MEME DOKUSU İÇİN TİTREŞİM TABANLI ÖLÇÜM SİSTEMİ

Öz

Meme tümörünün teşhisine yönelik literatürdeki çalışmalar incelendiğinde, meme dokularının farklı karakteristikler taşıdığı olgusuna dayanan birçok çalışmaya rastlanmaktadır. Ancak sabit frekanslı titreşim uyartımı ile sağlıklı ve tümörlü meme dokularının bu uyartıma vereceği tepki sayesinde tümörün teşhisine yönelik bir çalışmaya rastlanmamıştır. Bu çalışmada, meme dokuları üzerinde belirlenen noktalara, sabit frekansta titreşim uygulanmış ve bu noktalardan belirli uzaklıklarda titreşim sinyallerini ölçebilen sistem tasarımı amaçlanmıştır. İlgili sistemin ilk kısmı, titreşim sağlayan bir motor ve sürücüden oluşmaktadır. Diğer kısmı ise, meme dokularındaki belirli noktalarda titreşimleri ölçen ivmeölçer sensörlerini içermektedir. Donanımın kontrolü ise, mikrodenetleyici tabanlı modül ile gerçekleştirilmektedir. Tasarlanan bu cihaz yardımıyla, meme fantom modelleri üzerinden elde edilen ölçümlerle alınan titreşim sinyallerinin güç spektrumları incelenmiştir. 160 Hz. titreşim uyartımına karşılık, ivmeölçer sensörü ile belirli bir mesafeden ölçülen sinyallerin baskın frekanslarının 120-140 Hz. aralığında olduğu görülmüştür. Bu sonuçlar, meme dokusunun sönümleyici etkisini ve sönümleme etkisinin tümörlü ve sağlıklı dokularda farklılık olabileceğini göstermektedir.

Anahtar Kelimeler

• Meme Dokusu
• Titreşim Sinyali
• İvmeölçer Sensörü
• Güç Spektrali

VIBRATION-BASED MEASUREMENT SYSTEM FOR BREAST TISSUE

Öz

When the studies in the literature on breast tumor diagnosis are examined, there are many studies because breast tissues have different characteristics. However, there is no study on the diagnosis of the tumor by constant frequency vibration stimulation and the response of healthy and tumorous breast tissues to this stimulation. This study, fixed frequency vibration was applied to the points determined on breast tissues and it was aimed to design a system that can measure vibration signals at certain distances from these points. The first part of the system consists of a motor and a driver that provides vibration. The other part includes accelerometer sensors that measure vibrations at certain points in the breast tissues. The hardware is controlled by a microcontroller-based module. With the help of this designed device, the power spectra of the vibration signals obtained by measurements on breast phantom models were analyzed. In response to 160 Hz vibration excitation, the dominant frequencies of the signals measured at a certain distance with the accelerometer sensor were found to be in the range of 120-140 Hz. These results show the damping effect of breast tissue and that the damping effect may differ between tumor and healthy tissues.

Anahtar Kelimeler

• Breast Tissue
• Vibration Signal
• Acceloremeter Sensor
• Power Spectral

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