医学影像学(国外英文资料).doc

医学影像学(国外英文资料) questions. General 1. Describe the X-ray characteristics of the medicine X ray is an electromagnetic wave with penetrability, fluorescence effect, photographic effect and biological effect. Its penetrability and substance The density and thickness are related to the X-ray wavelength. The fluorescence effect is the basis of X-ray examination. The photographic effect is the basis of X-ray photography Off effects involve changes in human biology, and are the basis of radiation protection and radiation therapy. 2. The basic principle of X-ray imaging is briefly described On the one hand, X-ray based penetration, fluorescence effects, and photographic effects, on the other hand, are based on density of human tissue and Thickness difference. When X-ray passes through various tissues of the human body, it is absorbed to varying degrees, so that a screen or There is a difference in X ray on X - ray. Thus, different images of black and white contrast can be formed on a fluorescent screen or an X-ray film. Bone and joint system 1. To describe the X-ray findings of acute and chronic pyogenic osteomyelitis Pyogenic osteomyelitis is caused by Staphylococcus aureus entering the bone marrow. It is very good in children and adolescents, and the long bone metaphysis is good Hair. Early (within 2 weeks) may have the following soft tissue changes: 1. The muscle gap is obscure. Two. The dividing line between subcutaneous tissue and muscle There is no obvious change in bone mass. Bone changes were seen 2 weeks after the onset of the disease. Localized bone appeared in the cancellous bone of the epiphysis Loose。 Then form the most scattered irregular shape destruction area. Destroy edge blur. Later, the bone destruction zone may fuse And become a big destruction zone. And gradually extended to the backbone. May be accompanied by pathological fracture. Destruction of cortical bone leads to subperiosteal abscess And stimulate periosteum to cause periosteal hyperplasia. A ne