Cartesian echo planar hybrid scanning with two to eight echoes
- 1 March 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Medical Imaging
- Vol. 10 (1) , 1-10
- https://doi.org/10.1109/42.75606
Abstract
A method of fast nuclear magnetic resonance (NMR) imaging which uses only square wave gradient shapes and also collects data on Cartesian coordinates in a way similar to the blipped echo planar imaging method (BEPI) is described. The method is a heuristic attempt at finding an optimal data collection strategy for NMR imaging. Its advantages and disadvantages compared to other methods are carefully analyzed. Clinical size anatomical (head and body) images are shown. It is found that the interecho phase-angle discrepancies that are caused bv the B(0) inhomogeneity and by the gradient wave form distortion can largely be eliminated by using the half Fourier method with full Fourier phase map correction, but one phase map is required for each echo. GRASS/FLASH spoiling techniques are incorporated into the method in order to allow multiecho speed increases for scans which would run under 10 s using a single-echo method. The technique can be applied directly to GRASS/FLASH itself, as is demonstrated by a two-echo GRASS scan. The fastest image was 1.9 s.Keywords
This publication has 23 references indexed in Scilit:
- REALTIME MR IMAGING USING ULTRA-SHORT TR ACQUISITION AND CUSTOM RECONSTRUCTION HARDWAREInvestigative Radiology, 1990
- Cartesian Sampling Of FID Data Using Oscillating GradientsPublished by SPIE-Intl Soc Optical Eng ,1988
- An improved echo planar reconstruction methodIEEE Transactions on Nuclear Science, 1988
- Square spiral fast chemical shift imagingMagnetic Resonance Imaging, 1987
- High-Speed Spiral-Scan Echo Planar NMR Imaging-IIEEE Transactions on Medical Imaging, 1986
- Reduction of MR imaging time by the hybrid fast-scan technique.Radiology, 1986
- Fast fourier imagingMagnetic Resonance in Medicine, 1985
- The National Radiological Protection Boardad hocAdvisory Group on Nuclear Magnetic Resonance Clinical ImagingThe British Journal of Radiology, 1983
- A simple graphical representation of fourier-based imaging methodsJournal of Magnetic Resonance (1969), 1983
- On the use of windows for harmonic analysis with the discrete Fourier transformProceedings of the IEEE, 1978