Final answer:
The SFOV in CT imaging is larger than the DFOV, and data within the SFOV are saved on the CT system. While technologists have some control over the imaging area, the SFOV size is pre-established by the scanner's design parameters.
Step-by-step explanation:
In computed tomography (CT) imaging, the scan field-of-view (SFOV) and the display field-of-view (DFOV) play important roles in image acquisition and processing. The SFOV represents the area within which the CT detectors collect data while the DFOV pertains to the portion of the SFOV displayed on the screen for review by radiologists. The correct statements concerning the SFOV are:
- The SFOV is usually larger than the DFOV.
- Data in the SFOV is saved on the CT computing system.
The statements mean that while the entire area scanned (SFOV) is larger, only a selected portion (DFOV) is typically sent to the radiologist for analysis. The SFOV is designed to ensure that the necessary data is collected and saved, even beyond what will be reviewed on the display. Furthermore, the size setting of the SFOV is typically determined by parameters predefined by the CT scanner's design and not solely by the technologist, though the technologist may have some ability to adjust the area being imaged based on the scout image.