CT scanner and radio: what they have in common

1. Step 1. CT scanner — evolved from — X-ray machine. Tomography from many images.
2. Step 2. X-ray machine — has part — Vacuum tube. An X-ray tube.
3. Step 3. Vacuum tube — is part of — Car radio. The first car radios used vacuum tubes.
4. Step 4. Car radio — is a kind of — Radio. A radio receiver.

Open Evothings