Computed tomography for technologists by Lois E. Romans

By Lois E. Romans

Ideally suited to CT classes in radiologic know-how courses, or for stand-alone CT courses, this article prepares scholars either for mastery of the yankee Registry of Radiologic Technologists (ARRT) basic Radiography and Computed Tomography checks. The textual content additionally comprises gains and assets to ease the transition into real medical surroundings. equipped round the 3 significant ARRT content material different types, Romans accommodates student-friendly scientific software containers so as to add real-world relevance. Highlighted keywords, Key proposal packing containers, and bankruptcy evaluate questions, advised studying, and different good points support to make sure mastery of the subject.

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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. Can it be corrected without rescanning?

A numeric readout of the table location relative to the gantry is displayed. When the patient is placed within the gantry, an anatomic landmark, such as the xiphoid or the iliac crest, is adjusted so that it lies at the scan point. At this level, the table is referenced, which means that the table position is manually set at zero by the technologist. Accurate table referencing helps to maintain consistency between examinations. For example, if a lesion is seen on an image that is 50 mm inferior* to the xiphoid landmark (zero point), the patient is removed from the gantry, and a ruler is used to measure 50 mm inferior from the xiphoid.

They absorb nearly 100% of the photons that reach them. In addition, there is no loss in the front window, as in xenon systems. This increased absorption efficiency is the chief advantage of solid-state detectors. Solid-state detectors may produce a brief afterglow. However, this has been greatly reduced or eliminated in modern CT detectors. Solid-state detectors are more sensitive to fluctuation in temperature and moisture than the gas variety. Table 2-1 compares solid-state detectors to the xenon gas variety.

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