Download Computed Tomography for Technologists: A Comprehensive Text by Lois E. Romans PDF

By Lois E. Romans

Best for CT classes in radiologic expertise courses, or for stand-alone CT courses, this article prepares scholars either for mastery of the yank Registry of Radiologic Technologists (ARRT) basic Radiography and Computed Tomography checks. The textual content additionally comprises positive factors and assets to ease the transition into genuine medical atmosphere. geared up round the 3 significant ARRT content material different types, Romans contains student-friendly scientific software packing containers so as to add real-world relevance. Highlighted key words, Key suggestion packing containers, and bankruptcy evaluate questions, steered studying, and different beneficial properties support to make sure mastery of the subject.

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In addition, creating a more uniform beam intensity improves the CT image by reducing artifacts that result from beam hardening. BOX 24 Cooling Systems Cooling mechanisms are included in the gantry. They can take different forms, such as blowers, filters, or devices that perform oil-to-air heat exchange. Cooling mechanisms are important because many imaging components can be affected by temperature fluctuation. X-ray Source X-ray tubes produce the x-ray photons that create the CT image. Their design is a modification of a standard rotating anode tube, such as the type used in angiography.

BOX 34 Works Key C ncept: How Computer Memory • The computer is turned on. • The computer loads data from ROM and performs tests to make sure all the major components are functioning properly. The computer loads the basic input/output system from ROM, providing information about things such as storage devices, start-up sequences, security, and ancillary device recognition. • The computer loads the operating system (OS) from the hard disk into the system’s RAM. The critical parts of the OS are maintained in RAM as long as the computer is on, allowing the CPU to have immediate access to the OS.

Of course, the retrospective images must be created while the raw data are still available. In contrast, assume the scan was taken in error using a 25-cm SFOV (intended for a head scan) as well as a 25-cm DFOV. The prospective image that resulted would look similar to that of Figure 3-8A (there may be pronounced out-of-field artifact). However, in this situation no data were collected beyond those displayed, so the image could not be reconstructed with a larger DFOV. indd 29 FIGURE 37 A. Important parts of the anatomy are cut off in this image, displayed with a 25-cm field of view.

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