PET scanner and radar: what they have in common

1. Step 1. PET scanner — has part — Photodiode. Photodetectors register the scintillations.
2. Step 2. Photodiode — is a kind of — Diode. A kind of diode.
3. Step 3. Diode — is part of — Crystal radio. A crystal detector is a diode.
4. Step 4. Crystal radio — has part — Antenna. An antenna.
5. Step 5. Antenna — is part of — Radar. An antenna emits and receives.

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