Another introduction: Medical Imaging, Medical Imaging, is the study of the human body with the help of some media (such as X-rays, electromagnetic fields, ultrasound, etc.) and the interaction of the human body, the human body's internal tissues and organs structure, the density of the image to show for the diagnostic physician to diagnose the information provided by the image to judge, and thus the evaluation of the human body's state of health of a scientific discipline, including Medical imaging system and medical image processing two relatively independent research direction. Medical imaging, also known as silver halide imaging, because the former film (film) is a light-sensitive material with silver halide chemical photosensitive imaging.