Design of a contact type acoustic sensor for the noninvasive diagnosis of cardiovascular obstructions

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2022-12

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Balçık, Çağlar Yazgan

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The idea of determining arterial occlusions by non-invasive methods is a subject that has been studied for many years. Current diagnostic methods are mostly invasive, potentially risky and costly. There are studies in the literature that concentrate on the turbulent flow occurring in the arteries as a result of arterial occlusions. This results in acoustic pressure exciting the internal artery wall. In this study, a contact-type acoustic sensor design was carried out with based on the existing studies in the literature and a prototype was produced. The contact-type acoustic sensor that has been designed and prototyped has a receiving sensitivity of –126 dBV (ref 1 Pa) and a 5-dB beamwidth of 70 degrees. In addition, the prototype produced is a structure that can be used as a contact-type acoustic sensor with a fixed response up to 2000 Hz. In addition, an experimental setup modeling arterial occlusion was produced to validate the design. Measurements were made with the prototype sensor at occlusion rates of 99%, 90% and 70%, at blood flow rates of 10 mL/sn and 20 mL/sn. The results have been found to be relevant to the findings available in the past studies. The effect of turbulent flow in the arteries has been found to be between 100 Hz and 600 Hz and dominant around 300 Hz. The threshold to detect the occlusion in the artery by using acoustic methods has been determined to be 70% which is in agreement with the existing literature.

Subject Keywords

Acoustic diagnosis, Contact sensor development, Atherosclerosis

URI

https://hdl.handle.net/11511/101336

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ç. Y. Balçık, “Design of a contact type acoustic sensor for the noninvasive diagnosis of cardiovascular obstructions,” M.S. - Master of Science, Middle East Technical University, 2022.