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Optimization of hyperparameters for SMS reconstruction.

L Tugan Muftuler1, Volkan Emre Arpinar2, Kevin Koch2

  • 1Department of Neurosurgery, Medical College of Wisconsin, 8701 Watertown Plk Rd, Milwaukee, WI 53226, USA.

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Summary
This summary is machine-generated.

Optimizing simultaneous multi-slice (SMS) MRI reconstruction parameters is crucial for maintaining image quality. Fine-tuning hyperparameters based on coil and acceleration factors ensures reliable accelerated MRI data acquisition.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Simultaneous multi-slice (SMS) imaging accelerates MRI acquisition by exciting multiple slices at once.
  • Reconstructing SMS images requires mathematical models to separate overlapping slices, necessitating kernel estimation from calibration data.
  • Reconstruction parameter selection critically impacts SMS image fidelity and quality.

Purpose of the Study:

  • To investigate the impact of various SMS reconstruction parameters on image quality.
  • To determine optimal parameters for SMS imaging using different head coils and acceleration factors.
  • To assess the influence of coil compression on fMRI data fidelity.

Main Methods:

  • Acquired gradient-echo echo planar imaging data using SMS acceleration with two head coils (32- and 48-channel).
  • Reconstructed data using a hybrid space, externally-calibrated coil-by-coil slice unaliasing approach.
  • Assessed image quality via correlation with non-SMS data and compared fMRI group analysis results.

Main Results:

  • The 32-channel coil generally outperformed the 48-channel coil.
  • Larger calibration regions (144-192 samples) and smaller kernel sizes (2-4 samples) improved image quality.
  • Regularization (0.0001) and optimized hyperparameters yielded good image quality with minimal impact from coil compression on correlations and fMRI results.

Conclusions:

  • SMS reconstruction hyperparameters must be fine-tuned based on specific experimental factors like RF coil and acceleration factor.
  • A preliminary evaluation of SMS reconstruction hyperparameters is recommended before large-scale studies.
  • Optimized SMS reconstruction ensures high-fidelity accelerated MRI acquisition.