DIXON with Virtual Shimming provides a fast and accurate fat suppression imaging and water-fat quantitative analysis technology for clinical diagnosis. With the upgraded traditional DIXON technology, four types of images can be obtained: water, fat, in-phase, and opposed-phase, using new dual echo imaging technology to acquire water and fat in- and opposed-phase images. Virtual Shimming not only shortens the clinical image acquisition time but also achieves accurate fat suppression imaging, further improving the lesion detection rate and extending the clinical application of this technology.
DIXON with Virtual Shimming can achieve accurate fat suppression on water phase images, effectively improve tissue contrast, eliminate fat signal interference with lesions, especially differentiation of tissues with lipid-containing lesions, as well as diagnosis and analysis of challenging anatomical parts such as the skull, bone joints, etc.
Working Principle
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By using an iterative algorithm of intelligent error correction, the phase correction technology accurately estimates the phase error of water and fat under the non-uniform main magnetic field at each pixel point. In actual scanning, an advanced acquisition method with dual echo and a water-fat phase difference of α is used, which is more efficient and more stable than water-fat separation algorithm. The water and fat of a pixel are accurately quantified. The technology is named Virtual Shimming since the phase error correction is similar to the shimming process in pre-scanning.
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Obtain the initial value of phase error through I0 and I1 → Intelligent error correction → Virtual Shimming → Water-fat separation image
