X-ray photography (CR) refers to the interaction of X-rays with the human body with the help of X-rays, the human body's internal organ structure, density, tissue composition, and other information in the form of video representation, is the use of X-rays of the penetration of the human body's three-dimensional anatomical structure projected into a two-dimensional flat image of an imaging technology, the human body's three-dimensional anatomical structure of the human body. .
The physical properties of X-rays include penetration, ionization, fluorescence, heat, and interference, diffraction, reflection, and refraction. X-ray photography is mainly used in the penetration of X-rays. X-rays have a short wavelength and high energy, and when they are shone on a substance, only a part of them are absorbed by the substance, and most of them are transmitted through the atomic gaps, which shows a strong penetration ability. X-rays penetrate the substance with the energy of the photons of the X-rays; the shorter the wavelength of the X-rays is, the more energetic the photons are, and the stronger the penetration. The penetration of X-rays is also related to the density of the material, the use of differential absorption of this property can be differentiated from the density of the material.
CR is a device that records X-ray images on an image plate (IP), which is read by a reading device and then converted to digital signals and input to a computer, and finally displayed on a display screen as a grayscale image through image processing. The IP board is made of crystallized fluorine compounds containing trace element pins. This substance records the initial light stimulation signal and releases a signal similar to the initial light stimulation when the light stimulation occurs again. The reader uses a high-precision laser scanner to read out the fluorescent signals, which are converted into digital signals and sent to a computer workstation, where image processing can be carried out according to different requirements, and the image characteristics can be freely changed over a wide range.
Broadly speaking, the information processing of CR can be divided into three parts: harmonic processing, spatial frequency processing and subtraction processing.? Harmonization processing involves image contrast, spatial frequency processing corresponds to the adjustment of frequency response, and subtraction is divided into the subtraction function of angiographic and non-angiographic images. As with other digital images, CR systems can be digitally stored and networked.