Robust real-time MR-geometric distortion correction for interventional procedure on mobile targets

B. Denis De Senneville, M. Ries, C. T.W. Moonen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Rapid dynamic MR-imaging can provide both functional and positional informations in real-time, which can be used to retroactively control an interventional procedure. Although rapid echo-planar imaging (EPI) is frequently used in this role, EPI often suffers from geometric distortions. These signal localization errors are caused by spatial magnetic field inhomogeneities induced by magnetic suceptibility variations within the human body and instrumental limitations of the acquisition system. This type of artifact can be addressed by mapping and converting the spatial magnetic field inhomogeneities a priori into a pixel shift and to subsequently correct the EPI-images. Furthermore, for real time guidance of interventions in organs subject to periodical physiological motion, the correction needs to account for time variant changes of the magnetic field during the motion cycle. The correction described in this paper consists of two steps: A parameterized model of the motion induced magnetic field perturbation is computed in a preparative step; subsequently, during the intervention, this model is used to reconstruct the magnetic field perturbation corresponding to the actual organ position in real-time, which in turns allows computation of distortion corrected MR-images.

Original languageEnglish
Title of host publication2012 9th IEEE International Symposium on Biomedical Imaging
Subtitle of host publicationFrom Nano to Macro, ISBI 2012 - Proceedings
Pages964-967
Number of pages4
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 9th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, ISBI 2012 - Barcelona, Spain
Duration: 2 May 20125 May 2012

Publication series

NameProceedings - International Symposium on Biomedical Imaging
ISSN (Print)1945-7928
ISSN (Electronic)1945-8452

Conference

Conference2012 9th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, ISBI 2012
Country/TerritorySpain
CityBarcelona
Period2/05/125/05/12

Keywords

  • Magnetic Resonance Imaging
  • Motion analysis
  • Real time systems

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