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. Author manuscript; available in PMC: 2019 Feb 1.
Published in final edited form as: Ultrasound Med Biol. 2017 Nov 22;44(2):434–446. doi: 10.1016/j.ultrasmedbio.2017.09.021

Figure 1.

Figure 1

Schematic of the apparatus used for performing size distribution measurements of Definity® at room (25 °C) and physiological (37 °C) temperatures. PID = proportional integral derivative, UCA = ultrasound contrast agent.