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New approach for correcting distortions in echo planar imaging
Huairen Zeng1, J Christopher Gatenby, Yansong Zhao
1Vanderbilt University Institute of Imaging Science, Nashville, Tennessee 37232-2657, USA. huairen.zeng@vanderbilt.edu
Magnetic Resonance in Medicine
|November 25, 2004
Summary
A novel technique corrects echo planar imaging distortions from off-resonance effects. This method is effective, requires fewer scans than previous approaches, and avoids complex phase unwrapping for clearer imaging.
Area of Science:
- Magnetic Resonance Imaging
- Image Processing
Background:
- Echo planar imaging (EPI) is susceptible to distortions caused by B(0) field inhomogeneities, eddy currents, and gradient imperfections.
- Existing methods for correcting these distortions, such as field mapping, can be complex and time-consuming.
Purpose of the Study:
- To introduce and validate a new method for correcting multiple off-resonance effects in EPI.
- To offer an alternative to existing distortion correction techniques that is more efficient and simpler to implement.
Main Methods:
- A novel phase-encoded acquisition method was developed to directly address distortions in distorted space.
- The technique was tested using phantoms and human head scans at 3.0 Tesla.
Main Results:
- The new method effectively corrects distortions in both spin echo EPI and gradient echo EPI.
- It demonstrates comparable efficacy to the Chen and Wyricz method but requires fewer scans.
- The approach bypasses the need for phase unwrapping, simplifying the correction process.
Conclusions:
- The described method provides an efficient and robust solution for correcting EPI distortions.
- This technique has the potential to improve the quality and reliability of EPI data in various applications.