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Related Experiment Videos

Real-time accelerated interactive MRI with adaptive TSENSE and UNFOLD.

Michael A Guttman1, Peter Kellman, Alexander J Dick

  • 1Laboratory of Cardiac Energetics, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. mguttman@nih.gov

Magnetic Resonance in Medicine
|July 24, 2003
PubMed
Summary

Real-time MRI uses advanced techniques like time-adaptive sensitivity encoding (TSENSE) and UNFOLD to improve motion depiction. A new software system enhances reconstruction speed and display for interactive, image-guided procedures.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • Real-time MRI benefits from reduced field-of-view (FOV) acceleration techniques.
  • Time-adaptive sensitivity encoding (TSENSE) and UNFOLD improve motion depiction but require significant computational resources for high frame rates and low latency.

Purpose of the Study:

  • To implement and evaluate a high-performance software system for TSENSE and UNFOLD reconstructions in real-time MRI.
  • To enable interactive, on-line display for image-guided procedures.

Main Methods:

  • Developed a high-performance software system for TSENSE and UNFOLD reconstructions.
  • Utilized a steady-state free precession (SSFP) sequence for imaging.
  • Demonstrated functionality with normal volunteers and animal cardiac interventional experiments.

Related Experiment Videos

  • Investigated methods to overcome TSENSE challenges in interactive imaging, including temporary disabling and hybrid reconstruction approaches.

    • Main Results:

    • The system supports TSENSE and UNFOLD reconstructions for real-time MRI with interactive display.
    • An acceleration factor of 2 was used, limiting the imaging rate to seven frames per second for adequate image quality.
    • Both TSENSE and UNFOLD improved the spatial-temporal resolution trade-off in real-time imaging.
    • UNFOLD offers flexibility without receiver coil constraints, though temporal filtering can blur motion.
    • Proposed methods address TSENSE transient artifacts and suggest hybrid reconstruction for combined coil types.

    Conclusions:

    • TSENSE and UNFOLD are effective for real-time MRI, enhancing interactive imaging capabilities.
    • The developed software system facilitates improved image-guided procedures.
    • Hybrid reconstruction strategies offer solutions for complex coil configurations in real-time MRI.