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3D prewitt operator

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ilke tunali
ilke tunali on 1 Sep 2015
Edited: ilke tunali on 1 Sep 2015
Hello,
I'm trying to find the gradient of an 3D CT image. I need the magnitudes and the angles.
I was thinking of the prewitt operator but I couldn't find its mask for 3D images.
Can I use a operator like this?
h = zeros (3,3,3);
h(:,:,1)=[0 0 0; -1 -1 -1;0 0 0 ];
h(:,:,3)=[0 0 0; 1 1 1;0 0 0 ];
Grad = imfilter(Image,h,'replicate');
It gives something relevant but I don't know if I'm doing it right.
Thanks for the help.

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