Characterization of angle – dependent Focal spot in a miniature X-ray tube

Miniature x-ray tube can be used to obtain important images easily due to its small size and movability. Because the miniature x-ray tube discussed in this paper is a transmission type, it can emit x-rays in all directions, making it possible to take angle-dependent images. Focal spot is essential in an x-ray tube because it affects the quality of images taken by the x-ray tube. The size of the focal spot is equivalent to that of the x-ray generation region located at the x-ray tube target. If the size of focal spot is too large, images produced will be blurry. In other words, smaller focal spots produce clearer images. Currently common x-ray tubes have a relatively thick target, causing them to emit x-rays in one direction with uniform focal spot size. This type of x-ray produced is called reflection x-ray. However, unlike the conventional, miniature x-ray tubes, that this paper focuses on, have thin beryllium targets, allowing for both reflection x-ray and transmission x-ray to be generated at the targets. And since both types can affect the size of focal spots, these miniature x-ray tubes can emit x-rays, which is a crucial property when taking angle-dependent images. By measuring the physical characteristics of the focal spots, methods of improving the qualities of angle-dependent images can be determined. Thus, this experiment, which deals with measuring these physical characteristics will substantially help in the improvement of the qualities of angle-dependent images. The result was obtained by analyzing the image with procedure provided by EN-12543-5 Focal spots increase with increase in angle from 0 degree to 90 degrees