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Enhanced quantitative susceptibility mapping (QSM) using real-time field control.

Pinar Senay Özbay1,2, Yolanda Duerst2, Bertram Jakob Wilm2

  • 1University Hospital Zurich and University of Zurich, Institute of Diagnostic and Interventional Radiology, Zurich, Switzerland.

Magnetic Resonance in Medicine
|May 31, 2017
PubMed
Summary
This summary is machine-generated.

Real-time field control (FC) significantly improved quantitative susceptibility mapping (QSM) at 7T by minimizing magnetic field fluctuations. This technique enhances image quality and accuracy in both phantoms and human brain imaging.

Keywords:
7 TNMR field probesfield controlgradient echophasequantitative susceptibility mapping (QSM)

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Medical Physics

Background:

  • Quantitative susceptibility mapping (QSM) is sensitive to spatiotemporal magnetic field fluctuations.
  • These fluctuations can degrade image quality and accuracy, particularly at high field strengths like 7T.
  • Developing methods to mitigate these effects is crucial for reliable QSM.

Purpose of the Study:

  • To evaluate a real-time field-control (FC) system for its potential to reduce the impact of magnetic field variations in 7T QSM.
  • To assess the effectiveness of FC in improving image quality and quantitative accuracy under perturbed field conditions.

Main Methods:

  • Acquired magnitude, phase, and QSM images of phantoms and healthy volunteers at 7T.
  • Induced field perturbations (FP) using water-bottle displacement (phantoms) and physiological movements (volunteers).
  • Compared imaging with and without the real-time FC system, which actively minimized field variations.

Main Results:

  • FC successfully eliminated FP-induced image quality degradation in phantoms.
  • FC improved the linearity of susceptibility measurements with increasing gadolinium concentration.
  • In volunteers, FC restored the visibility of brain structures and reduced susceptibility variations caused by FP.

Conclusions:

  • Real-time field control is a promising technique for enhancing the robustness and accuracy of 7T QSM.
  • FC improves the delineation of anatomical details and the reliability of quantitative susceptibility values.
  • This system effectively compensates for dynamic magnetic field instabilities during MRI acquisition.