Measurement Temperature Change In 1D Virtual Phantom Using Time of Flight Method

Abstract

In study, virtual acoustic phantom was created and acoustic simulation was performed for two different temperature distributions. Local time-shifts were calculated by applying cross correlation to ultrasonic signals obtained from simulation results. The temperature distribution was estimated by multiplying the axial slopes of the time shift vector by the tissue constant. In the temperature estimation, the back difference method and the linear fitting were used to find the slopes of the time shifts, and the results of two methods were compared. In study, the first temperature distribution, defines the tissue is uniform at 37°C, and in the second temperature distribution, the temperature is reaching 45°C in the center of tissue in the shape of Gaussian curve. The maximum deviation in the temperature estimation were found 1.99°C in the back difference method and 0.75°C in the linear fitting method. Study shows that, time-shift based temperature estimation is successful in on one-dimensional application. Thus, basis for future multidimensional simulation and experimental studies has been established.

Keywords

• ultrasound
• acoustic
• temperature measurement in tissues
• simulation
• time of flight method

BİR BOYUTLU SANAL DOKU ORTAMINDAKİ SICAKLIK DEĞİŞİMİNİN UÇUŞ ZAMANI YÖNTEMİ İLE HESAPLANMASI

Abstract

Bu çalışmada bilgisayar ortamında akustik fantom oluşturulmuş ve fantom üzerinde iki farklı sıcaklık dağılımı için akustik simülasyon gerçekleştirilmiştir. İki farklı sıcaklık dağılımı için elde edilen dönüş sinyallerine çapraz korelasyon uygulanarak yerel noktalardaki zaman kaymaları hesaplanmıştır. Zaman kayması vektörünün eksenel eğimlerinin doku sabiti ile çarpılmasıyla her noktadaki sıcaklık değişimi hesaplanmıştır. Sıcaklık tahmininde, analiz sonucunda bulunan zaman kaymalarının yatay eksene göre eğimlerinin bulunması için geri fark yöntemi ve doğru uydurma yöntemi kullanılmış ve sonuçlar karşılaştırılmıştır. Sıcaklık dağılımı ilk durumda doku 37°C’de üniform sıcaklıkta ve ikinci durumda doku merkezi 45°C ve etrafında çan eğrisi yaparak azalan şekilde tanımlanmıştır. Sıcaklık ölçümündeki maksimum sapmaların, geri fark yönteminde 1.99°C, doğru uydurma yönteminde 0.75°C olduğu ve kullanılan modelin tek boyutlu uygulamada yeterli olduğu görülmüştür. Bu çalışma ile birlikte ileride yapılacak çok boyutlu simülasyon ve deneysel çalışmalar için taban oluşturulmuştur.

Keywords

• ultrason
• akustik
• dokularda sıcaklık ölçümü
• simülasyon
• uçuş zamanı yöntemi

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