Which of the following are cited as technical advantages of 3-phase and high-frequency generators over single-phase generators?

• A. 1 and 2
• B. 1 and 3
• C. 2 and 3
• D. 1, 2, and 3

Answer: (D)

Three-phase and high-frequency generators give the x-ray system a smoother, more stable power supply, which shows up in a few clear ways. First, the voltage waveform has much less ripple, so the beam output is more uniform during an exposure and the resulting image quality is more consistent. Second, these generators keep the tube voltage closer to the set kilovoltage even as load on the tube changes, so the kVp remains stable and exposure reproducibility improves. Third, the high-frequency designs and multi-phase arrangements are more efficient and compact, with better heat handling, which allows higher instantaneous power and often shorter exposure times. Because each of these points is cited as a technical advantage, all three are considered correct.