Reception pattern influence on magnetoacoustic tomography with magnetic induction

• Published in: Chinese physics B Vol. 24; no. 1; pp. 329 - 337
• Main Author: 孙晓冬 王欣 周雨琦 马青玉 章东
• Format: Journal Article
• Language: English
• Published: 2015
• Subjects: Boundaries; Computer simulation; Image contrast; Image reconstruction; Magnetic induction; Mathematical models; Projection; Transducers; 三维模拟; 换能器; 接收模式; 断层摄影; 生物医学成像; 磁感应; 辐射理论; 重建图像
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/1/014302

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.