Imaging technological study of bone change

骨结构基本上由骨膜、骨皮质和髓腔组成。形成髓腔的松质骨在X线片上显示为线状或网状骨小梁。骨组织是一种经过反复吸收和形成的代谢组织。特别是，松质骨的矿物质含量波动密切响应骨代谢的变化。一般来说，当骨脱矿或过度矿化超过30%至40%时，可以通过常规X线摄影检测到异常的骨丢失和钙化。采用全景断层扫描，这是一种相对标准化的程序，因为它操作简单，可以评估整个下颌骨。由于断层图像的模糊性，传统的全景断层图像不适合于下颌骨骨小梁模式的视觉分析。这个问题是通过使用激光扫描系统，它可视化的骨小梁相当清楚，并允许相对准确的分类模式上产生的images.In此外，我们能够定量和定性评估的X射线能量的分布与信息的骨小梁的数字化成像板上使用的物理过程。

The bone structure consists basically of the periosteum, bone cortex and intramedullary cavity. The cancellous bone forming the intramedullary cavity is visualized as a linear or reticular pattern of bone trabeculae on the radiographic images. The bone tissue is a metabolic one that undergoes repeated resorption and formation. In paticular, the mineral content of the cancellous bone fluctuates in close response to changes in bone metabolism. Generally it has been said that bone loss and calcification of abonomalities can be detected by conventional Radiography when the bone demineralization or hypermineralization is more than 30 to 40 percent.Panoramic tomography, a procedure which is relatively standardized, was employed because it is simple to manipulate and allows evaluation of the entire mandible. Because of the blurred images specific to tomographs, conventional panoramic tomographs are not suitable for the visual analysis of patterns of the mandibular bone trabeculae. This problem was overcome by using a laser scan system, which visualized the trabeculae quite clearly and allowed relatively accurate classification of the patterns on the image produced.In addition, we were able to evaluate quantitatively and qualitatively the distribution of x-ray energy in relation to information on the bone trabeculae on the digitalized imaging plate using a physical procedure.