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Simultaneous imaging and R2* mapping using a radial multi-gradient-echo (rMGE) sequence.

Stefanie Winkelmann1, Tobias Schaeffter, Steffen Weiss

  • 1Institute of Biomedical Engineering, University of Karlsruhe, Karlsruhe, Germany.

Journal of Magnetic Resonance Imaging : JMRI
|September 8, 2006
PubMed
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This study introduces a rapid MRI technique for real-time R2* mapping and imaging. It enables precise monitoring of contrast agent administration and image-guided drug delivery.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Radiology

Background:

  • Accurate monitoring of contrast agent dynamics is crucial for effective medical imaging and drug delivery.
  • Existing MRI techniques may lack the speed and real-time feedback required for dynamic processes.

Purpose of the Study:

  • To develop and demonstrate a rapid MRI technique combining imaging and R2* mapping.
  • To enable online monitoring of (super-)paramagnetic contrast agent administration.
  • To facilitate image-guided drug delivery applications.

Main Methods:

  • Utilized a single radial multi-gradient-echo (rMGE) sequence for data acquisition.
  • Employed interleaved undersampled radial k-spaces at various echo times (TEs).
  • Implemented a fast numerical algorithm on a real-time platform for online R2* estimation and high-resolution image generation.

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Main Results:

  • Achieved high-resolution R2* maps for phantoms and volunteer liver.
  • Demonstrated accurate mapping of high relaxation rates during contrast agent administration.
  • Provided a preliminary estimation of dynamic dosage based on R2* changes.

Conclusions:

  • The developed technique allows simultaneous online display of morphological and parametric MRI data.
  • Enables convenient and quantitative surveillance of contrast agent administration.
  • Offers potential for enhanced image-guided interventions and therapeutic monitoring.