By Lois E. Romans
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Extra resources for Computed tomography for technologists
Sample text
On some systems, only two choices are available: half-field, which is used for the head, and full-field, which is used for everything else. BOX 39 Key C ncept SFOV determines the area, within the gantry, from which the raw data are acquired. 11/13/2009 9:32:58 AM 28 Computed Tomography for Technologists: A Comprehensive Text A A Ring outside scan field where no data are being acquired B Gantry Scan field of view Fan beam Isocenter Fan beam X-ray tube Patient FIGURE 35 The selection of scan field of view determines the number of detector cells collecting data.
Hard Disk The hard disk (or hard drive) is an essential component of all CT systems. The number of images that the hard disk can store varies according to the make and model of the scanner. It is important to remember than an enormous amount of information is collected for each image. For example, a single image in a 512 matrix system consists of 262,144 pixels (512 × 512). The digitization requires 10 to 12 bits; an 8-bit byte is standard. Therefore, it takes 2 bytes to cover each pixel in the dynamic range.
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? 5. What unit quantifies a structure’s ability to attenuate the x-ray beam? 6. What is the relationship between Hounsfield units and the linear attenuation coefficient? indd 13 13 7. What are image artifacts? 8.