Abstract
The Magneto-acoustic Tomography with Current Injection (MAT-CI) is a new biological electrical impedance imaging technique that combines Electrical Impedance Tomography (EIT) with Ultrasonic Imaging (UI), which possesses the non-invasive and high-contrast of the EIT and the high-resolution of the UI. The MAT-CI is expected to acquire high quality image and embraces a wide application. Its principle is to put the conductive sample in the Static Magnetic Field(SMF) and inject a time-varying current, during which the SMF and the current interact and generate the Lorentz Force that inspire ultrasonic signal received by the ultrasonic transducers positioned around the sample. And then according to related reconstruction algorithm and ultrasonic signal, electrical conductivity image is obtained. In this paper, a forward problem mathematical model of the MAT-CI has been set up to deduce the theoretical equation of the electromagnetic field and solve the sound source distribution by Green’s function. Secondly, a sound field restoration by Wiener filtering and reconstruction of current density by time-rotating method have deduced the Laplace’s equation that caters to the current density to further acquire the electrical conductivity distribution image of the sample through iteration method. In the end, double-loop coils experiments have been conducted to verify its feasibility.
Highlights
At present, structure imaging is relatively mature in medical imaging for clinical use
Its principle is to put the conductive sample in the Static Magnetic Field(SMF) and inject a time-varying current, during which the SMF and the current interact and generate the Lorentz Force that inspire ultrasonic signal received by the ultrasonic transducers positioned around the sample
A forward problem mathematical model of the Magneto-acoustic Tomography with Current Injection (MAT-CI) has been set up to deduce the theoretical equation of the electromagnetic field and solve the sound source distribution by Green’s function
Summary
Structure imaging is relatively mature in medical imaging for clinical use. Towe B C is the first researcher who has conducted the research on the MATCI, who put forward a bioelectric currents detecting method through electromagnetic coupling and prove the feasibility of this method through experiment [3]. It was not until 2010 that the Chinese Academy of Medical Sciences and the Institute of Electrical Engineering of the Chinese Academy of Sciences conducted researches on the MAT-CI [4] [5] [6]. This paper conducts systematic research on the theory system of the MAT-CI, focuses on the axial symmetry model, verifies the feasibility in the field of electrical impedance tomography through experimentation and simulation
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