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Currently hemodynamic-based functional MRI technique is of limitation in temporal resolution.As neural activities in the brain accompany with current induced neuronal magnetic fields (NMF),it is possible to utilize MRI to detect NMF directly thus to improve the temporal resolution.In this work,the contribution of dendrite branch to NMF is investigated by numeric simulation.The results indicate that the existence of dendrite branch may enhance the detectability of NMF by MRI directly.