Improved reconstruction of nonlinear spatial encoding techniques with explicit intra-voxel dephasing
Kelvin Layton 1 , Stefan Kroboth 1 , Feng Jia 1 , Sebastian Littin 1 , Huijun Yu 1 , and Maxim Zaitsev 1
Medical Physics, University Medical Center
Freiburg, Freiburg, Baden-Wrttemberg, Germany
Spatial encoding magnetic fields (SEMs) that vary
nonlinearly over the field-of-view offer potential
advantages for image encoding. This work investigates
intra-voxel dephasing in the imaging plane when
nonlinear SEMs are used. Intra-voxel dephasing reduces
the signal from a voxel for strong encoding moments
depending on the location of the pixel and the nonlinear
fields used. A new signal model explicitly accounting
for intra-voxel dephasing is derived to accurately
explain experimental data acquired with nonlinear SEMs.
Images reconstructed using the new signal model exhibit
substantially less noise and fewer artifacts compared to
the traditional signal encoding model.
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