X-ray tube is needed for the generation of X-rays. The basic structure of X-ray tube must include cathode filament, anode target, vacuum glass shell and, of course, power supply. The characteristics of X-rays can penetrate objects as invisible light, and the linear scattering of light in a wide wavelength range in the electromagnetic spectrum can make fluorescent substances emit light and make the negative film sensitive, which will cause scattering lines. When X-rays enter an object, there will be three situations: four factors that are absorbed, scattered and penetrated by the object and affect the image effect: density -mAs contrast -kVp sharpness-motion, geometric parameter distortion-position, angle, X-ray wavelength and contrast on the film. When X-ray penetrates a patient, its penetration rate is mainly related to the patient's tissue structure and X-ray wavelength. Short-wavelength X-ray (high kV) has high energy and good penetration, which leads to low film contrast. Long-wavelength X-ray (low kV) has low energy, easy absorption by human body, poor penetration and high contrast in movies. X-ray machines are widely used in various fields of medical care, science education and industry. For example, X-ray machines can be used in hospitals to help doctors diagnose diseases, for industrial nondestructive testing, and for safety inspection of railway stations and airports. Portable x-ray machine
The function of large X-ray machine
High-frequency inverter technology can realize low-dose exposure of high-definition images, high-power, high-kV, large-mA load output can meet the needs of whole-body photography, short-time transient exposure can eliminate motion artifacts and easily capture image information, APR function can easily select the photographic conditions of different anatomical parts, and AEC function of ionization chamber can be selected to realize automatic control of photographic exposure. Stable radiation output with high slope and low ripple output voltage can realize high power, high kV and short time photography, which can effectively reduce the imaging blur caused by organ peristalsis in vivo and greatly improve the imaging quality. High-quality X-ray has high DC component and short imaging time; The exposure accuracy is high, the imaging repeatability is good, and clear clinical images and rich diagnostic information can be obtained with the minimum dose. Effectively reduce radiation damage, greatly reduce stray rays, and reduce the radiation intensity of subjects and operators. Under the same irradiation conditions, the skin dose is reduced by 60% compared with the power frequency machine. It has the advantages of high degree of automation of computer control, expanded automatic control function, more convenient operation and strong system expansion and upgrading ability. Compared with the traditional power frequency generator, it has smaller volume, higher efficiency and less invalid rays.
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