Hears the pitch: Research team invents a new mode of photoacoustic imaging
(PHYSorg.com Physics)

Did you know that music and diagnostic imaging have something in common? Sounds have a lower or higher pitch depending on the size of the object that creates them. Tubas and double basses are big and produce deep low-pitch sounds, while flutes and violins are small and produce high-pitched sounds. What`s interesting is that the same effect occurs when biological structures like cells or tissues emit sound-the pitch varies with size.