in simulations, phantom and in vivo brain experiments. Central k-space in zGRF -RHE was acquired through single point measurements ..

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