Distance between faces created by isosurface command

I am looking to use the isosurface function to find surfaces of equal intensity in 3D CT data. However, due to my application I need the distances between the centers of the faces of the surface to be less than a certain value. How does the isosurface command determine the size of triangles it uses to create the surfaces? Do we have any control over that parameter? The help file is silent on this matter.

[Petr Smirnov]

If it matters, the Matlab version is R2013a.