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Coil compression in simultaneous multislice functional MRI with concentric ring slice-GRAPPA and SENSE.

Alan Chu1, Douglas C Noll2

  • 1Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA. alanchu@umich.edu.

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Summary

We developed a new coil compression method for simultaneous multislice (SMS) functional MRI (fMRI). This technique reduces computational load while preserving functional activation, making accelerated fMRI more efficient.

Keywords:
GRABSMACCGRAPPASENSEcoil compressionfMRImultibandsimultaneous multislice

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Biomedical Engineering

Background:

  • Simultaneous multislice (SMS) imaging accelerates functional magnetic resonance imaging (fMRI) acquisition.
  • Higher acceleration rates in SMS-fMRI necessitate more receive coils, increasing computational demands.
  • Existing coil compression methods may struggle with the increased data from advanced SMS techniques.

Purpose of the Study:

  • To propose and evaluate a novel coil compression method for concentric ring non-Cartesian SMS fMRI.
  • To assess the method's effectiveness in reducing computational burden while preserving functional activation.
  • To compare the proposed method against standard coil compression techniques in SMS-fMRI.

Main Methods:

  • A slice-separation k-space kernel was employed to compress coil data into virtual coils.
  • fMRI scans were acquired from five subjects using both non-SMS and SMS (3 slices) sequences.
  • The proposed method was applied to SMS-fMRI data and compared with conventional coil compression approaches.

Main Results:

  • The proposed coil compression method preserved functional activation using fewer virtual coils compared to standard SMS coil compression.
  • Non-SMS fMRI compression maintained activation with slightly fewer virtual coils but lacked SMS acceleration benefits.
  • The method demonstrated practical utility for compressing and reconstructing concentric ring SMS data.

Conclusions:

  • The developed coil compression technique is effective for concentric ring SMS fMRI.
  • It offers improved preservation of functional activation compared to standard methods.
  • This approach enhances the efficiency and practicality of accelerated fMRI acquisition.