Introduction to logic, with supplemental chapters by Monck W.H.S.

By Monck W.H.S.

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By Monck W.H.S.

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An entire plate can be read and digitized in ~10 seconds. After it has been read, the plate is then ‘bleached’ using several high-intensity lights, and inserted into a fresh cassette to be reused. There are many variations on the basic CR plate. 14, up to one-half of the light produced by the laser diodes may not be recorded, since it can escape through the bottom of the detector. For a standard CR plate, the base for the phosphor crystals is made of a reflective layer, which improves the detection efficiency.

However, it reduces the spatial resolution since the path that reflected light has to travel before being detected is twice as long, and the light spreads out as it travels (referred to as a broadened light spread function). For applications such as digital mammography, which requires very high resolution, an absorbent layer is placed at the bottom of the detector to reduce the light spread function to a minimum: however, this also results in reduced efficiency. A more sophisticated way to capture a higher percentage of the light is to use a dualsided CR plate, in which there are phosphor layers on both sides of a transparent plastic base, but this requires a more sophisticated CR reader.

High velocities. This potential difference is known as the accelerating voltage, or kVp. 3. The metal anode must be able to produce X-rays efficiently, and also be able to withstand the very high temperatures generated. In terms of efficiency, the higher the atomic number of the metal in the target, the higher the efficiency of X-ray production. The most commonly used metal is tungsten which has a high atomic number, 74, and a melting point of 3370 °C. In addition it has good thermal conductivity and a low vapour pressure, which allows a strong vacuum to be established within the X-ray tube, thus providing the electrons with an unimpeded path between cathode and anode.

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