Medical image segmentation is essential in medical image processing. It can help doctors see the pathological sites clearly and make accurate disease diagnosis and effective treatment. A doctor may not observe potential the disease visually but they may find it through checking the intensity changes from medical images and its boundaries through careful manual segmentation or separation. With rapid development of image segmentation, more accurate and automatic segmentation algorithm have appeared for various human organs and their movements. Medical image segmentation algorithms are more accurate and faster than human free hand segmentation.