If net magnetization increases, which is the most accurate description of imaging contribution?

• A. More protons involved in imaging
• B. No change
• C. Protons become random
• D. Imaging becomes impossible

Answer: (A)

Net magnetization reflects how many proton magnetic moments are aligned with the main magnetic field. When more protons align, the net magnetization grows, providing a larger source of magnetization that can be tipped into the transverse plane to generate the MR signal. This larger transverse magnetization yields a stronger, more detectable signal, so the imaging contribution increases because more spins effectively participate in forming the image. If alignment didn’t increase or if spins were random, the signal would be weaker or unchanged, and imagining would not improve.