【摘要】：為了探究運(yùn)用現(xiàn)有的激勵(lì)及檢測(cè)技術(shù)實(shí)現(xiàn)區(qū)域彈性成像的可行性,以及在聲輻射力脈沖激勵(lì)下,聚焦形狀、檢測(cè)點(diǎn)的空間位置等因素對(duì)局部剪切波速度估算的影響,運(yùn)用Filed II以及有限元方法對(duì)聲輻射力及組織響應(yīng)情況進(jìn)行了研究,并選用時(shí)域互相關(guān)方法對(duì)局部剪切波速度進(jìn)行估計(jì)。結(jié)果表明,隨著檢測(cè)靈敏度的提高,可以實(shí)現(xiàn)發(fā)射2~3次激勵(lì)脈沖即可對(duì)檢測(cè)組織進(jìn)行區(qū)域成像;使用現(xiàn)有的剪切波速度估計(jì)方法,淺表處與焦點(diǎn)深度處的剪切波速度估計(jì)值相差可達(dá)12.7%;f-number(聚焦深度/孔徑)增大,可以增大成像面積,但是剪切波速度估計(jì)的準(zhǔn)確性降低。鑒于此,提出波速修正算法,修正后波速估計(jì)值更接近理論值。以f-number為1.3為例,修正后的平均誤差由3.2%降至0.6%。結(jié)果證明,現(xiàn)有的聲輻射力激勵(lì)及修正后的剪切波速度估計(jì)方法可用于區(qū)域彈性成像。
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[Abstract]:In order to explore the feasibility of using the existing excitation and detection technology to realize regional elastic imaging, and the influence of focusing shape and spatial position of the detection point on the estimation of local shear wave velocity under the excitation of acoustic radiation force pulse, the acoustic radiation force and tissue response are studied by Filed II and finite element method, and the time domain cross-correlation method is used to estimate the local shear wave velocity. The results show that with the increase of detection sensitivity, the regional imaging of the detection tissue can be carried out by transmitting 2 鈮，

本文編號(hào)：2510877