With the improvement 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 will discuss this issue from both theoretical and theoretical perspectives.

Imaging principle of X-ray tube production:

The reason why a film can form an image of the human body on a fluorescent screen or film 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 tissues and structures in the human body, the level at which they are absorbed varies, so the amount of X-rays reaching the fluorescent screen or X-ray film is different.

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 fundamental 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 the X-ray images produced by X-ray tubes with black-and-white contrast and gradation 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 a black-and-white contrast X-ray image.

When X-rays penetrate tissues or organs of different thicknesses, thicker local areas absorb more X-rays while thinner ones absorb less. Therefore, the remaining amount of X-rays varies. In fact, the two elements of density and thickness often comprehensively affect X-ray imaging.

2. The influence of tube parameters on imaging

The indicators that affect the X-ray imaging quality of X-ray tube production are generally mainly measured by two indicators: spatial resolution and density resolution. Besides the reasons related to the equipment, the parameters and performance of the tube also have a significant impact on these two parameters. Below, we will analyze the X-ray imaging quality from the perspective of the tube respectively.