In 1895, the discovery of X-rays by German physicist Wilm Conrad Leng Jean led to the emergence of new diagnostic tools used by physicians. He discovered that X-rays were made by La Selle Renoz The X-ray machine a few months later. This is one of the oldest X-ray machines in the world, allowing humans to watch inside the body without cutting.
A Brief history of development
Since 1895, X-ray diagnosis and treatment technology has developed rapidly, the main progress can be divided into the following stages:
(i) ion X-ray tube phase (1895~1912)
This is the early phase of the X-ray device. At that time, the structure of the X-ray machine is very simple, using a very low efficiency of the gas-cooled cathode ion X-ray tube, the use of heavy induction coil high pressure, bare-type high-pressure parts, there is no precise control device. X-ray machine device small capacity, low efficiency, weak penetration, image clarity is not high, lack of protection 0 according to data records, then photographed an X-ray pelvic image, need to 40~60min exposure time, the results after the photo, the client's skin was X-ray Burns.
(ii) Electronic X-ray tube phase (1913~1928)
With the development of electromagnetism, high vacuum technology and other disciplines, 1910 American physicist W. D． Coolidge published a successful report on the manufacture of tungsten filament X-ray tubes. 1913 began to be used in practice, its biggest feature is the tungsten filament heating to the incandescent state to provide the tube current required for the electronic, so adjust the heating temperature of the filament can control the tube current, so that the tube voltage and tube current can be independently adjusted, which is to improve the image quality required.
The invention of the 1913 filter grille partially eliminates the scattering line and enhances the quality of the image. The application of X-ray Fluoroscopy was started in 1914 when the cadmium tungstate fluorescent screen was prepared. A dual focus X-ray tube was invented in 1923 to address the need for X-ray photography. X-ray tube power up to thousands of watts, rectangular focus of length only a few millimeters, X-ray image quality greatly improved. At the same time, the gradual application of contrast agent, so that the diagnosis of X-ray has been expanding. It is no longer a simple tool for capturing bone images, but it has become an important medical diagnostic facility for the gastrointestinal tract, bronchi, blood vessels, ventricles, kidneys, and bladders that are also examined in the human tissues and organs. At the same time, X-rays are beginning to be used in treatment.