1. A method for generating a planar medical image of a portion of the human anatomy, comprising the steps of: providing a computer having a 3-D stored image of said portion of the human anatomy, creating a first image slice of the 3-D stored image at a first image orientation and depth in a defined direction and defining a first point in the first slice, creating a second image slice of the 3-D stored image at a second image orientation and depth in said defined direction and defining a second point in the second slice, creating a third image slice of the 3-D stored image at a third image orientation and depth in said defined direction and defining a third point in the third slice; calculating a plane in the 3-D stored image described by the three points, creating a fourth image slice of said 3-D stored image as said planar medical image from said calculated plane, and wherein the steps of creating the first image slice, the second image slice, the third image slice, the fourth image slice and calculating a plane are performed using said computer.