System and method of magnetosonic impedance imaging based on lorentz force mechanic effect

Abstract

A system and a method of magnetosonic impedance imaging based on a lorentz force mechanic effect comprise an ultrasonic driving excitation source, an ultrasonic probe array, a control system, a magnet system, a direct current power supply and a signal detecting processing system. The ultrasonic probe array is in an emitting or measuring mode through the control system. The direct current power supply is in a connected or disconnected state through the control system so as to achieve two modes of exerting a magnetic field or withdrawing a magnetic field. Mass point vibration speed ratio under a magnetic field condition or a non-magnetic field condition is measured, and a conductivity image is rebuilt according to a square root of the vibration speed ratio. The imaging method does not require electric field measurement, only sound wave signals are required to be measured, a corresponding relation between measured signals and conductivity is simple and clear, and fast image rebuilding is facilitated.

Description

technical field [0001] The invention relates to a medical imaging method and device, in particular to a magnetoacoustic electrical impedance imaging method and device. Background technique [0002] The sensitivity and spatial resolution of traditional electrical impedance imaging are not high. In order to solve this problem, various new imaging methods have been proposed. Magnetoacoustoelectric imaging is a new medical imaging method with good application prospects. The imaging principle is to inject a beam of ultrasonic waves into the imaging body, and the local ions in the imaging body vibrate with the propagation of the ultrasonic waves. The vibrating ions are subjected to the Lorentz force under the action of the static magnetic field, causing charge separation, and then forming The local electric field is used to reconstruct the electrical impedance image by detecting electrical signals through the receiving electrode attached to the imaging body or the receiving coil ...

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Problems solved by technology

[0004] The above imaging method has potential advantages in improving sensitivity and spatial resolution, but it needs to use electrodes or receiving coils to measure electrical signals during the detection process, and the relationship between electrical signals and conductivity is nonlinear, which increases the complexity of the image reconstruction process

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