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Related Experiment Video

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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Published on: January 6, 2019

Self-calibrated multiple-echo acquisition with radial trajectories using the conjugate gradient method (SMART-CG).

Youngkyoo Jung1, Alexey A Samsonov, Mark Bydder

  • 1Department of Radiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA. yojung@wfubmc.edu

Journal of Magnetic Resonance Imaging : JMRI
|March 31, 2011
PubMed
Summary

A new algorithm corrects phase inconsistencies in multiecho radial MRI, improving image quality. This method effectively removes signal dropouts and undersampling artifacts for faster 3D MRI acquisition.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Reconstruction
  • Signal Processing

Background:

  • Phase inconsistencies between multiple echoes degrade MRI image quality.
  • Radial acquisition in MRI offers inherent phase and magnitude information.
  • Parallel imaging enhances MRI data acquisition speed.

Purpose of the Study:

  • To develop an algorithm for self-correction of phase inconsistencies in multiecho radial MRI.
  • To enable simultaneous support for parallel imaging in multi-coil acquisitions.

Main Methods:

  • Generated phase estimates from each echo in a multiple echo train without a separate field map.
  • Utilized in vivo coil sensitivities derived from magnitude and phase estimates.
  • Employed a conjugate gradient method for simultaneous phase correction and parallel imaging benefits.

Main Results:

  • Demonstrated substantial improvements in overall image quality.
  • Successfully removed signal dropouts.
  • Effectively suppressed undersampling artifacts.

Conclusions:

  • The developed algorithm effectively removes phase cancellation and undersampling artifacts simultaneously.
  • The technique significantly improves image quality in multiecho radial MRI.
  • This method is crucial for accelerating fast three-dimensional MRI data acquisition.