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BU Dental Radiology Practice Exam

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The milliampere (mA) setting controls which image attribute?
Correct Answer:
Density
Explanation:
The main idea is that the milliampere setting determines how many X-ray photons are produced, which changes the image density—the overall darkness of the radiograph. Increasing mA raises the tube current, producing more photons, so more radiation reaches the film or sensor and the image becomes darker. Decreasing mA does the opposite, making the image lighter. This is different from sharpness (which relates to focusing and motion) and distortion (geometric misalignment) or contrast (which is mainly affected by kVp and subject factors). So the attribute controlled by mA is density.

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