基于声换能器特性的三维磁感应磁声成像重建算法
发布时间：2018-08-07 09:42
【摘要】：为了完善磁感应磁声成像算法,使其在真实声检测系统下都适用,研究声换能器特性对磁感应磁声成像重建效果的影响。依据换能器声场分布测量数据,采用插值方法建立真实声换能器三维声场分布模型,利用格林函数法及离散化方法建立磁感应磁声成像正逆问题算法。为了验证该算法,分别采用球扫描和柱扫描方式进行仿真。基于S-L CT仿真模型建立三维仿体电导率模型,用有限元方法对瞬态电磁场进行分析,根据计算的涡流分布结果,使用Matlab进行数值计算。仿真结果表明:该算法可基本重建出原始力源的分布,重建图像的相关系数分别达到98.49%和94.96%,对一般声换能器比较适用。该研究为进一步的实验研究和实验重建的精确性提供理论依据。
[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.
【作者单位】： 中国医学科学院北京协和医学院生物医学工程研究所;
【基金】：国家自然科学基金重点项目(51137004);国家自然科学基金面上项目(81171424) 天津市自然基金青年基金(13JCQNJC14000)
【分类号】：R318
，
本文编号：2169627
[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.
【作者单位】： 中国医学科学院北京协和医学院生物医学工程研究所;
【基金】：国家自然科学基金重点项目(51137004);国家自然科学基金面上项目(81171424) 天津市自然基金青年基金(13JCQNJC14000)
【分类号】：R318
，
本文编号：2169627
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