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 MRI 3D isotropic radial sampling keyhole scan time reduction image reconstruction gridding

Authors’ Affiliations

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


© Copyright © 2003 Hindawi Publishing Corporation 2003