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Injection current type thermoacoustic imaging method

A technology of current injection and thermoacoustic imaging, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems of expensive nuclear magnetic resonance electrical impedance imaging equipment, bulky excitation source, large volume, etc., achieving low power and low cost , the effect of high image quality

Active Publication Date: 2017-04-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

Nuclear magnetic resonance electrical impedance imaging equipment is expensive; magnetoacoustic imaging also requires high-power magnetic excitation sources, and there are also problems with bulky excitation sources, high power consumption, and large volume

Method used

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  • Injection current type thermoacoustic imaging method
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  • Injection current type thermoacoustic imaging method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] The principle of the invention is as figure 1 As shown, the excitation source 1 injects current into the target body 4 through the electrode 3 as an excitation, and Joule heat is generated in the target body 4, which causes thermal expansion and generates ultrasonic signals. The ultrasonic signal is detected by the ultrasonic probe array 6, and the acoustic signal is reconstructed according to the detected ultrasonic signal. Source and target bulk conductivity distributions.

[0043] The excitation source 1 injects a current I into the target body 4 through the electrode 3 as a pulse current. The frequency spectrum of the pulse current is below the microwave, mainly distributed within 100MHz. Using a lower frequency will have a deeper imaging depth. For medical imaging applications, according to biological The electrical impedance chara...

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Abstract

The invention provides an injection current type thermoacoustic imaging method. The injection current type thermoacoustic imaging method is characterized by: through an electrode, injecting a current into an imaging target, generating Joule heat in the imaging target body, causing thermal expansion, generating an ultrasonic signal, utilizing an ultrasonic probe to detect the ultrasonic signal, and reconstructing conductivity distribution of a sound source and a target body according to the detected ultrasonic signal. The injection current type thermoacoustic imaging method can be used for electric impedance imaging with high-resolution, and is used for early diagnosis of diseases.

Description

technical field [0001] The invention relates to a thermoacoustic imaging method, in particular to a medical injection current type thermoacoustic imaging method. Background technique [0002] Thermoacoustic imaging is that the target body absorbs energy, generates thermal expansion and generates ultrasonic signals, and uses ultrasound to reconstruct the structure of the target body. Existing thermoacoustic imaging can be divided into photoacoustic imaging, microwave thermoacoustic imaging and magneto-thermoacoustic imaging according to the excitation source. Photoacoustic imaging uses laser light to irradiate the target body, the target body absorbs energy and expands, and then generates ultrasonic signals. The depth of photoacoustic imaging can reach millimeter level. Microwave thermoacoustics is the use of microwaves instead of lasers to irradiate the target. The depth of microwave thermoacoustic imaging can reach centimeter level. Magnetothermal acoustics uses a low-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00
CPCA61B5/0093
Inventor 夏正武李艳红刘国强夏慧杨延菊
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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