Which statement best describes radiation considerations in pediatric neuroimaging?

• A. MRI avoids radiation; CT uses radiation
• B. CT avoids radiation; MRI uses radiation
• C. Both MRI and CT avoid radiation
• D. Ultrasound should replace MRI in all cases

Answer: (A)

Radiation exposure differences between MRI and CT in children drive this concept. MRI uses magnetic fields and radiofrequency energy, so there is no ionizing radiation involved. CT, on the other hand, relies on X-rays and does expose patients to ionizing radiation. In pediatrics, this matters because children are more sensitive to radiation and have a longer lifetime in which radiation-related risks could emerge. Clinically, MRI is preferred when we want to avoid radiation, while CT is valued for its speed and usefulness in acute settings where a rapid diagnosis is essential, though it carries a radiation dose. Ultrasound has limited brain imaging utility in most pediatric neuro cases and cannot replace MRI in the majority of scenarios. So the statement that MRI avoids radiation and CT uses radiation best captures the radiation considerations in pediatric neuroimaging.