Abstract #2954
Correcting for encoding filed imperfections in arterial spin labeling using gradient impulse responses and concurrent field monitoring
Mustafa Cavusoglu 1 , Lars Kasper 1 , Johanna S. Vannesjo 2 , Benjamin E. Dietrich 1 , Simon Gross 1 , and Klaas P. Pruessmann 1
1
Biomedical Engineering, ETH Zurich, Zurich,
Zurich, Switzerland,
2
FMRIB
centre, Oxford University, Oxford, United Kingdom
Arterial spin labeling requires fast coverage of k-space
which is often achieved by using gradient-echo-EPI as
the readout sequence. This demands the gradients to be
employed at the limits of the system capabilities and to
be switched rapidly during the course of the
acquisitions making acquisition highly vulnerable to
gradient field imperfections. In this work, we directly
measured the gradient field evolution monitored using a
dynamic field camera and reconstructed the images based
on gradient impulse response function predicted and
concurrently monitored k-space trajectories. We explored
the effects of gradient field imperfection driven
artifacts on the absolute perfusion weighted images.
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