科研之友
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摘要
The chemical shift artifact in magnetic resonance imaging is an undesirable misregistration of components of an image due to their chemical shift differences. The artifact is most prevalent at high magnetic fields with small field gradients and low sampling rates. Exploiting this relationship allows the acquisition of spectral information for each and every voxel of a magnetic resonance image, which in turn provides the opportunity for multispectral diagnosis and analysis approaches. A method of transforming a set of images with different amounts of the chemical shift artifact into a spatial-spatial-spectral image is presented. The transformation is demonstrated on tomographic magnetic resonance images of a chemical shift phantom and the human leg. As with all spectral imaging techniques, this one is also sensitive to magnetic susceptibility variations across the field of view. The technique can readily separate water and lipid and has a spectral resolution approaching 0.4 ppm.
- 出版日期2011-5
