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Fast quantitative susceptibility mapping using 3D EPI and total generalized variation.

Christian Langkammer1, Kristian Bredies2, Benedikt A Poser3

  • 1MGH Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Harvard Medical School, Boston, MA, USA; Department of Neurology, Medical University of Graz, Graz, Austria.

Neuroimage
|March 4, 2015
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Summary
This summary is machine-generated.

A new method for quantitative susceptibility mapping (QSM) uses total generalized variation (TGV) to achieve 1mm isotropic resolution whole-brain images in seconds. This rapid, robust QSM technique enhances insights into tissue properties.

Keywords:
Dipole inversionIronMyelinQuantitative susceptibility mappingSusceptibility tensor imagingTotal generalized variationTotal variation

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Area of Science:

  • Neuroimaging
  • Biophysics
  • Medical Physics

Background:

  • Quantitative susceptibility mapping (QSM) reveals tissue composition via magnetic properties, sensitive to myelin, fiber orientation, and trace elements.
  • Current QSM methods face limitations in image resolution due to long acquisition times and high signal-to-noise ratio (SNR) requirements for dipole inversion.
  • Existing QSM techniques struggle with artifacts and require extensive processing time, limiting clinical applicability.

Purpose of the Study:

  • To develop a novel, single-step total generalized variation (TGV) based method for quantitative susceptibility mapping (QSM) reconstruction.
  • To improve QSM robustness and speed, enabling rapid acquisition of high-resolution images, particularly in low SNR conditions.
  • To validate the TGV-QSM method using numerical phantoms and in vivo imaging at 3 and 7 Tesla.

Main Methods:

  • A unified TGV-based reconstruction algorithm integrating phase unwrapping, background field removal, and dipole inversion into a single iterative process.
  • Rapid 3D echo-planar imaging (EPI) sequences were employed for phase data acquisition, suitable for low SNR environments.
  • The proposed TGV-QSM method was compared against traditional total variation (TV) methods using numerical phantoms and in vivo human brain data.

Main Results:

  • The TGV-QSM method achieved 1mm isotropic whole-brain images in just 10 seconds on a clinical 3 Tesla scanner.
  • TGV-QSM demonstrated superior performance over TV, enforcing higher-order smoothness and yielding results closer to ground truth.
  • The method effectively prevented stair-casing artifacts, a common issue in traditional QSM reconstructions.

Conclusions:

  • 3D EPI acquisition combined with single-step TGV reconstruction provides reliable, whole-brain QSM images with 1mm isotropic resolution in seconds.
  • The significantly reduced acquisition time and robust reconstruction performance of TGV-QSM open avenues for new clinical applications.
  • Potential applications include QSM in less compliant patient populations, clinical susceptibility tensor imaging, and resting-state functional neuroimaging.