Bertram Jakob Wilm1, Christoph Barmet1, Lars Kasper1, Max Haeberlin1, Benjamin Emanuel Dietrich1, Klaas Paul Pruessmann1
1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland
A combination of spiral MRI with partial Fourier phase constrained imaging could allow decreasing the acquisition duration, and thus to increase the achievable temporal resolution in MRI. However, accurate knowledge about the image phase that is required for partial Fourier imaging is hard to establish, since spiral imaging is very sensitive to any encoding deficiencies, such as gradient delays, eddy currents, concomitant fields and static B0 inhomogeneity. To overcome this problem, an accurate model of the dynamic field encoding is obtained by using dynamic field monitoring. The performance and the sensitivity against inaccuracy of the phase estimate are evaluated in vivo.
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