A 2D Magneto-Acousto-Electrical Tomography Method to Detect Conductivity Variation Using Multifocus Image Method

被引:21
|
作者
Dai, Ming [1 ,2 ,3 ]
Chen, Xin [1 ,2 ,3 ]
Sun, Tong [1 ,2 ]
Yu, Lingyao [4 ]
Chen, Mian [1 ,2 ,3 ]
Lin, Haoming [1 ,2 ,3 ]
Chen, Siping [1 ,2 ,3 ]
机构
[1] Shenzhen Univ, Hlth Sci Ctr, Sch Biomed Engn, Shenzhen 518060, Peoples R China
[2] Guangdong Key Lab Biomed Measurements & Ultrasoun, Shenzhen 518060, Peoples R China
[3] Natl Reg Key Technol Engn Lab Med Ultrasound, Shenzhen 518060, Peoples R China
[4] Guangdong Inst Med Instruments, Guangzhou 510000, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
multifocus imaging; conductivity distribution; chirp signal excitation; digital signal processing; MAGNETOACOUSTIC TOMOGRAPHY; FORCE; INDUCTION;
D O I
10.3390/s18072373
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
As magneto-acoustic-electrical tomography (MAET) combines the merits of high contrast and high imaging resolution, and is extremely useful for electrical conductivity measurement, so it is expected to be a promising medical imaging modalities for diagnosis of early-stage cancer. Based on the Verasonics system and the MC600 displacement platform, we designed and implemented a MAET system with a chirp pulse stimulation (MAET-CPS) method and a focal probe was utilized for stepscan focus excitation to enhance the imaging resolution. The relevant experiments were conducted to explore the influence of excitation positions of the single-focus point, and the effect of the excitation position on the amplitudes of the conductivity variation was clearly demonstrated. In order to take advantage of the merits of multifocus imaging, we firstly proposed a single focus MAET system with a chirp pulse stimulation (sfMAET-CPS) method and a multifocus MAET system with a chirp pulse stimulation (mfMAET-CPS) method for high-resolution conductivity imaging, and a homogenous gelatin phantom with a cuboid-shaped hole was used to investigate the accuracy of mfMAET-CPS. Comparative experiments were carried out on the same uniform phantom by the sfMAET-CPS and the mfMAET-CPS, respectively. The results showed that: (1) the electrical conductivity distributions of the homogenous phantom with a cuboid-shaped hole were detected by the sfMAET-CPS but were easily affected by the focal point, which demonstrated that the sfMAET-CPS had a low imaging resolution. (2) Compared with the sfMAET-CPS, the imaging effect of the mfMAET-CPS was much better than that of the sfMAET-CPS. (3) A linear interpolation algorithm was used to process the 2D conductivity distribution; it increased the smoothness of the conductivity distribution and improved the imaging effect. The stepscan focus excitation and the linearly frequency-modulated theory provide an alternative scheme for the clinical application of MAET.
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页数:16
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