MRI reconstruction methods comprising model-based motion correction modules often rely on the assumption of absence or piecewise constant motion patterns during signal readout and on the insignificance of spin history effects. Furthermore, the success of such methods also depends on the characteristics and motion sensitivity of the employed sequence and measured tissue properties and may therefor limit the general utility of such approaches in a clinical context. The present study demonstrates the limitations of Fourier-model-based motion correction reconstruction schemes by subtle violations of the piecewise constant motion assumption using Bloch simulations a model-based motion-corrected reconstruction approach.
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