How does medical ultrasound make an image, and is “always completely safe” an exact statement?

Solution & explanation

A transducer emits pulses and detects echoes from tissue boundaries; return times and strengths help construct an image. It uses non-ionizing sound rather than X-rays. Exposure and equipment settings still matter: clinical use follows professional guidance, so the printed absolute safety wording is too broad.

FDA · ultrasound benefits and risks ↗ ·