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Fast Imaging Technique for fMRI: Consecutive Multishot Echo Planar Imaging Accelerated with GRAPPA Technique.

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This study introduces a new functional imaging technique, consecutive multishot echo planar imaging (cmsEPI) with parallel imaging, enhancing signal-to-noise ratio (SNR) and reducing scan time for better brain imaging results.

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging Techniques
  • Biomedical Engineering

Background:

  • Echo planar imaging (EPI) is crucial for functional neuroimaging but suffers from lower signal-to-noise ratio (SNR).
  • Consecutive multishot EPI (cmsEPI) aims to improve SNR and reduce acquisition time.
  • Parallel imaging techniques like GRAPPA can accelerate data acquisition.

Purpose of the Study:

  • To evaluate the combined cmsEPI and parallel imaging (GRAPPA) for functional imaging.
  • To assess improvements in signal-to-noise ratio (SNR) and acceleration capabilities.
  • To investigate the impact on functional sensitivity and geometric distortions.

Main Methods:

  • Developed a cmsEPI sequence incorporating variable flip angles and consecutively acquired segments.
  • Integrated the cmsEPI sequence with the generalized autocalibrating partially parallel acquisitions (GRAPPA) method.
  • Measured temporal SNRs at various acceleration factors (R=2, R=3) and segment numbers; examined geometric distortions.

Main Results:

  • The combined cmsEPI and GRAPPA technique improved temporal SNR by up to 18% (phantom) and 8.2% (in vivo) compared to cmsEPI alone.
  • Data collection time decreased proportionally with the acceleration factor.
  • Improved temporal SNR led to enhanced statistical power for evaluating brain functional responses.

Conclusions:

  • The combination of cmsEPI with parallel imaging significantly enhances functional sensitivity in neuroimaging.
  • This technique effectively compensates for the inherent lower SNR of cmsEPI.
  • The method offers improved SNR and reduced scan times, crucial for effective functional imaging studies.