Which statement is NOT listed as an advantage of 3-phase or high-frequency generators over single-phase generators?

• A. Near constant potential
• B. Higher mA can produce very short exposures
• C. Higher effective kVp
• D. Longer exposure times

Answer: (D)

Longer exposure times are not an advantage of three-phase or high-frequency generators. These generators provide a near-constant tube potential with very low voltage ripple, which makes x-ray production more efficient and consistent during the exposure. That stability, combined with the ability to deliver higher instantaneous mA, lets you generate the needed radiation in a shorter time, reducing motion blur and improving image quality. The beam’s effective energy is also higher with these waveform advantages, meaning better penetration for the same nominal kVp. So the true benefits are steadier voltage (less ripple), higher possible current for shorter exposures, and higher effective kVp; opting for longer exposure times would negate these benefits.