北京生物醫(yī)學(xué)工程

巴克碼在超聲測量松質(zhì)骨BUA中的應(yīng)用_________

Application of Barker code in the measurement of broadband ultrasound attenuation of cancellous bone

作者：周建帆彭虎王東亞張雷剛

單位：           中國科學(xué)技術(shù)大學(xué)信息學(xué)院電子科學(xué)與技術(shù)系(合肥230027)    

關(guān)鍵詞：巴克碼；定量超聲技術(shù)；骨礦密度；寬帶超聲衰減

分類號：

出版年·卷·期（頁碼）：2013·32·1（33-37）

摘要：

目的定量超聲技術(shù)是通過測量骨骼的寬帶超聲衰減(broadband ultrasound attenuation,BUA)等參數(shù)以反映骨骼骨礦密度的方法。然而由于骨骼對超聲波的嚴重衰減，接收到的透射信號非常微弱且伴有強噪聲，從而限制了超聲的測量深度。為消除噪聲影響，提高測量深度，本文提出將巴克碼應(yīng)用于測量松質(zhì)骨BUA。方法采用巴克碼調(diào)制脈沖發(fā)射信號，利用巴克碼尖銳的自相關(guān)特性對接收信號進行脈沖壓縮，然后用壓縮脈沖的頻譜分析松質(zhì)骨的BUA值。結(jié)果通過仿真和樣品實測結(jié)果發(fā)現(xiàn)該方法相對于傳統(tǒng)方法具有更好的抗干擾能力，及更平穩(wěn)的BUA衰減曲線，從而得到更精確的測量結(jié)果。結(jié)論本方法既能提高松質(zhì)骨BUA的測量精度,又能增大測量深度。

Objective Quantitative ultrasound (QUS) is a measurement method of bone mineral density (BMD),by measuring broadband ultrasound attenuation (BUA) to reflect cancellous bone BMD.However,the received signals are always very weak and accompanied by strong noise because ultrasonic wave is seriously attenuated by cancellous bone,which limits the measurement depth.In order to reduce the impact of noise to improve the measurement depth,this paper proposes a method which applies Barker code to measure BUA of cancellous bone.Methods We use Barker code to modulate the transmitting pulse signals,and compress the received signals with the sharp correlation property of Barker code.The compressed pulse spectra are used to analysis BUA of cancellous bone.Results Through simulation and sample measurement,the results show that this method has better anti-jamming capability,smoother BUA attenuation curve,which lead to more accurate measurement results compared to traditional methods.Conclusions This method can improve not only the measurement accuracy but also the measurement depth of the cancellous bone’s BUA.

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