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Ultrasound-driven cardiac MRI.

Francesco Santini1, Laura Gui2, Orane Lorton2

  • 1Department of Radiology, Division of Radiological Physics, University Hospital Basel, Basel, Switzerland; Department of Biomedical Engineering, University of Basel, Basel, Switzerland.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
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This study introduces a novel respiratory motion compensation technique for cardiac MRI using abdominal ultrasound. The method achieves high-resolution cardiac imaging during free breathing, overcoming limitations of traditional methods.

Keywords:
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Area of Science:

  • Medical Imaging
  • Cardiovascular Technology
  • Biomedical Engineering

Background:

  • Cardiac MRI faces challenges with respiratory motion, impacting image quality.
  • Current compensation methods like breath-holding and MR navigation have limitations.
  • Real-time motion compensation is crucial for efficient cardiac imaging.

Purpose of the Study:

  • To develop and evaluate a novel respiratory motion compensation technique for cardiac MRI.
  • To utilize abdominal ultrasound for real-time slice tracking and adaptation.
  • To enable high-resolution cardiac imaging during free breathing.

Main Methods:

  • Developed a custom workflow with an MR-compatible ultrasound system and predictive motion tracking.
  • Implemented a custom MR sequence for real-time slice position adaptation.
  • Evaluated the system on a moving phantom and in vivo, tracking liver blood vessels to estimate cardiac motion.

Main Results:

  • In vitro, predictive motion correction significantly improved results compared to non-corrected acquisitions (p < 0.01).
  • In vivo, predictive correction yielded image quality comparable to breath-holding.
  • Uncorrected images exhibited noticeable blurring artifacts.

Conclusions:

  • Ultrasound navigation with tracking enables real-time adaptation of MR imaging slices.
  • This technique facilitates efficient cardiac imaging with resolutions unachievable in a single breath-hold.
  • The method offers a promising solution for overcoming respiratory motion artifacts in cardiac MRI.