[Insight-users] Why when I use "Gradient Anisotropic Diffusion" and input a time step "0.25" the program shows me a warning that the time step minmum for the image is 0.125?

[Godspeed Dash]

Why when I use "Gradient Anisotropic Diffusion" and input a time step "0.25"
the program shows me a warning that the time step minimum for the image is
0.125? 

PS: I am processing a 2D CT DICOM image, anyone could lend me a hand?

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