Basic Equipment for Digital Medical Imaging
The digital image in common sense is the formation of image based on the reflected light of the 3D objects from the real world, and its 3D information can be understood through the fluoroscopy principle. However, x-ray imaging is a special kind of imaging formed by using a conical beam of light from a point source radiating through the body tissue on a photographic plate. The grayscale of images produced by x-ray reflects the different attenuation ratio of different human tissues. Due to the conical beam, the image will be more or less enlarged. At the edge of the image, the angles of the beam and photographic plate are a little large, which cause distortion of image to some extent. Thus, to measure the size of human body tissue based on an x-ray imaging accurately demands: on one hand, a reference is needed. According to some literature, a coin, the diameter of which has been known to us, can be used as a proportional scale during...
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