Design For Spin-Double-Echo Sequence And Imaging Techology Based On Magnetic Resonance

Magnetic Resonance Imaging technology is one of the most important tools for the clinic medicine diagnosis now. The sequence design and image rebuilding technology have direct relation to the imaging quality, and have an influence on doctor's diagnosis for the state of an illness. Therefore, the study of MRI sequence and imaging technology is very important, which has a great research value.The text firstly introduces the national and foreign researching state. After that, expatiating on the basic principle of MRI gets ready for the research on the sequence design and image rebuilding. Then, based on the parallel rebuilding principle, the SENSitivity Encoding is applied to the data collection and imaging. To solve the problem of signal-to-noise reducing and the data's dependability, we bring in the anisotropic diffusion filtering and robust estimation arithmetic.The task's research key is spin-double-echo sequence design and its image rebuilding technology. The first echo shows proton density weighted image, and the second one is T2 weighted image, which have different contrast. How to fill the k space is the key and foundation to the sequence design. Aiming at the engineering instance, many detail technologies are added into the sequence, cooperated with exact parameter calculation, in order to get the best image in best times.Image rebuilding is based upon Fourier imaging. Because diversified artifacts are not avoided in the data collection, such as midsplit bright line, motion, eddy current artifact, and so on. To improve the image's quality, we make some improvements to sequence and rebuilding technique, which eliminate the artifacts'effect.