X-ray tube and sonar: what they have in common

1. Step 1. X-ray tube — is part of — Dental X-ray. A radiation source.
2. Step 2. Dental X-ray — has part — Image sensor. A digital sensor in the mouth.
3. Step 3. Image sensor — is part of — Security camera. A sensor.
4. Step 4. Security camera — has part — Monitor. A guard watches the camera feed on a monitor.
5. Step 5. Monitor — is part of — Ultrasound scanner. A screen.
6. Step 6. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.

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