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Department of Radiology - Medical Physics

MR-image reconstruction/enhancement

Gibbs Ringing Removal

Gibbs-ringing is a well known artifact which manifests itself as spurious oscillations in the vicinity of sharp image transients, e.g. at tissue boundaries. In this project we invetsigate a simple and robust method which exploits a different view on the Gibbsphenomena. The truncation in k-space can be interpreted as a convolution with a sinc-function in image space. Hence, the severity of the artifacts depends on how the sinc-function is sampled. We propose to reinterpolate the image based on local, subvoxel shifts to sample the ringing pattern at the zero-crossings of the oscillating sinc-function. 

  • E. Kellner and B. Dhital and V. Kiselev and M. Reisert
     "Gibbs-ringing artifact removal based on local subvoxel-shifts"
     Magnetic resonance in medicine, 2015, Wiley Online Library


 

MR-image reconstruction

In general we are interested MR-image recsontruction and trajectory design and have several ongoing collaborations in this field

  • M. Meissner, M. Reisert, T. Hugger, J. Hennig, D. von Elverfeldt and J. Leupold
    "Revealing signal from noisy 19F MR images by chemical shift artifact correction"
    Magnetic Resonance in Medicine, 2014, Wiley Online Library
  • G. Schultz, D. Gallichan, M. Reisert, J. Hennig, and M. Zaitsev
    "MR image reconstruction from generalized projections"
    Magnetic Resonance in Medicine, 2013, Wiley Online Library
  • Jakob Assländer, Benjamin Zahneisen, Thimo Hugger, Marco Reisert, Hsu-Lei Lee, Pierre LeVan and Jürgen Hennig
    "Single shot whole brain imaging using spherical stack of spirals trajectories"
    Neuroimage, Volume 73, June 2013, Pages 59–70
  • Benjamin Zahneisen, Thimo Hugger, Kuan J. Lee, Pierre LeVan, Marco Reisert, Hsu-Lei Lee, Jakob Assländer, Maxim Zaitsev, Jürgen Hennig
    "Single shot concentric shells trajectories for ultra fast fMRI"
    Magnetic Resonance in Medicine, Nov 2011, Epub, DOI: 10.1002/mrm.23256 

Dr. Marco Reisert
Group Leader

Tel. +49 761 270-93860
E-Mail: marco.reisert@uniklinik-freiburg.de

University Medical Center Freiburg
Dept. of Radiology · Medical Physics
Killianstr. 5a       
79106 Freiburg, Germany