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  • Research Article
  • Open Access

Dynamic MR-Imaging with Radial Scanning, a Post-Acquisition Keyhole Approach

  • Ralf Lethmate1Email author,
  • Frank T. A. W. Wajer2,
  • Yannick Crémillieux1,
  • Dirk van Ormondt2 and
  • Danielle Graveron-Demilly1
EURASIP Journal on Advances in Signal Processing20032003:794878

Received: 15 February 2002

Published: 14 April 2003


A new method for 2D/3D dynamic MR-Imaging with radial scanning is proposed. It exploits the inherent strong oversampling in the centre of -space, which holds crucial temporal information of the contrast evolution. It is based on (1) a rearrangement of (novel 3D) isotropic distributions of trajectories during the scan according to the desired time resolution and (2) a post-acquisition keyhole approach. The 2D/3D dynamic images are reconstructed using 2D/3D-gridding and 2D/3D-IFFT. The scan time is not increased with respect to a conventional 2D/3D radial scan of the same image resolution, in addition one benefits from the dynamic information. An application to in vivo ventilation of rat lungs using hyperpolarized helium is demonstrated.


2D/3D dynamic MRI3D isotropic radial samplingkeyholescan time reductionimage reconstructiongridding

Authors’ Affiliations

Laboratoire de Résonance Magnétique Nucléaire, CNRS UMR 5012, France
Department of Applied Physics, Delft University of Technology, Delft, The Netherlands


© Copyright © 2003 Hindawi Publishing Corporation 2003