The Imaging Analysis and Calibration of Digital X-ray Image
数字X射线图象的成象分析及校正

The generation of a digital X ray image is such a complex process which includes the production, the conversion and the transform of the X ray information. Generally, the interactions between X ray and other material include photoelectric absorption and comptom scattering, which have relations to the material's mass, density, equivalently atomic weight and the energy of X ray. In clinical use, X ray has a wide spectrum similar to the daylight, so its intensity will become harder and harder with different rate during it penetrates other material. Such nonlinearity and other stochastic noise will make a digital X ray image has no exact physical means. Due to the physical comparability, we use aluminium and lucite to simulate bone and software respectively, and image them under each kind of material thickness, then we can obtain an ideal image model use part of these data, which can be used to calibrate and linearize the X ray image. This method will be advantageous to the quantitative analysis of the human's physiological parameters such as the cardiac configuration, the blood flow, and the density of the contrast media in DSA.