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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Single-shot spiral imaging at 7 T.

Maria Engel1, Lars Kasper1,2, Christoph Barmet1,3

  • 1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland.

Magnetic Resonance in Medicine
|March 26, 2018
PubMed
Summary

This study demonstrates that single-shot spiral MRI at 7 Tesla, using an advanced signal model, achieves high-quality, high-resolution brain imaging. This technique offers excellent image fidelity for advanced applications like functional MRI.

Keywords:
algebraic image reconstructionmagnetic field monitoringsingle-shot spiralspiral imaging

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • High-Field MRI
  • Image Reconstruction

Background:

  • High-field MRI (7 Tesla) offers increased signal-to-noise ratio, enabling higher resolution imaging.
  • Traditional MRI reconstruction methods may struggle with artifacts at high fields.
  • Spiral imaging sequences provide faster acquisition but can be sensitive to field inhomogeneities.

Purpose of the Study:

  • To evaluate the feasibility and performance of single-shot spiral MRI at 7 Tesla.
  • To develop and apply an expanded signal model for improved image reconstruction.
  • To assess the achievable image resolution and quality.

Main Methods:

  • Gradient-echo brain imaging was performed at 7 Tesla using single-shot and half-shot spiral readouts.
  • An expanded signal model incorporated coil sensitivity, static off-resonance, and concurrent magnetic field dynamics.
  • Image resolution was quantified using point spread function analysis.

Main Results:

  • Single-shot spiral imaging achieved a nominal resolution of 0.8 mm with high depiction fidelity.
  • Effective resolutions of 0.8 mm (CSF), 0.94 mm (gray matter), and 0.98 mm (white matter) were obtained.
  • Half-shot acquisition yielded high-quality image pairs at 1.5 mm resolution.

Conclusions:

  • An expanded signal model significantly enhances single-shot spiral MRI quality at 7 Tesla.
  • This technique leverages high-field benefits for rapid, high-resolution imaging.
  • It is particularly promising for functional MRI and arterial spin labeling applications.