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Microbubble ultrasound contrast agent (UCA) has been well recognized as a potential noninvasive tool for the blood pressure measurement. A decrease in subharmonic amplitude of 9 to 12 dB has been reported for Levovist, Optison, Definity, Sonazoid, and SonoVue for ambient overpressure values around 180 mmHg. However, a pressure resolution of 3 mmHg is desirable in medical diagnostics, it is still necessary...
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 aim of this in vitro study is to explore the correlations between quantitative ultrasound (QUS) parameters and micro-structure parameters of cancellous bone. Cube of swine cancellous bone were resort to progressively decalcification and subjected to QUS and micro computed tomography. Ethylene Diamine Tetraacetic Acid (EDTA) decalcification was used to remove calcium. SOS, an important QUS parameter,...
A-mode medical ultrasound device is important tool for clinical examinations in many clinical departments, especially ophthalmology. However, many complex or obscure features can not be identified well using these existing instruments, the reason is that ultrasonic echo waveforms from body contain more plentiful information than is utilized in conventional A-model medical ultrasound instrument, so...
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