Final answer:
Automatic Brightness Control (ABC) is utilized in fluoroscopic equipment to automatically adjust image brightness and is especially useful for children, infants, and extremely large patients who may cause variable image brightness due to movements or varying tissue densities.
Step-by-step explanation:
Automatic Brightness Control (ABC) on fluoroscopic equipment may be used in various situations to adjust the brightness of the image automatically. This feature compensates for patient thickness and density changes, providing consistent image quality and reducing manual adjustments. For instance, it can be particularly beneficial on children incapable of understanding instruction to remain motionless because their involuntary movements can result in variability in image brightness, which ABC can adjust for automatically. It is also useful on extremely large patients, where tissue density and thickness can vary significantly, making manual brightness adjustment challenging. Additionally, ABC can be helpful when working on infants, as they are also generally incapable of following instructions to stay still during the procedure. While ABC can potentially be used at all times, its benefits are more pronounced in these specific cases.