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Limited field of view spin echo MR imaging.
J B Weaver1, R D Harris, P K Spiegel
1Department of Radiology, Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire 03756.
Magnetic Resonance Imaging
|January 1, 1991
Summary
This study introduces a modified magnetic resonance imaging (MRI) technique enabling multislice imaging by angling excited slices. This innovation allows for faster scans or improved spatial resolution in MRI.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging Technology
Background:
- Traditional MRI methods with perpendicular excited slices limit imaging to a single slice per repetition time, hindering multislice capabilities.
- Existing techniques for limiting the field of view (FOV) restrict imaging to one slice at a time, preventing efficient multislice acquisition.
Purpose of the Study:
- To present a novel modification of MRI techniques for achieving multislice imaging.
- To enable flexible FOV centering and optimize imaging parameters for enhanced image quality.
Main Methods:
- Modified MRI pulse sequence where excited slices by 90 and 180-degree pulses are at a small angle.
- Implementation of a limited field of view (FOV) with adjustable centering.
- Characterization of optimal imaging conditions for specific FOV, slice thickness, and interslice gap.
Main Results:
- Successful demonstration of multislice imaging capability with the modified technique.
- The method allows for the center of the FOV to be offset to any desired position.
- Identified conditions for optimal image quality based on FOV, slice thickness, and interslice gap.
Conclusions:
- The developed MRI technique overcomes the limitations of previous FOV-limiting methods, enabling efficient multislice imaging.
- This advancement can reduce phase-encoding steps, leading to decreased imaging time.
- Alternatively, the technique can enhance spatial resolution without increasing overall scan duration.