By Lois E. Romans
Splendid for CT classes in radiologic expertise 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 positive factors and assets to ease the transition into genuine medical surroundings. prepared round the 3 significant ARRT content material different types, Romans accommodates student-friendly medical program containers so as to add real-world relevance. Highlighted keywords, Key idea packing containers, and bankruptcy assessment questions, instructed analyzing, and different gains support to make sure mastery of the subject.
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Additional resources for Computed Tomography for Technologists: A Comprehensive Text
What are image artifacts? 8. Why does the slice thickness vary among examination protocols? 9. What is the anatomic position? 10. How are x-ray photons produced? 11/13/2009 9:31:05 AM Chapter 2 DATA ACQUISITION Key Terms: gantry aperture · highfrequency generator · power capacity · slip rings · cooling systems · focal spot size · compensating ﬁlters · bow tie ﬁlters · prepatient collimators · predetector collimators · detector · detector array · reference detectors · detector eﬃciency · afterglow · capture eﬃciency · absorption eﬃciency · response time · dynamic range · detector spacing · detector aperture · third-generation design · ring artifacts · fourth-generation design · electron beam imaging · data-acquisition system · analog-to-digital converter · sampling rate · table incrementation · anatomic landmark · scannable range · table referencing CT scanners are complex, with many different components involved in the process of creating an image.
Solid-state crystal detectors have been made from a variety of materials, including cadmium tungstate, bismuth germinate, cesium iodide, and ceramic rare earth compounds such as gadolinium or yttrium. indd 18 density in comparison to gases, solid-state detectors have higher absorption coefficients. 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.
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?