A radiographic technique that uses lower mA values for prolonged exposure helps to:

Using lower mA (milliamperage) values for prolonged exposure in radiographic techniques is effective in reducing patient motion. When lower mA settings are utilized, the resulting images require a longer exposure time to achieve adequate density. This extended exposure allows patients who may not be able to remain perfectly still for short durations a greater chance to avoid motion blur. It can give slight movement that may occur minimal impact on the final image, as the blur may not be as pronounced with longer exposures compared to a rapid, high mA exposure where motion blur would be more visible.

While the other options hint at potential benefits, they do not directly correlate to the primary purpose of using lower mA with longer exposure times in this context. For instance, image contrast and enhancement of digital processing typically depend more on other factors like kVp selection and post-processing techniques rather than just mA alone, and while there may potentially be less equipment wear with lower mA settings, it is not the core advantage of using lower mA for extended exposure times.