By Smith N.B., Webb A.
Protecting the fundamentals of X-rays, CT, puppy, nuclear drugs, ultrasound, and MRI, this textbook presents senior undergraduate and starting graduate scholars with a vast advent to clinical imaging. Over one hundred thirty end-of-chapter workouts are incorporated, as well as solved instance difficulties, which allow scholars to grasp the idea in addition to delivering them with the instruments had to resolve tougher difficulties. the elemental idea, instrumentation and state of the art options and functions are lined, bringing scholars instantly updated with contemporary advancements, reminiscent of mixed computed tomography/positron emission tomography, multi-slice CT, 4-dimensional ultrasound, and parallel imaging MR know-how. scientific examples offer useful functions of physics and engineering wisdom to drugs. ultimately, useful references to specialized texts, fresh evaluation articles, and suitable clinical journals are supplied on the finish of every bankruptcy, making this a great textbook for a one-semester direction in scientific imaging.
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Extra resources for Introduction to medical imaging: Physics, engineering and clinical applications
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.