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Double-sampled echo-planar imaging at 3 tesla
Q X Yang1, S Posse, D Le Bihan
1Department of Radiology (Center for NMR Research), Pennsylvania State University, College of Medicine, Milton S. Hershey Medical Center, Hershey 17033, USA.
Journal of Magnetic Resonance. Series B
|November 1, 1996
Summary
The double-sampled echo-planar imaging (DSEPI) method effectively eliminates the Nyquist ghost artifact in MRI scans. This technique restores signal-to-noise ratio (SNR) loss, improving image quality for brain imaging.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Physics
- Neuroimaging
Background:
- Echo-planar imaging (EPI) is susceptible to the Nyquist ghost artifact.
- This artifact arises from time-reversal asymmetry in even and odd echoes.
- The Nyquist ghost degrades image quality and reduces signal-to-noise ratio (SNR).
Purpose of the Study:
- To present a novel method for eliminating the Nyquist ghost artifact in EPI.
- To restore the signal-to-noise ratio (SNR) lost due to this artifact.
- To validate the effectiveness of the proposed method in human brain imaging.
Main Methods:
- Introduction of the double-sampled EPI (DSEPI) technique.
- Equal phase encoding of even and odd echo pairs.
- Separate reconstruction and addition of even and odd echo images.
Main Results:
- Successful elimination of the Nyquist ghost artifact.
- Restoration of image signal-to-noise ratio (SNR) loss.
- Demonstration of the method's efficacy in 3.0 T human brain scans.
Conclusions:
- DSEPI is a simple and effective solution for Nyquist ghost artifact.
- The method significantly improves image quality in EPI.
- DSEPI is a valuable technique for neuroimaging applications.