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Ultrasound contrast agents (UCA) microbubbles have been well recognized as a potential noninvasive tool for blood pressure measurement. The effect of ambient pressure on UCA subharmonic optimal driving frequency (SODF), at which the subharmonic scattering signals were maximal, was investigated experimentally. For groups of microbubbles with 80.1%±1.6% in the diameter range of 1µm–2µm, the shift of...
The microbubble ultrasound contrast agent (UCA) has been widely recognized as a potential noninvasive tool for blood pressure measurement. However, UCA indices such as the shift in the resonance frequency and echo amplitude have problems of low resolution, nonlinear relationship with blood pressure, etc. In this paper, a novel UCA index, the shift in the subharmonic optimal driving frequency (SSODF)...
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