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GPU-accelerated Bloch simulations and MR-STAT reconstructions using the Julia programming language.

Oscar van der Heide1,2, Cornelis A T van den Berg1,2, Alessandro Sbrizzi1,2

  • 1Computational Imaging Group for MR Diagnostics and Therapy, Center for Image Sciences, University Medical Center Utrecht, Utrecht, The Netherlands.

Magnetic Resonance in Medicine
|March 5, 2024
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Summary
This summary is machine-generated.

GPU acceleration significantly reduces Magnetic Resonance Statistics-based Transformation (MR-STAT) reconstruction times. A new Bloch simulation toolbox, BlochSimulators.jl, enables 2D MR-STAT reconstructions in approximately one minute.

Keywords:
Bloch simulationsCUDAJuliaMR‐STATquantitative MRI

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Computational Physics
  • Medical Imaging

Background:

  • MR-STAT is a quantitative MRI technique that faces challenges with long reconstruction times.
  • Quantitative parameter maps are generated by solving complex nonlinear optimization problems.
  • Efficient reconstruction is crucial for the clinical applicability of MR-STAT.

Purpose of the Study:

  • To reduce MR-STAT reconstruction times by leveraging GPU hardware.
  • To develop a highly optimized, GPU-compatible Bloch simulation toolbox.
  • To improve the overall efficiency of quantitative MRI techniques.

Main Methods:

  • Developed BlochSimulators.jl, a GPU-compatible Bloch simulation toolbox using Julia.
  • Implemented a GPU-accelerated, partially matrix-free MR-STAT reconstruction algorithm.
  • Benchmarked BlochSimulators.jl against existing toolboxes and compared MR-STAT reconstruction times on GPU versus previous methods.

Main Results:

  • BlochSimulators.jl demonstrated superior runtime performance on both CPU and GPU.
  • The GPU-accelerated MR-STAT algorithm achieved reconstructions in 68 seconds per 2D slice.
  • Significant reduction in reconstruction time was observed compared to previous MR-STAT implementations.

Conclusions:

  • Combining the Bloch simulation toolbox and the optimized algorithm enables 2D MR-STAT reconstructions in about one minute on modern GPUs.
  • The Bloch simulation toolbox has broader applications in quantitative MRI, including MR Fingerprinting.
  • GPU acceleration is a viable strategy for accelerating complex MRI reconstruction techniques.