Hydrogen atoms (protons) in your body spin like tiny magnets pointing every which way.
🧲MRIgreat for soft tissue: brain, muscles, joints. No radiation, but loud and slow
☢️X-rayfast and cheap; great for bones; small radiation dose
🌀CT scanmany X-rays from all angles → 3-D slices
🔊Ultrasoundsound echoes; safe for babies before birth
🔥PETshows activity using a tracer
🚫Safetyno metal near an MRI: the magnet is ~30,000× Earth’s field!