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Abstract #4080

Free-Breathing Self-Gated 4D-Lung MRI with wave-CAIPI

Julian A. J. Richter1,2, Tobias Wech1, Andreas M. Weng1, Manuel Stich1, Simon Veldhoen1, Stefan Weick1, Thorsten A. Bley1, and Herbert Köstler1

1Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany, 2Comprehensive Heart Failure Center Würzburg, Würzburg, Germany

The wave-CAIPI technique was applied to self-gated dynamic Lung MRI during free breathing. To prevent synchronization between respiratory motion and phase-encoding, the order of the phase-encoding steps was randomized using non-uniformly distributed, two-dimensional random numbers which oversample the k-space center. Breathing motion was gated using an additionally recorded DC signal. A healthy volunteer was investigated using the proposed method and a standard Cartesian scan for reference. For a scan time of 10:46 min, both methods exhibit comparable image quality. However, for accelerated scans, the wave-CAIPI technique clearly shows reduced residual image artifacts after applying parallel imaging.

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