本文選題：彈性成像 + 先驗(yàn)估計(jì)　； 參考：《聲學(xué)學(xué)報(bào)》2016年05期

【摘要】：準(zhǔn)靜態(tài)彈性成像技術(shù)是基于組織壓縮前和壓縮后超聲回波射頻信號進(jìn)行組織運(yùn)動重構(gòu)的彈性成像技術(shù)。提出了一種基于先驗(yàn)估計(jì)的自適應(yīng)窗函數(shù)算法,在位移估計(jì)過程中,使用已估計(jì)的臨近窗的時(shí)延值作為先驗(yàn)信息,自動調(diào)整截取壓縮后射頻信號段的截取窗函數(shù),提高了互相關(guān)運(yùn)算所需的壓縮前和壓縮后信號段之間的相關(guān)性。仿真實(shí)驗(yàn)結(jié)果表明,該算法不僅大大提高了成像速度,而且提高了信噪比較低時(shí)的成像質(zhì)量,同時(shí)該算法具有更寬的應(yīng)變通帶。
[Abstract]:The quasi-static elastic imaging technique is an elastic imaging technique based on the radio-frequency signals of ultrasonic echo before and after tissue compression for tissue motion reconstruction.In this paper, an adaptive window function algorithm based on prior estimation is proposed. In the process of displacement estimation, the estimated time delay of the adjacent window is used as the prior information to automatically adjust the intercepting window function of the truncated RF signal segment.The correlation between pre-compression and post-compression signals required for cross-correlation operation is improved.The simulation results show that the algorithm not only improves the imaging speed, but also improves the imaging quality when the signal-to-noise ratio is low. At the same time, the algorithm has wider strain-pass band.
【作者單位】： 近代聲學(xué)教育部重點(diǎn)實(shí)驗(yàn)室南京大學(xué)聲學(xué)研究所;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2012CB921504) 國家自然科學(xué)基金(11274166) 聲場聲信息國家重實(shí)驗(yàn)室開放課題(SKLA201609)資助
【分類號】：TB559;TN911.7
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本文編號：1766164