Time-domain reconstruction for thermoacoustic tomography in a spherical geometry
Time-domain reconstruction for thermoacoustic tomography in a spherical geometry
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DOI：
10.1109/tmi.2002.801176
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发表时间：
2002-07-01
影响因子：
10.6
通讯作者：
Wang, LHV
中科院分区：
文献类型：
--
作者：
Xu, MH;Wang, LHV
提出了一种基于重构的球面结构微波热声层析成像方法。利用安装在样品球面上的宽带非聚焦超声换能器测量了微波脉冲激励下生物组织样品中的热声波。从不同的方向获得了足够的数据来重建微波吸收分布。推导出了精确的重建解，并将其近似为改进的反投影算法。实验表明，重建图像与原始样本吻合较好。该系统的空间分辨率达到0.5 mm。
Reconstruction-based microwave-induced thermoacoustic tomography in a spherical configuration is presented. Thermoacoustic waves from biological tissue samples excited by microwave pulses are measured by a wide-band unfocused ultrasonic transducer, which is set on a spherical surface enclosing the sample. Sufficient data are acquired from different directions to reconstruct the microwave absorption distribution. An exact reconstruction solution is derived and approximated to a modified backprojection algorithm. Experiments demonstrate that the reconstructed images agree well with the original samples. The spatial resolution of the system reaches 0.5 mm.