Progress in Medical Physics (한국의학물리학회지:의학물리)
- Volume 18 Issue 3
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- Pages.172-178
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- 2007
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- 2508-4445(pISSN)
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- 2508-4453(eISSN)
Ultrasonic Bone Densitometer by Measuring the Speed of Sound
SOS를 이용한 초음파 골밀도 측정 장치
- Jung, Min-Sang (Medical Laser and Device Reserch Center/Department of Physics, Dankook University) ;
- Hahn, Eun-Joo (Department of Physics, University of Suwon) ;
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Kim, Yeong-Sik
(Medical Laser and Device Reserch Center/Department of Physics, Dankook University)
- Published : 2007.09.30
Abstract
An ultrasonic bone densitometer has been developed by measuring speed of sound signal transmitted and received on the skin, not through the horizontal axis but through the vertical one in tissue. The SOS(speed of sound) method measuring the time difference between the ultrasound signals reflected from the both sides of surface of bone could produce more precise result compared with the BUA(broadband ultrasound attenuation) method measuring the frequency difference. Middle finger is selected to be the best measurement position in order to increase the accuracy, after due consideration that the thickness of flesh at the down part of thumb shows too much variation although the ratio of the receiving signal is higher than the other fingers. The measured value by using SOS method shows almost the same result as compared with the conventional DEXA method.
가로축 방식이 아닌 세로축 방식으로 초음파를 송수신하여 골밀도 측정을 하는 장치를 개발하였다. 반사된 초음파의 시간 차이를 이용하는 speed of sound (SOS) 방식은 주파수 차이를 비교하는 broadband ultrasound attenuation (BUA) 방식에 비하여 더욱 정확한 결과를 얻을 수 있다. 측정부위의 경우 엄지는 초음파 수신율이 좋으나 피부 두께의 변위가 많은 단점을 고려하여 중지를 채택하여 정확성을 높였다. SOS 방식만을 사용하여 측정한 결과 기존의 dual-energy x-ray absorptiometry (DEXA) 방식과 비교하여 거의 동일한 정확도를 얻을 수 있었다.