The effect of mAs variation upon computed tomography image quality as evaluated by in vivo and in vitro studies.

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Abstract
The effect of different mA settings on computed tomography (CT) image quality was evaluated by a human study and phantom studies. In the clinical portion of this study, a number of CT images, obtained at various mA settings, were reviewed by experienced CT interpreters. From these same images, graphs were charted of the root-mean SD (RMSD) vs. body size; there appeared to be a linear relationship between noise, as measured by RMSD, and body size. A performance phantom was used to evaluate the effect of the different mA settings on resolution. There was some loss in low contrast resolution at 6 and 20 mA; however, the resolution was identical at 40 and 100 mA.

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