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Sample text
Compression of images is useful because the smaller an image, the more that can be stored for a given archive and the faster the transmission. Compression can either be lossless or lossy. Reconstruction of the image from a lossless compression will be the same as the original image, while a lossy image will have some changes. e. there is no perceptible difference between the original and the reconstructed image. Compression ratio is defined as the ratio of the image size to the compressed image size, such that a 4 : 1 compression has reduced the image size by a factor of four.
A DDR system entails more changes in X-ray couch and vertical Bucky design and often changes to the X-ray tube assembly. Unlike the removable CR cassette, the DR plate or detector is fully integrated into the exposure equipment. The patient is radiographed and the image appears on the acquisition workstation in a few seconds. Here, the image can be optimized and then sent for reporting or repeated if necessary. An example of a computed radiography plate and cassette Uses CR is used in all areas where film/screen systems are currently used, including mammography.
Considering a spherical object of uniform density, then absorption will be greatest at the centre and least at the periphery due to the difference in thickness. This gradual fall-off in absorption towards the edges leads to the image having an ill-defined boundary called absorption unsharpness, particularly as most structures in the body have a round edge. Little can be done to reduce this type of unsharpness, apart from increasing image contrast or using digital edge-enhancement techniques. Immobilization devices Object Object Photographic unsharpness Image absorption unsharpness Image X-rays X-rays Screen Screen Light Film Light Film Poor film/screen contact An X-ray image could be formed by the direct action of X-rays on a photographic emulsion, but more usually the X-ray image is first converted into a light image by intensifying screens.
