What is the role of Automatic Gain Control (AGC) when ABC reaches its maximum threshold?

The role of Automatic Gain Control (AGC) is crucial when assessing exposure in imaging systems. When ABC (Automatic Brightness Control) reaches its maximum threshold, AGC takes over by adjusting the amplification based on the levels of radiation detected. This ensures that the image maintains a consistent brightness without being overwhelmed by high radiation levels.

AGC operates by dynamically modifying the gain settings, providing a balanced image even as radiation exposure fluctuates. This is essential for maintaining image quality, as it compensates for variations in patient size, anatomy, or other variables that could impact the acquisition of diagnostic quality images.

This function is particularly important because without AGC, the imaging system might either produce images that are too dim or overly bright if the radiation levels are higher than the threshold, potentially obscuring important details in the diagnostic process.