Читать книгу A Comprehensive Guide to Radiographic Sciences and Technology - Euclid Seeram - Страница 38

CT is a sectional imaging technique that produces direct cross‐sectional digital images referred to as transverse axial images. These images have been defined as planar sections that are perpendicular to the long axis of the patient. In CT, the patient is scanned as the x‐ray tube coupled to special electronic detectors rotate around the patient to collect and measure attenuation readings as shown in Figure 2.9. Furthermore, the raw data from the detectors are sent to a computer which uses an image reconstruction algorithm to build up images of the anatomy scanned. These images are subsequently displayed for viewing and interpretation, after which they are sent to an image communication system for storage, archiving, and communication to various remote locations, if needed.

Figure 2.8 The basic concept for DBT and DRT is related to the principle underlying conventional tomography, in which the x‐ray tube moves through various angles (limited arc) while the detector is stationary, capturing several images during the sweep. See text for further explanation.

Figure 2.9 In CT, the patient is scanned as the x‐ray tube coupled to special electronic detectors rotate around the patient to collect and measure attenuation readings as illustrated.