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Phase-cycled simultaneous multislice balanced SSFP imaging with CAIPIRINHA for efficient banding reduction.

Yi Wang1, Xingfeng Shao1, Thomas Martin1

  • 1Laboratory of FMRI Technology (LOFT), Department of Neurology, University of California Los Angeles, Los Angeles, California, USA.

Magnetic Resonance in Medicine
|December 16, 2015
PubMed
Summary

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This study introduces a faster method for reducing banding artifacts in balanced steady-state free precession (bSSFP) imaging. The new technique uses phase-cycled simultaneous multislice (SMS) imaging with CAIPIRINHA, improving image quality without increasing scan time.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Image Reconstruction

Background:

  • Balanced steady-state free precession (bSSFP) is a widely used MRI sequence known for its speed and contrast but is susceptible to banding artifacts.
  • These artifacts, arising from RF field inhomogeneity and off-resonance effects, can degrade image quality and diagnostic accuracy.
  • Existing banding reduction methods often require additional scan time or complex post-processing, limiting their clinical utility.

Purpose of the Study:

  • To develop and evaluate a time-efficient technique for banding reduction in bSSFP imaging.
  • To leverage phase-cycled simultaneous multislice (SMS) acquisition with CAIPIRINHA for accelerated imaging.
  • To demonstrate effective banding suppression within the conventional scan time of single-band bSSFP.

Main Methods:

Keywords:
balanced steady-state free precession (bSSFP)banding reductioncontrolled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)simultaneous multi-slice (SMS)

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  • The proposed method utilizes the phase modulation inherent in SMS imaging with CAIPIRINHA to acquire multiple phase-cycled images.
  • These images are then combined to achieve banding reduction.
  • Experiments included Bloch simulations, phantom studies, and in vivo imaging (brain, abdomen, cardiac) in healthy volunteers at 3T using SMS acceleration factors of 2-4.

Main Results:

  • Successful removal or significant suppression of banding artifacts was achieved across SMS acceleration factors of 2-4.
  • The effectiveness of banding reduction improved with higher SMS factors.
  • Increased signal-to-noise ratio (SNR) efficiency was observed with improved banding reduction.

Conclusions:

  • Phase-cycled SMS bSSFP with CAIPIRINHA offers a promising approach for efficient banding artifact reduction.
  • This technique enables banding reduction without extending scan duration.
  • Further investigation in clinical settings is recommended to assess its broader applicability.