中国物理B ›› 2015, Vol. 24 ›› Issue (1): 14302-014302.doi: 10.1088/1674-1056/24/1/014302
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
孙晓冬a, 王欣a, 周雨琦a, 马青玉a b, 章东b
Sun Xiao-Dong (孙晓冬)a, Wang Xin (王欣)a, Zhou Yu-Qi (周雨琦)a, Ma Qing-Yu (马青玉)a b, Zhang Dong (章东)b
摘要:
Based on the acoustic radiation theory of a dipole source, the influence of the transducer reception pattern is studied for magnetoacoustic tomography with magnetic induction (MAT-MI). Numerical studies are conducted to simulate acoustic pressures, waveforms, and reconstructed images with unidirectional, omnidirectional, and strong directional transducers. With the analyses of equivalent and projection sources, the influences of the model dimension and the layer effect are qualitatively analyzed to evaluate the performance of MAT-MI. Three-dimensional simulation studies show that the strong directional transducer with a large radius can reduce the influences of equivalent sources, projection sources, and the layer effect effectively, resulting in enhanced pressure and improved image contrast, which is beneficial for boundary pressure extraction in conductivity reconstruction. The reconstructed conductivity contrast images present the conductivity boundaries as stripes with different contrasts and polarities, representing the values and directions of the conductivity changes of the scanned layer. The favorable results provide solid evidence for transducer selection and suggest potential practical applications of MAT-MI in biomedical imaging.
中图分类号: (Acoustical measurement methods in biological systems and media)