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Medical Term:


Pronunciation: mī′krō-buhb′bel

Definition: A vascular contrast material for ultrasound, air stabilized within some kind of membrane, such as a surfactant, like a tiny soap bubble, which gives marked reflections of the signal at higher harmonic frequencies; the size (1–7 mcm) works well in the useful diagnostic frequency range of ultrasound (2–10 Hz).

See Also: pulse-inversion contrast harmonic imaging