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Radial streak artifact reduction using phased array beamforming.

Sagar Mandava1,2, Mahesh B Keerthivasan1,2, Diego R Martin2

  • 1Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona.

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|February 14, 2019
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Summary
This summary is machine-generated.

A novel phased array filtering technique effectively reduces streak artifacts in radial MRI without signal loss. This method outperforms existing techniques, offering superior image quality for large field-of-view applications.

Keywords:
abdominal imagingbeamformingcoil selectionphased arrayradial MRIstreaking artifacts

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Processing
  • Medical Imaging Technology

Background:

  • Radial MRI, particularly for large fields-of-view, is prone to streak artifacts caused by gradient nonlinearities.
  • Existing coil removal methods mitigate artifacts but often result in significant signal loss.

Purpose of the Study:

  • To introduce a new method for streak artifact reduction in radial MRI using phased array filtering.
  • To suppress streaking artifacts without compromising signal integrity.

Main Methods:

  • The proposed method employs phased array beamforming, a spatial filtering technique.
  • Interference covariance is generated from manually extracted artifact samples to suppress streaking.
  • Performance was evaluated on abdomen radial fast spin echo images acquired at 1.5T and compared to existing methods.

Main Results:

  • The new method effectively suppresses streak artifacts.
  • No noticeable signal loss was observed with the proposed technique.
  • Quantitative analysis confirmed the superiority of this method over previous approaches.

Conclusions:

  • Phased array beamforming combined with interference covariance is a viable strategy for streak artifact reduction in radial MRI.
  • This technique offers an effective alternative to coil pruning methods, preserving signal quality.