Acquisition of diastolic heart sounds via a noninvasive method
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- Tez No: 364485
- Danışmanlar: DOÇ. DR. HALİL ÖZCAN GÜLÇÜR
- Tez Türü: Yüksek Lisans
- Konular: Tıbbi Biyoloji, Medical Biology
- Anahtar Kelimeler: Heart sounds, coronary atherosclerosis, sonic probes
- Yıl: 1994
- Dil: İngilizce
- Üniversite: Boğaziçi Üniversitesi
- Enstitü: Biyo-Medikal Mühendislik Enstitüsü
- Ana Bilim Dalı: Biyomedikal Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 66
Özet
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Özet (Çeviri)
It has recently been shown that sounds caused by the turbulent flow in partially occluded coronary arteries may be used for detecting the location of occlusions and is valuable for an early, nomnvaslve diagnosis of coronary atherosclerosis. Unfortunately, it is difficult to isolate and analyze these sounds directly, since they are corrupted with sounds having similar characteristics which originate from certain internal sources, such as the valve sounds, or sounds from some external sources. In this thesis work a special instrumentation system for the acquisition of diastolic heart sounds is developed and physically realized. The system consists of two passive sonic probes, two sound channels, anECG channel, various filters, a Personal Computer equipped with an analog-to-digital converter board and a special data acquisition software. To reduce amplifier saturation and cut-off problems, which might arise when the sensitive amplifiers of the system are subjected to momentary large inputs, like the S 1 and S2 valve sounds, a logarithmic amplification has been used. One of the sound channels is used for monitoring the environmental noise. Using the information from this channel, the system software adaptively cancels out the effects of external noise, allowing measurements in ordinary, non-sound-proof rooms. The ECG channel is used for placing time windows properly, during the diastolic phase of the heart, at which time background sounds are minimum and the sounds coming from the occluded coronary arteries are maximum.
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