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Echo-planar imaging with asymmetric gradient modulation and inner-volume excitation
D A Feinberg1, R Turner, P D Jakab
1Harvard Medical School, Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts 02115.
Magnetic Resonance in Medicine
|January 1, 1990
Summary
This study presents a new echo-planar imaging technique to reduce artifacts. The method improves image quality and allows imaging with less optimal hardware, enhancing diagnostic capabilities.
Area of Science:
- Magnetic Resonance Imaging
- Image Reconstruction
- Medical Physics
Background:
- Single-shot echo-planar imaging (SS-EPI) is susceptible to artifacts from echo time reversal and magnetic field inhomogeneity.
- These artifacts limit image quality and complicate interpretation in clinical settings.
- Existing methods struggle with systems having suboptimal gradient performance.
Purpose of the Study:
- To introduce a novel technique to overcome SS-EPI artifacts.
- To enable robust imaging even with imperfect gradient hardware.
- To present advanced imaging capabilities including sectional and 3D volume imaging.
Main Methods:
- A new SS-EPI acquisition strategy using consistent gradient polarity.
- Implementation of a phase-correction method for Hermitian symmetry.
- Application to "half-Fourier" reconstruction for improved efficiency.
Main Results:
- Significant reduction in image artifacts compared to conventional SS-EPI.
- Successful demonstration of sectional and 3D volume imaging.
- Effective correction of phase errors for enhanced image fidelity.
Conclusions:
- The presented technique effectively mitigates SS-EPI artifacts.
- This method broadens the applicability of SS-EPI to a wider range of MRI systems.
- The technique offers improved image quality and advanced imaging possibilities.