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Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
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A correction method for streak artifacts in gradient-echo EPI using spin-echo EPI reference data.

Jun-Young Chung1, Yeji Han, Zang-Hee Cho

  • 1Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon, Republic of Korea.

Magma (New York, N.Y.)
|November 11, 2011
PubMed
Summary
This summary is machine-generated.

Streak artifacts in gradient-echo echo planar imaging (GE-EPI) were analyzed. A new correction method using SE-EPI reference scans effectively eliminates Nyquist ghost artifacts without introducing new streak artifacts.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Processing

Background:

  • Streak artifacts and Nyquist ghost artifacts are common issues in gradient-echo echo planar imaging (GE-EPI).
  • These artifacts can degrade image quality and complicate analysis, particularly in high-field MRI systems.

Purpose of the Study:

  • To analyze the nature of streak artifacts in GE-EPI sequences.
  • To develop and validate a correction method for Nyquist ghost artifacts that avoids generating streak artifacts.

Main Methods:

  • Experiments were conducted using GE-EPI and SE-EPI (spin-echo EPI) sequences with various reference scans.
  • Spin dephasing phenomena in GE-EPI reference scans were investigated.
  • A novel correction method utilizing SE-EPI reference data for GE-EPI main scan data was developed.

Main Results:

  • Improving reference data via signal averaging or large flip angles did not fully correct streak artifacts if noise persisted.
  • Main field inhomogeneity caused spin dephasing in GE-EPI reference data.
  • The proposed SE-EPI reference scan method successfully eliminated N/2 ghost artifacts without introducing streak artifacts.

Conclusions:

  • The proposed phase error correction scheme enhances EPI performance in high-field MRI.
  • This method is particularly beneficial in environments with significant magnetic field inhomogeneities.