1. A method for spine visualization in a 3D image volume comprising: receiving an input 3D image volume; determining a spinal cord centerline in said input 3D image volume using a fully automatic spinal cord tracing based method that fits an annulus model having an inner radius and an outer radius to high contrast portions in spinal canal regions of slices of the 3D image volume based on a contrast score calculated using a difference between average image data between the inner radius and the outer radius and average image inside the inner radius, and smoothes a trajectory of said spinal cord centerline; and generating a reformatted image volume from said input 3D image volume based on said spinal cord centerline.