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Motion correction using the k-space phase difference of orthogonal acquisitions.
Edward Brian Welch1, Joel P Felmlee, Richard L Ehman
1MRI Research Laboratory, Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota 55905, USA.
Magnetic Resonance in Medicine
|July 12, 2002
Summary
This study introduces a new MRI technique to correct motion artifacts caused by object translation. By analyzing phase differences in k-space from images with swapped phase-encode directions, researchers can accurately determine and fix motion.
Area of Science:
- Medical Imaging
- Biophysics
- Image Processing
Background:
- Rigid body translations in MRI cause artifacts along the phase-encode (PE) direction in 2D imaging.
- These artifacts can obscure important diagnostic information.
Purpose of the Study:
- To develop a method for correcting in-plane translational motion artifacts in MRI.
- To validate the efficacy of the proposed technique using synthetic and in vivo data.
Main Methods:
- Acquiring two images with swapped phase-encode (PE) directions.
- Solving a system of linear equations derived from k-space phase differences to determine motion parameters.
- Utilizing the orthogonal k-space phase difference (ORKPHAD) technique.
Main Results:
- The ORKPHAD technique successfully determined motion parameters from phase differences.
- Significant improvement in image quality by correcting translation-induced artifacts was observed.
- The method demonstrated effectiveness on both synthetic and in vivo datasets.
Conclusions:
- The ORKPHAD technique provides a robust solution for correcting MRI motion artifacts without special pulse sequences.
- The method is theoretically generalizable to partial Fourier imaging and 3D acquisitions.
- This approach enhances the diagnostic utility of MRI by improving image fidelity.