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Proton chemical-shift imaging with magnetically and electrically inhomogeneous objects
T Nozokido1, E Yamamoto, H Kohno
1Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan.
Magnetic Resonance in Medicine
|May 1, 1991
Summary
This study presents a novel method for artifact-free proton chemical-shift imaging. It effectively removes artifacts from magnetic field variations and radiofrequency field properties, enabling clear water/fat separation images without complex processing.
Area of Science:
- Medical Imaging
- Biophysics
- Magnetic Resonance Imaging
Background:
- Magnetic Resonance Imaging (MRI) is susceptible to artifacts.
- Artifacts arise from magnetic field inhomogeneities, object susceptibility, and radiofrequency (RF) field properties.
- These artifacts complicate accurate water/fat separation in chemical-shift imaging.
Purpose of the Study:
- To develop a method for eliminating artifacts in proton chemical-shift imaging.
- To enable artifact-free water/fat separation.
- To address artifacts caused by magnetic field inhomogeneities, susceptibility, and RF field properties, particularly in high-tesla systems.
Main Methods:
- Proton chemical-shift imaging technique is presented.
- Artifacts from main magnetic field inhomogeneities, susceptibility distributions, and RF field properties are addressed.
- Experimental demonstration of artifact reduction related to conductivity distributions in high-tesla imaging.
Main Results:
- Reconstruction of artifact-free water/fat separation images is achieved.
- Simple image data manipulations are used, avoiding complex phase-unwrapping processes.
- The method is effective even with significant main magnetic field inhomogeneities.
Conclusions:
- The proposed method offers robust artifact elimination in proton chemical-shift imaging.
- It simplifies image reconstruction for water/fat separation.
- This advancement is particularly relevant for high-tesla MRI applications.