By Lois E. Romans
Splendid for 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) common Radiography and Computed Tomography assessments. The textual content additionally comprises gains and assets to ease the transition into genuine medical atmosphere. geared up round the 3 significant ARRT content material different types, Romans comprises student-friendly scientific program packing containers so as to add real-world relevance. Highlighted keyword phrases, Key suggestion containers, and bankruptcy evaluation questions, advised interpreting, and different beneficial properties support to make sure mastery of the subject.
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Additional info for Computed Tomography for Technologists: A Comprehensive Text
A few systems collect data outside the field of view, but apply calibration only to the selected scan field size. In these systems, anatomy just outside the SFOV will not cause significant artifacts. indd 28 To select the amount of raw data to be displayed on the CT image, the operator selects some number 11/13/2009 9:32:59 AM Image Reconstruction A 29 A B FIGURE 36 Selecting the display field of view determines how much of the raw data are used to create an image. Display field works like the zoom on a camera and can be used to show the entire area or to display a specific region of interest in greater detail.
A disadvantage of xenon gas is that it must be kept under pressure in an aluminum casing. This casing filters the x-ray beam to a certain extent. Loss of x-ray photons in the casing window and the space taken up by the plates are the major factors hampering detector efficiency. Figure 2-4 demonstrates the basic structure of a xenon gas detector array. Solid-State Crystal Detector Solid-state detectors are also called scintillation detectors because they use a crystal that fluoresces when struck by an x-ray photon.
However, with such technologic innovation comes complexity. To develop and practice the most safe and effective scanning methods, radiologic technologists must first understand the physical principles that make up the foundation of CT. 11/13/2009 9:31:05 AM Basic Principles of CT REVIEW QUESTIONS 1. What are the main advantages of CT over conventional radiography? 2. What defines the Z axis? 3. Define pixel, voxel, and matrix. 4. Explain beam attenuation. What determines a structure’s ability to attenuate the x-ray beam?
Computed Tomography for Technologists: A Comprehensive Text by Lois E. Romans