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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Quantitative Susceptibility Mapping: MRI at 7T versus 3T.

Pascal Spincemaille1, Julie Anderson2, Gaohong Wu2

  • 1Department of Radiology, Weill Cornell Medicine, New York, NY.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|October 19, 2019
PubMed
Summary

Ultrahigh-field 7T magnetic resonance imaging (MRI) offers improved quantitative susceptibility mapping (QSM) performance. 7T MRI achieves 3T image quality in half the scan time, demonstrating excellent reproducibility.

Keywords:
3T7TQuantitative susceptibility mappingreproducibility

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Quantitative Susceptibility Mapping (QSM)
  • Ultrahigh-field MRI

Background:

  • Ultrahigh-field 7T MRI offers significantly higher signal-to-noise ratio (SNR) compared to 3T MRI.
  • Quantitative Susceptibility Mapping (QSM) relies on phase data, benefiting from improved SNR at higher fields.
  • Magnetic susceptibility effects, crucial for QSM, are more pronounced and detectable at 7T.

Purpose of the Study:

  • To compare the performance of Quantitative Susceptibility Mapping (QSM) at 7T versus 3T MRI.
  • To evaluate intrascanner test-retest reproducibility of QSM at different field strengths and echo numbers.
  • To assess the impact of field strength on QSM image quality and scan time efficiency.

Main Methods:

  • Prospective study involving 10 healthy subjects.
  • Gradient echo data acquired at both 3T and 7T field strengths using 5 and 10 echoes, with repeated measurements.
  • Test-retest reproducibility assessed using Bland-Altman analysis and regression; image quality scored by a neuroradiologist.

Main Results:

  • Intrascanner bias for QSM was below 3.6 ppb (R² > .85), and interscanner bias was below 10.9 ppb (R² > .8).
  • No significant difference in image quality was found between 3T with 10 echoes and 7T with 5 echoes (P = .65).
  • Excellent image quality and good test-retest reproducibility were observed for QSM at 7T.

Conclusions:

  • Ultrahigh-field 7T MRI provides excellent image quality and good reproducibility for Quantitative Susceptibility Mapping (QSM).
  • 7T MRI enables achieving image quality comparable to 3T MRI but in approximately half the acquisition time.
  • This suggests 7T MRI is a highly efficient and effective tool for advanced neuroimaging applications like QSM.