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Double inversion black-blood fast spin-echo imaging of the human heart: a comparison between 1.5T and 3.0T

Robert L Greenman1, John E Shirosky, Robert V Mulkern

  • 1Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02115, USA. rgreenma@caregroup.harvard.edu

Journal of Magnetic Resonance Imaging : JMRI
|May 27, 2003
PubMed

Insights

Black-blood cardiac MRI at 3.0 Tesla shows equivalent blood suppression but poorer signal uniformity compared to 1.5 Tesla. Modifications are needed for high-field MRI to improve image quality.

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • High-field MRI (3.0 Tesla) offers potential for improved signal-to-noise ratio (SNR).
  • Black-blood imaging techniques are crucial for cardiac MRI to suppress blood signal.
  • Double-inversion recovery fast spin-echo (DIR FSE) is a common sequence for black-blood imaging.

Purpose of the Study:

  • To compare the effectiveness of blood suppression and image quality of black-blood cardiac MRI at 3.0T versus 1.5T.
  • To evaluate signal uniformity and SNR in cardiac images acquired at different magnetic field strengths.

Main Methods:

  • Cardiac MRI was performed on normal volunteers using T2-weighted DIR FSE sequences at 1.5T and 3.0T.
  • Region-of-interest measurements assessed blood suppression, myocardial SNR, and signal uniformity.
  • B1 field maps were acquired at both field strengths.

Main Results:

  • Blood suppression performance was comparable between 1.5T and 3.0T.
  • The SNR improvement at 3.0T was less than anticipated.
  • Signal uniformity was significantly reduced at 3.0T due to dielectric effects and shorter RF wavelengths.

Conclusions:

  • Standard DIR FSE sequences may produce significant signal variations at 3.0T without adjustments.
  • Further research into B1-insensitive methods is necessary to optimize spin-echo sequences for high-field cardiac MRI.
Abstract

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