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. Author manuscript; available in PMC: 2007 Oct 1.
Published in final edited form as: J Acoust Soc Am. 2006 Jun;119(6):3766–3772. doi: 10.1121/1.2201251

FIG. 4.

FIG. 4

Beam profiles in the focal plane of the 120-kHz transducer. The decrease of the pressure amplitude (lower curve) was caused by the introduction of a clot sample into the acoustic field. The relative reduction of the acoustic pressure at the center of the beam was used to determine the amplitude coefficient of attenuation. Error bars represent the standard deviation of the measurements in three clots. The Tegaderm™ films used in the experiments do not cause a significant change of the pressure amplitude due to attenuation in the material of the film.