To investigate B0 fluctuation in the head induced by respiration in high field MRI, we simulated respiration with a human 4D phantom model, and calculated B0 in the brain by an efficient calculation algorithm. Simulated B0 was analyzed for the spatiotemporal distribution and voxel size dependence. The amplitude of dynamic B0 change exhibited strong inferior/superior gradient and significant anterior/posterior gradient, consistent with previous experimental data. Compared to the previous modeling studies, our simulation can yield more reliable, high-resolution results within a relatively short calculation time.
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