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FID-acquired-echos (FAcE): a short echo time imaging method for flow artefact suppression
M B Scheidegger1, S E Maier, P Boesiger
1Institute of Biomedical Engineering and Medical Informatics, University of Zurich, Switzerland.
Magnetic Resonance Imaging
|January 1, 1991
Summary
The novel FID-Acquired-Echo (FAcE) sequence in MRI significantly reduces echo times, minimizing motion artifacts for clearer, high-resolution imaging, especially for blood flow quantitation.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Physics
Background:
- Conventional MRI techniques face challenges with motion-induced artifacts, particularly in dynamic processes like blood flow.
- Short echo times are crucial for reducing signal dephasing caused by motion and improving image quality.
Purpose of the Study:
- To introduce and evaluate the FID-Acquired-Echo (FAcE) sequence for improved MRI.
- To assess FAcE's ability to reduce echo times and motion artifacts.
- To explore FAcE's utility in quantitative blood flow imaging.
Main Methods:
- Implementation of the FAcE sequence on a commercial 1.5 Tesla MRI system.
- Utilizing fractional-echo acquisitions with separate sampling of k-space half-planes.
- Acquisition of high-resolution images with short echo times (3-4.5 msec).
Main Results:
- FAcE reduces minimal echo times by approximately 50% compared to conventional methods.
- Short echo times minimize signal dephasing from velocity and spin motion.
- The sequence offers partial compensation for motion-induced phase shifts, reducing artifacts.
Conclusions:
- FAcE provides an alternative to flow-compensating gradients for motion artifact reduction.
- The sequence is beneficial for imaging tissues with short T2 relaxation times and in-flow angiography.
- FAcE is particularly advantageous for triggered-phase contrast imaging and quantitation of irregular blood flow patterns.