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Magneto-thermoacoustic tomographic method and system

An imaging method and imaging system technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problem of low detection sensitivity

Active Publication Date: 2015-03-25
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the invention is to overcome the shortcoming of low detection sensitivity in the prior art, and propose a new magneto-thermoacoustic imaging method and imaging system

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  • Magneto-thermoacoustic tomographic method and system

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] The method of the present invention is based on the principle of magneto-thermoacoustic imaging, and by applying linear frequency modulation or pseudo-randomly coded excitation current to the conductive object, an induced electric field is generated inside the conductive object, thereby generating Joule heat, and exciting the thermoelastic ultrasonic signal of the conductive object. By detecting the ultrasonic signal, and using pulse compression technology or other related processing technology to realize the demodulation of the received ultrasonic signal, improve the signal-to-noise ratio of the detection signal of the magneto-thermoacoustic imaging system, and finally reconstruct the conductance by using the inverse problem of the sound field and the electromagnetic field Rate distribution image.

[0035]The excitation current in the m...

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Abstract

Disclosed is a magneto-thermoacoustic tomographic method and system. According to the method, linear frequency modulated magnetic field is applied to a conductive object (7), an induction electric field is generated in the conductive object (7), joule heat is generated, and the conductive object (7) is excited to generate a thermoplastic ultrasonic signal, the thermoplastic ultrasonic signal is detected, and reconstructing of acoustic field and electric field inverse problems is performed to acquire a conductivity distribution image. The system comprises an excitation module, a detection module, a water tank, a control module and an upper computer; the excitation module is mainly composed of a signal generator, a power amplifier and an excitation coil; the detection module is mainly composed of an ultrasonic transducer, a signal conditioning circuit and a signal acquisition circuit; the control module is used for motion control, excitation source control, acquisition control and image reconstruction control; the upper computer is used for implementing an image reconstruction function and a control function of the control module.

Description

technical field [0001] The invention relates to an imaging method and an imaging system thereof. Background technique [0002] At present, the sensitivity and spatial resolution of traditional electrical impedance imaging technology are not high, mainly because electrical impedance imaging usually uses electromagnetic waves with low frequency as excitation. Since the wavelength is much larger than the imaging object, the electromagnetic field detection contrast is high, but the resolution is low. Needless to say, a single field has its physical limitations. Therefore, multi-physics field imaging technology has received more and more attention, that is, one physical field acts on biological tissue and converts it into another physical field for detection. One physical field provides the resolution rate, and the other physical field provides Contrast, which achieves simultaneous improvement of contrast and resolution. The multi-physics imaging technology combining electromag...

Claims

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Application Information

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IPC IPC(8): A61B5/053
CPCA61B5/0093
Inventor 夏慧刘国强夏正武李士强杨延菊刘宇
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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