MRI bias field estimation based on diffusion

Aim at magnetic resonance imaging (MRI) inherent bias field, a new method to estimate image bias field based on diffusion was proposed, which was based on an intuitive assumption that the true bias field can be evolved and approximated by image surface. To constrain this evolution, an energy function was designed based on two diffusion constraints. One was that the bias-free image has concise representation with image gradients. The other constraint was that the model fit on the bias field which was more relaxed than previous methods. Experimental results show that this method can estimate adaptively and correct effectively magnetic resonance imaging bias field, and compared with other methods, this model was more simple, but this effect was better.