Which group of exposure factors is most effective for controlling involuntary motion during radiography?

To effectively control involuntary motion during radiography, the most crucial factor is the exposure time. Involuntary motion—caused by natural physiological movements such as breathing or peristalsis—can create blurring in images. The key to minimizing this blur is to reduce the exposure time while maximizing the mA (milliamperes) to maintain image quality.

The combination of 600 mA and a 0.02-second exposure time is particularly effective because the high mA allows for greater photon production in a shorter time frame, thus enabling a quick capture of the image. This brief duration significantly reduces the chance for motion to occur, resulting in a clearer image. The high mA also compensates for the short exposure time, ensuring that adequate image density is achieved.

In radiography, reducing exposure time is generally the most effective method to minimize the influence of involuntary motion, and the chosen values in this combination strike an optimal balance. Other combinations may either not provide enough mA to compensate for longer exposure times or result in unnecessarily prolonged exposure times, which can lead to increased motion artifacts.