sonomicrometer

son·o·mi·crom·e·ter

(son'ō-mī-krom'ĕ-tĕr),
An operatively implanted ultrasonic dimension gauge to measure the wall thickening and motion of the heart.
References in periodicals archive ?
have reported on the ability to use NIR transmission through the fingertip at a single pseudoisosbestic wavelength (905 nm) coupled with a sonomicrometer to monitor pulsatile changes in the optical pathlength through the finger as well as correct for interpatient variation in finger diameter (25).