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


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.

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Correspondence to Ralf Lethmate.

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Lethmate, R., Wajer, F.T.A.W., Crémillieux, Y. et al. Dynamic MR-Imaging with Radial Scanning, a Post-Acquisition Keyhole Approach. EURASIP J. Adv. Signal Process. 2003, 794878 (2003).

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  • 2D/3D dynamic MRI
  • 3D isotropic radial sampling
  • keyhole
  • scan time reduction
  • image reconstruction
  • gridding