For a lumbar spine series, what consideration is most important when selecting the beam restriction method?

• A. Maximizing the beam intensity.
• B. Choosing a field that is larger than the area to be imaged for flexibility.
• C. Adjusting the beam size to precisely match the lumbar area being imaged to minimize dose and improve image quality.
• D. Relying on automatic collimation alone.

Answer: (C)