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Abstract #3298

Filling the deadtime gap in zero echo time MRI: principles compared

Romain Nicolas Froidevaux1, Markus Weiger1, David Otto Brunner1, Bertram Jakob Wilm1, Benjamin Emanuel Dietrich1, and Klaas Paul Pruessmann1

1Institute for Biomedical Engineering, University and ETH Zurich, Z├╝rich, Switzerland

Often used for the imaging of compounds with short relaxation times, 3D center-out sequences performing broadband excitation on a ramped-up strong gradient provide very short acquisition delays and high bandwidth. In turn, data located around the k-space center is missed and needs to be recovered. Different approaches, like algebraic ZTE, WASPI or PETRA are used today. An important but still open question is how the relation of the deadtime and the T2s involved affect image quality. We show that critical situations occur for similar values of deadtime and T2, frequently encountered when imaging ultra-short-T2s in solid tissues or hardware parts.

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