Which exposure parameter set would yield the highest image quality given the listed options?

• A. 300 mA, 97 kVp, .35 sec exp time 1.2 mm fs, 1.5 mm Al filtration, 3 lp/mm, MTF= 25%
• B. 600 mA, 85 kVp, .70 sec exp time, 1.2 mm fs, 1.5 mm Al filtration, 4 lp/mm, MTF= 40%
• C. 200 mA, 110 kVp, .25 sec exp time, 2.0 mm fs 1.2 mm Al filtration 2 lp/mm, MTF = 30%
• D. 600 mA, 85 kVp, .70 sec exp time, 0.6 mm fs, 1.0 mm Al filtration, 1.5 lp/mm, MTF= 60%

Answer: (B)

Image quality comes from sharpness of detail and the ability to preserve contrast, which are described by how much detail a system can resolve (lp/mm) and how well it preserves contrast at those frequencies (MTF). Among the options, the set with the highest ability to resolve fine detail is the one offering four line pairs per millimeter, meaning it can depict finer structures. This is paired with a reasonable MTF (good contrast preservation at those frequencies) and the same overall exposure as the other high-current option, while filtration helps remove unnecessary low-energy photons that would raise patient dose without improving image formation. The result is a sharper, more informative image for fine details, without extra dose. The other sets either limit spatial resolution, reduce subject contrast (high kVp), or mix factors in a way that doesn’t improve the overall ability to show fine structures, so they don’t achieve as clear a image as the chosen option.