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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Cardiac Magnetic Resonance Imaging at 7 Tesla

Published on: January 6, 2019

Dual-echo arteriovenography imaging with 7T MRI.

Kyongtae Ty Bae1, Sung-Hong Park, Chan-Hong Moon

  • 1Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA. baek@upmc.edu

Journal of Magnetic Resonance Imaging : JMRI
|December 23, 2009
PubMed
Summary

This study developed a 7T MRI technique for simultaneous time-of-flight MR angiography and blood oxygenation level-dependent MR venography. The 7T method significantly improved visualization of small arteries and veins compared to 3T MRI.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging
  • Vascular Imaging

Background:

  • High-field MRI at 7 Tesla (T) offers potential for enhanced signal-to-noise ratio (SNR) and contrast.
  • Simultaneous acquisition of different MRI contrasts, such as angiography and venography, remains challenging.
  • Optimizing sequences for both arterial and venous imaging is crucial for comprehensive vascular assessment.

Purpose of the Study:

  • To implement and evaluate a dual-echo MRI sequence at 7T for simultaneous time-of-flight MR angiography (TOF-MRA) and blood oxygenation level-dependent MR venography (BOLD-MRV).
  • To compare the image quality of 7T TOF-MRA and BOLD-MRV with those acquired at 3T.
  • To assess the feasibility of improved visualization of small cortical vessels.

Main Methods:

  • A dual-echo sequence with echo-specific k-space reordering was developed for 7T MRI.
  • Scan parameters were optimized for compatible MRA and MRV acquisition, maximizing vascular contrast.
  • The sequence was implemented at both 7T and 3T, with four subjects imaged at each field strength. 7T images were reconstructed with and without phase-mask filtering.

Main Results:

  • 7T MRI demonstrated substantially better depiction of small cortical arteries and veins compared to 3T.
  • Contrast-to-noise ratio (CNR) for arteries at 7T was approximately double that at 3T (164±57 vs. 77±26).
  • Venous contrast at 7T (65±7) was higher than at 3T with phase-mask filtering (36±6), even without filtering at 7T.

Conclusions:

  • The implemented dual-echo arteriovenography technique at 7T significantly improves visualization of small vessels.
  • Enhanced signal-to-noise ratio (SNR) and susceptibility contrast at 7T contribute to superior MRA and MRV.
  • This 7T technique offers a promising advancement for detailed vascular imaging compared to 3T.