Electric conductivity rebuilding method for magnetocaloric acoustical imaging

A magneto-thermoacoustic and electrical conductivity technology, which is applied in the directions of acoustic wave diagnosis, infrasonic wave diagnosis, ultrasonic/sonic wave/infrasonic wave diagnosis, etc. It can solve the problem that the conductivity distribution cannot be given

Active Publication Date: 2015-04-01
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that the existing magneto-thermoacoustic imaging method cannot provide the distribut...

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  • Electric conductivity rebuilding method for magnetocaloric acoustical imaging
  • Electric conductivity rebuilding method for magnetocaloric acoustical imaging
  • Electric conductivity rebuilding method for magnetocaloric acoustical imaging

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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 magneto-thermoacoustic signal acquisition device involved in the reconstruction method of the present invention mainly includes four parts: an excitation system, a detection system, a control system and a conductive object 4 . The excitation system includes a pulse excitation source 1 and an excitation coil 3, the pulse excitation source 1 and the excitation coil 3 are isolated from the coupling agent 5 by air, the pulse excitation source 1 is electrically connected to the excitation coil 3, and the excitation coil 3 It can be Helmertz coils that appear in pairs, or a single coil. In order to ensure the uniformity of electromagnetic excitation in the imaging area, it is preferably a Helmertz coil; the detection system includes ultrasonic transducer 6, ultrasonic signal processing , the acquisition subsystem 8 and the host computer 9,...

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Abstract

The invention relates to an electric conductivity rebuilding method for magnetocaloric acoustical imaging. The electric conductivity rebuilding method is based on a magnetocaloric acoustical imaging principle. An exciting coil is used for exerting MHz current excitation on a conducting object, joule heat is generated in the conducting object, and further, ultrasonic signals are generated. An ultrasonic transducer is used for receiving the ultrasonic signals, the received ultrasonic signals are processed and collected, and then, an electric conductivity image of the conducting object is obtained by adopting an electric conductivity image rebuilding algorithm. The electric conductivity rebuilding method comprises the concrete steps that 1, firstly, high-signal-to-noise-ratio magnetocaloric acoustical signals are obtained; 2, the obtained magnetocaloric acoustical signals are used for rebuilding to obtain thermal sound source distribution of the conducting object; 3, the thermal sound source distribution and a one-order magnetic vector space component are used, and a non-linear finite element solution method is adopted for rebuilding a scalar potential space component; 4, the rebuilt scalar potential space component is used for rebuilding the electric conductivity.

Description

technical field [0001] The invention relates to a method for reconstructing conductivity images, in particular to a method for reconstructing conductivity for magneto-thermoacoustic imaging. 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 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 resolution, and the other provides contrast. , achieving simultaneous improvements in contrast and resoluti...

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Application Information

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IPC IPC(8): A61B5/053A61B8/00
CPCA61B5/0093A61B5/053A61B8/0833
Inventor 刘国强夏慧夏正武李士强杨延菊刘宇
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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