By Lois E. Romans
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Extra info for Computed tomography for technologists
Scan field of view is discussed in more detail in Chapter 3. Detectors can be made from different substances, each with their own advantages and disadvantages. indd 17 allows a system to be used without the interruption of frequent calibration. Overall detector efficiency is the product of a number of factors. These are 1) stopping power of the detector material; 2) scintillator efficiency (in solid-state types); 3) charge collection efficiency (in xenon types); 4) geometric efficiency, defined as the amount of space occupied by the detector collimator plates relative to the surface area of the detector; and 5) scatter rejection.
Indd 15 FIGURE 22 The gantry houses many of the components necessary to produce and detect x-rays. The gantry cover is removed on this third-generation scanner configuration to reveal the components necessary for data acquisition, including the x-ray tube and detector array. Image courtesy of Siemens AG. 11/13/2009 9:30:34 AM 16 Computed Tomography for Technologists: A Comprehensive Text Generators produce high voltage and transmit it to the x-ray tube. The power capacity of the generator is listed in kilowatts (kW).
Although many more detector elements are included in this design, the number of detectors in use at any one time is controlled by the width of the beam. In the stationary detector design, the readings that make up a view are recorded consecutively during approximately one-fifth of the scan time. Because the emerging beam does not strike the detectors at exactly the same time, motion artifacts are more of a problem. Fourthgeneration systems often use overscans to address this problem. An overscan is a tube arc greater than 360°.