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NMR angiography with enhanced quasi-half-echo scanning
Q Guo1, G Kashmar, O Nalcioglu
1Department of Radiological Sciences, University of California, Irvine 92717.
Magnetic Resonance Imaging
|January 1, 1991
Summary
This study introduces a novel flow-insensitive pulse sequence combining gradient quasi-half-echo signals and moment-nulling to reduce NMR image dephasing. This method enhances blood vessel visualization in gradient echo subtraction angiography.
Area of Science:
- Medical Imaging
- Nuclear Magnetic Resonance (NMR)
Background:
- Flow dephasing significantly impacts NMR image quality.
- Gradient quasi-half-echo signals and moment-nulling are known techniques to mitigate flow artifacts.
Purpose of the Study:
- To develop an efficient, flow-insensitive imaging pulse sequence.
- To combine gradient quasi-half-echo and moment-nulling techniques.
- To reduce dephasing in gradient echo subtraction angiography for enhanced blood vessel imaging.
Main Methods:
- Development of a novel flow-insensitive enhanced quasi-half-echo pulse sequence.
- Application of the pulse sequence in gradient echo subtraction angiography.
- Utilizing both phase-corrected and uncorrected quasi-half-echo reconstruction techniques.
Main Results:
- The developed pulse sequence effectively reduces flow dephasing effects.
- Demonstrated improved blood vessel enhancement in angiography.
- Evaluated the impact of reconstruction techniques on image resolution and vessel enhancement.
Conclusions:
- The combined approach offers an efficient method for reducing dephasing in NMR imaging.
- This technique is valuable for enhancing visualization of blood vessels.
- Further analysis confirmed the benefits of phase correction in quasi-half-echo reconstruction.