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Time efficient whole-brain coverage with MR Fingerprinting using slice-interleaved echo-planar-imaging.

Benedikt Rieger1,2, Mehmet Akçakaya3,4, José C Pariente2

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This study enhances Magnetic Resonance Fingerprinting (MRF) for faster tissue parameter mapping using slice-interleaved acquisition. The improved method achieves accurate T1, T2*, and PD quantification with significantly reduced scan times.

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Area of Science:

  • Biomedical Imaging
  • Quantitative MRI
  • Medical Physics

Background:

  • Magnetic Resonance Fingerprinting (MRF) enables rapid, simultaneous quantification of multiple tissue parameters.
  • Current MRF techniques, particularly MRF-EPI, face limitations in coverage speed and efficiency.
  • Optimizing acquisition schemes is crucial for advancing quantitative MRI applications.

Purpose of the Study:

  • To enhance Magnetic Resonance Fingerprinting based on Echo-Planar Imaging (MRF-EPI) using a slice-interleaved acquisition scheme.
  • To improve the speed and coverage of MRF for simultaneous T1, T2*, and proton density (PD) mapping.
  • To validate the accuracy and feasibility of the proposed slice-interleaved MRF-EPI technique.

Main Methods:

  • Modified MRF-EPI to acquire multiple slices in a randomized, interleaved manner, increasing effective repetition time.
  • Utilized per-slice signal-trace matching to a precomputed dictionary for T1 and T2* mapping with B1+ correction.
  • Incorporated coil sensitivity profile compensation and CSF normalization for quantitative PD mapping.
  • Performed numerical simulations to optimize slice interleaving and validated findings in phantom and in-vivo scans.

Main Results:

  • Numerical simulations suggested an optimal trade-off with four interleaved slices.
  • Phantom scans demonstrated excellent agreement with reference measurements for T1 (-2.4±1.1%), T2* (-0.5±2.5%), and PD (-0.5±7.2%).
  • In-vivo whole-brain imaging of T1, T2*, and PD with 32 slices was achieved in 3 minutes 36 seconds, a 4-fold reduction in scan time compared to single-slice MRF-EPI.

Conclusions:

  • Slice-interleaved MRF-EPI significantly accelerates quantitative multi-parameter mapping.
  • The method provides high-quality T1, T2*, and PD maps with high accuracy and precision.
  • This advancement offers a substantial reduction in scan time, enhancing clinical feasibility for quantitative MRI.