Elements and characteristics of X-ray photographic images

Five elements of X-ray photographic images: density, contrast, sharpness, granularity and distortion. X-ray imaging mainly means that when X-rays penetrate objects with different densities, the intensity of penetration is different. When there are dense objects, the light intensity of photographic film is small, and the color of developed film is dark.

Introduction:

X-ray is actually an electromagnetic wave with extremely high frequency, extremely short wavelength and great energy. In electromagnetic waves, the frequency and energy of X-rays are second only to that of γ-rays, with the frequency ranging from 30 PHZ to 300 Hz, the corresponding wavelength of 1pm~ 10nm and the energy of124EV ~1.24 MeV..

X-rays are penetrating, but there are differences in density and thickness between human tissues. X-rays will be absorbed in different degrees when they pass through different human tissues, and different images can be obtained after imaging processing.

It was Tesla who first discovered X-rays. He did many experiments to produce X-rays. Tesla believes that with his circuit, "the energy of X-ray light (that is, X-ray) that my instrument can produce is much greater than that of ordinary instruments."

He also talked about the harm of using his circuit and single-node X-ray generating equipment in his work. In many records of his investigation of this phenomenon, he attributed many causes of skin damage to. He believes that the early skin damage is not caused by X-rays, but by the contact between ozone and skin and some nitrous acid. Tesla mistakenly believes that X-rays are composed of separated particles.

Tesla completed some experiments before Roentgen and confirmed his findings (including taking X-rays of his hands and then sending them to Roentgen), but he didn't let his findings be widely known. Most of his research materials were burned in a laboratory fire on Fifth Avenue in March 1895.