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A variety of cardiovascular conditions such as hypertension are related to the decay in the mechanical properties of blood vessels. We combine continuous wave Doppler ultrasound measurement of blood velocity with high-resolution compressive force sensing to design a sensor to analyze the hemodynamic characteristics of blood vessels. We test the spe...
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Context 1
... designed a physical system to calibrate the output voltage of the Doppler system with the velocity of the fluid. Fig. 3 shows our phantom system calibration setup. We are able to generate varying fluid speeds through thin Teflon tubing with 2.38mm internal diameter. The fluid was pumped manually through a syringe and the flow rate was analyzed by video capture of the syringe markings. We casted a well concentrated gelatin mold in a flexible container ...
Context 2
... calibration was done using the phantom setup as well as the blood mimicking fluid in the setup shown in Fig. 3. Five different flow rates were forced though the system (and video tracked) and compared to a measurement with our Doppler Tonometer. Fig. 4B shows the calibration curve to be ...
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In many diseases with a cardiovascular component, the geometry of microvascular blood vessels changes. These changes are specific to arteries and veins, and can be studied in the microvasculature of the retina using retinal photography. To facilitate large-scale studies of artery/vein-specific changes in the retinal vasculature, automated classific...
Citations
... Akinin et al. designed and manufactured a Doppler tonometer sensor system with a sub-resolution of 0.1 N. Multiple tests were performed including a study on a subject's arm [27]. A vein was located and cycles of increased and decreased pressure were implemented. ...
... A vein was located and cycles of increased and decreased pressure were implemented. Figure 17 [27] shows the applied force and corresponding velocity as a function of time. ...
... Block diagram of a Doppler tonometry system (adapted with permission from Akinin et al.[27]) ...
This review presents an overview of previously reported non-invasive intra-abdominal pressure (IAP) measurement techniques. Each section covers the basic physical principles and methodology of the various measurement techniques, the experimental results, and the advantages and disadvantages of each method. The most promising non-invasive methods for IAP measurement are microwave reflectometry and ultrasound assessment, in combination with an applied external force.
