A comparison between standard anisotropic diffusion and morphological diffusion. A user wants to extract the eye muscle motor neurons from a zebrafish head dataset. The same selection brush stroke from this viewing angle is applied for both methods. However, morphological diffusion can extract the result with fewer iterations and less time. All arrowheads point to regions where details are better extracted with our method. The magenta arrowhead indicates part of the eye motor neuron being extracted, which was originally occluded behind the tectum. Timings are measured on a PC with an Intel i7 975 3.33GHz processor, 12GB memory, an AMD Radeon HD4870 graphics card with 1GB graphics memory, and Microsoft Windows 7 64-bit.