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Nonaxial whole-body instant imaging
R M Weisskoff1, M S Cohen, R R Rzedzian
1Massachusetts General Hospital, Department of Radiology, Charlestown 02129.
Magnetic Resonance in Medicine
|June 1, 1993
Summary
Whole-body, single-shot imaging enables practical visualization beyond central planes, including oblique axes for cardiac and brain imaging. High magnetic fields can reduce imaging artifacts like distortion and ghosting.
Area of Science:
- Medical Imaging
- Magnetic Resonance Imaging (MRI)
Background:
- Single-shot imaging techniques are crucial for reducing motion artifacts.
- Imaging beyond the central plane presents challenges in maintaining image quality.
Purpose of the Study:
- To demonstrate the feasibility of whole-body, single-shot imaging for off-central plane visualization.
- To investigate image artifacts and their mitigation strategies in this technique.
Main Methods:
- Utilized whole-body, single-shot imaging to acquire cardiac and brain images.
- Analyzed image distortions and ghosting artifacts caused by secondary gradients.
- Investigated the effect of high magnetic fields on artifact reduction.
Main Results:
- Successfully acquired images of the heart (cardiac long- and short-axis) and brain (coronal views) using single-shot imaging.
- Identified secondary gradients as a source of predictable image distortion and ghosting, consistent with Maxwell's equations.
- Demonstrated that higher magnetic fields generally reduce these imaging artifacts.
Conclusions:
- Whole-body, single-shot imaging is a practical method for acquiring images outside the central plane.
- Understanding and mitigating gradient-induced artifacts is essential for robust off-central plane imaging.
- High magnetic field strength is beneficial for minimizing artifacts in echo planar imaging.