How can one determine if the proper mAs was selected when viewing a digital image?

Evaluating the exposure index value is a key method for determining if the selected mAs was appropriate when analyzing a digital image. The exposure index, which indicates the amount of radiation exposure the imaging receptor has received, helps radiologic technologists assess whether the image has been adequately or overexposed.

If the index value falls within the predetermined acceptable range, it suggests that the proper mAs was used for that specific imaging procedure. An exposure index that is too high could indicate overexposure, while a value that is too low could signal underexposure. Therefore, by relying on the exposure index, technologists can ensure that the image has been captured with the right balance of exposure, leading to optimal image quality and diagnostic accuracy.

While checking the imaging technique chart is useful for establishing initial exposure parameters, it does not provide real-time feedback on the exposure of the completed image. Reviewing the patient history or inspecting the edges of the image may provide context for the situation or highlight issues with the image itself, but they do not directly inform the technologist about the adequacy of the exposure in terms of mAs selected.