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Related Experiment Videos

Reduction of phase error ghosting artifacts in thin slice fast spin-echo imaging

X Wan1, D L Parker, J N Lee

  • 1Department of Radiology, University of Utah, Salt Lake City 84132, USA.

Magnetic Resonance in Medicine
|October 1, 1995
PubMed
Summary
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Fast spin-echo (FSE) imaging is prone to ghosting artifacts due to phase shifts between radiofrequency pulses. This study introduces a correction technique that significantly reduces these artifacts in FSE images.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics

Background:

  • Fast spin-echo (FSE) techniques are sensitive to phase variations between excitation and refocusing radiofrequency (RF) pulses.
  • Phase shifts can lead to signal splitting and ghosting artifacts in reconstructed images.

Purpose of the Study:

  • To investigate the cause and nature of ghosting artifacts in FSE imaging.
  • To develop and validate a method for correcting phase-related ghosting in FSE images.

Main Methods:

  • A phase shift was intentionally introduced between excitation and refocusing RF pulses.
  • The resulting signal components and their impact on image reconstruction were analyzed.
  • A correction technique was developed using measurements from a single echo train without phase encoding gradients.

Related Experiment Videos

Main Results:

  • Ghosting artifacts were observed and demonstrated to be object-dependent.
  • The proposed correction technique effectively reduced ghosting artifacts.
  • Successful reduction of ghosting was shown in both phantom and human studies.

Conclusions:

  • Phase shifts in FSE imaging are a primary cause of ghosting artifacts.
  • The presented correction method offers a viable solution for improving FSE image quality, particularly in thin slice applications.