Before revision:  In this paper, we extract volumes representing the gray and white matter of the brain from Magnetic Resonance Imaging (MRI) data and automatically generate the optimal arterial tree using simulated annealing .
After revision:  In this paper, we extract volumes representing the gray and white matter within a healthy human brain was first segmented from Magnetic Resonance Imaging (MRI) data and automatically generate the optimal arterial tree using simulated annealing .