With the advancement and development of CT equipment, the correct application of CT, reducing the wear and tear of tubes, and lowering operating costs are issues of concern to every CT staff member in hospitals. The following article discusses this issue from both theoretical and theoretical perspectives. CT tube

I. Principles of X-ray Imaging

The reason why X-rays can form images of the human body on fluorescent screens or films is, on the one hand, based on the characteristics of X-rays, namely their penetrating power, fluorescence effect and photographic effect. On the other hand, it is based on the differences in density and thickness of human tissues. Due to this difference, when X-rays pass through various tissue structures in the human body, the degree to which they are absorbed varies, so the amount of X-rays reaching the fluorescent screen or X-ray film is different. CT tube

In this way, images with different black-and-white contrasts are formed on the fluorescent screen or X-ray film.

Therefore, the composition of X-ray images should meet the following three basic conditions: Firstly, X-rays should have a certain penetrating power so as to penetrate the tissue structure being reflected. Secondly, the tissue structure being penetrated must have differences in density and thickness, so that the amount of X-rays remaining after absorption during the penetration process will be different. Thirdly, the remaining X-rays with differences are still invisible and must go through the imaging process. For instance, they can be developed through X-ray photos or image intensifiers, or collected using A detector matrix method. After A/D analog-to-digital conversion, they form digital images and can be displayed on a projector or printed onto various media using different printers. Only in this way can X-ray images with black and white contrast and layers be displayed.

        When X-rays penetrate tissues of different densities, the tissues with higher density are absorbed more, while those with lower density are absorbed less. As a result, the remaining amount of X-rays varies, thus forming black-and-white contrast X-ray images. CT tube