A Tissue-Mimicking Ultrasound Test Object Using Droplet Vaporization to Create Point Targets

作者：Carneal Catherine M^*; Kripfgans Oliver D; Kruecker Jochen; Carson Paul L; Fowlkes J Brian

来源：IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2011, 58(9): 2013-2025.

DOI：10.1109/TUFFC.2011.2045

Ultrasound test objects containing reference point targets could be useful for evaluating ultrasound systems and phase aberration correction methods. Polyacrylamide gels containing albumin-stabilized droplets (3.6 mu m mean diameter) of dodecafluoropentane (DDFP) are being developed for this purpose. Perturbation by ultrasound causes spontaneous vaporization of the superheated droplets to form gas bubbles, a process termed acoustic droplet vaporization (ADV). The resulting bubbles (20 to 160 mu m diameter) are small compared with acoustic wavelengths in diagnostic ultrasound and are theoretically suitable for use as point targets (phase errors <20 degrees for typical f-numbers). Bubbles distributed throughout the material are convenient for determining the point spread function in an imaging plane or volume. Cooling the gel causes condensation of the DDFP droplets, which may be useful for storage. Studying ADV in such viscoelastic media could provide insight into potential bioeffects from rapid bubble formation.

• 出版日期2011-9