Accurate dynamic magnetic field monitoring and diffusion-weighted image reconstruction using uncorrelated local field measurements
Ying-Hua Chu1, Yi-Cheng Hsu1, and Fa-Hsuan Lin1,2
1Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, 2Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
We proposed a method to decouple field probes and to improve the accuracy of dynamic magnetic field estimation. A sensitivity matrix of probes was measured and to decouple NMR signals. Diffusion weighted phantom images with off-resonance characterized by decoupled probes had a more invariant structure than by coupled probes when diffusion sensitivity gradients along different directions were applied. The phantom image reconstructed with field disturbances estimated from decoupled probes also shows a more homogeneous background than from coupled probes. Human brain images also demonstrated the improved image quality when decoupled probes were used.
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