【摘要】：為了完善磁感應(yīng)磁聲成像算法,使其在真實聲檢測系統(tǒng)下都適用,研究聲換能器特性對磁感應(yīng)磁聲成像重建效果的影響。依據(jù)換能器聲場分布測量數(shù)據(jù),采用插值方法建立真實聲換能器三維聲場分布模型,利用格林函數(shù)法及離散化方法建立磁感應(yīng)磁聲成像正逆問題算法。為了驗證該算法,分別采用球掃描和柱掃描方式進(jìn)行仿真。基于S-L CT仿真模型建立三維仿體電導(dǎo)率模型,用有限元方法對瞬態(tài)電磁場進(jìn)行分析,根據(jù)計算的渦流分布結(jié)果,使用Matlab進(jìn)行數(shù)值計算。仿真結(jié)果表明:該算法可基本重建出原始力源的分布,重建圖像的相關(guān)系數(shù)分別達(dá)到98.49%和94.96%,對一般聲換能器比較適用。該研究為進(jìn)一步的實驗研究和實驗重建的精確性提供理論依據(jù)。
[Abstract]:In order to perfect the magnetoinductive magnetoacoustic imaging algorithm and make it applicable to the real acoustic detection system, the influence of acoustic transducer characteristics on the reconstruction effect of magnetic induction magnetoacoustic imaging is studied. Based on the measured data of acoustic field distribution of transducer, the three-dimensional sound field distribution model of real acoustic transducer is established by interpolation method, and the forward and inverse problem algorithm of magnetoinductive magnetoacoustic imaging is established by Green's function method and discretization method. In order to verify the algorithm, the spherical scanning and column scanning are used for simulation. Based on the simulation model of S-L CT, the three-dimensional conductivity model is established. The transient electromagnetic field is analyzed by finite element method. According to the calculated results of eddy current distribution, Matlab is used to carry out the numerical calculation. The simulation results show that the algorithm can basically reconstruct the distribution of the original force source, and the correlation coefficient of reconstructed images reaches 98.49% and 94.96% respectively, which is more suitable for general acoustic transducers. This study provides theoretical basis for further experimental research and accuracy of experimental reconstruction.
【作者單位】： 中國醫(yī)學(xué)科學(xué)院北京協(xié)和醫(yī)學(xué)院生物醫(yī)學(xué)工程研究所;
【基金】：國家自然科學(xué)基金重點項目(51137004);國家自然科學(xué)基金面上項目(81171424) 天津市自然基金青年基金(13JCQNJC14000)
【分類號】：R318
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本文編號：2169627