ULTRASONIC PARAMETERS OF CONCENTRIC LAMINATED URIC-ACID STONES

Recently a new idea for the disintegration of urinary calculi based up on the large difference of the acoustic impedance inside urinary calcu li was suggested. This large difference of acoustical impedance betwee n the two main components of kidney stones, is confirmed in this paper for smooth laminated uric acid stones by two different experimental t echniques measuring sound velocities: a surface contact and a submersi on technique. Our measured values correlate well with the large differ ences of the earlier reported measured sound velocities. In general, t he disintegration of a urinary stone can be described as follows: a ur inary calculus is an inhomogeneous geometrical structure, and its stru cture plays an important role in the disintegration process.