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3-D FLASH imaging using a single surface coil and a new adiabatic pulse, BIR-4
R S Staewen1, A J Johnson, B D Ross
1Department of Radiology, University of Minnesota, Minneapolis.
Investigative Radiology
|May 1, 1990
Summary
A novel adiabatic pulse enables uniform flip angles in 3D fast imaging, even with magnetic field (B1) inhomogeneities. This technique improves T1-weighted imaging using a single surface coil for transmission and detection.
Area of Science:
- Magnetic Resonance Imaging
- Pulse Sequence Design
Background:
- Transmitter coil magnetic field (B1) inhomogeneities can degrade image quality in Magnetic Resonance Imaging (MRI).
- Achieving uniform flip angles is crucial for accurate T1-weighted imaging.
- Surface coils offer advantages in signal detection but can exacerbate B1 field variations.
Purpose of the Study:
- To introduce and evaluate a new adiabatic pulse for 3D fast MRI.
- To demonstrate the pulse's ability to achieve uniform flip angles despite B1 inhomogeneities.
- To assess the utility of this pulse for T1-weighted imaging with a single surface coil.
Main Methods:
- Development of a novel adiabatic pulse sequence.
- Computer simulations to model pulse performance.
- Phantom, rat, and human imaging experiments using a single surface coil for transmission and detection.
Main Results:
- The adiabatic pulse successfully induced uniform and arbitrary flip angles.
- Consistent image quality was achieved despite significant B1 field inhomogeneities.
- Effective T1-weighted imaging was demonstrated in various experimental setups.
Conclusions:
- The new adiabatic pulse is effective for 3D fast MRI with surface coils.
- It overcomes challenges posed by B1 inhomogeneities, enabling robust T1-weighted imaging.
- This technique holds promise for improving MRI acquisition in challenging scenarios.