hi experts , i have two questions and hope you can help me.
1- i was able to form a 3d image of a brain from a 2d slices. but i want to set all the gray level values out side the brain to zero (i.e eliminate the noise at the background)
2- A(x,y,z) is a point within the 3 D volume , it could be within the brain or outside the brain. i wish to find the nearest point to A(x,y,z) on the surface of the brain.