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Abstract #4587

2D k-space waves for silent EPI acquisitions

Jenni Schulz1, Riccardo Metere1, Dennis Klomp2,3, and David G Norris1,4

1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, Netherlands, 2Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 3MR Coils BV, Zaltbommel, Netherlands, 4Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany

High acoustic noise levels in fMRI-acquisitions are not only problematic in terms of undesired activation patterns in the brain, but also with respect to patient comfort. A 2D-EPI sequence is presented which is capable of acquiring fMRI-data in silent mode by using a head insert z-gradient coil. For silent data acquisition, a wave-like k-space trajectory is then required. The sequence is compared to a standard FLASH and EPI acquisition. The measured acoustic noise of the silent 2D-EPI is in the order of the idle mode of the scanner and arises from the sound of the continuously active helium pump.

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