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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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