Method and device for biological tissue photoacoustic tomography

A photoacoustic tomography, biological tissue technology, applied in echo tomography, acoustic wave diagnosis, infrasound wave diagnosis and other directions, can solve the complex reflection, transmission and absorption of laser sound field, it is difficult to obtain the exact photoacoustic signal of each point, the amount of calculation large problems, to achieve the effect of good applicability, improved signal-to-noise ratio, and simple algorithm
CN1433739AInactive Publication Date: 2003-08-06SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2003-08-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The biological tissue photoacoustic tomography method includes the following steps: (1). making pulse laser come into the biological tissue to produce photoacoustic signal; (2). making a beam of detection focus ultrasonic wave come into the photoacoustic zone, and interacting with photoacoustic signal to form superposition of the above-mentioned two signal; (3). receiving and measuring the superimposed signal; (4) making frequency spectrum separation by using computer, extracting and storing photoacoustic signal; and (5). making filtering and integration treatment of the photoacoustic signal,and utilizing the leaner projection algorithm to implement tissue chromatographic imaging. Said equipment includes laser, ultrasonic wave generator component, acoustic sgnal measuring component, signal amplifier, data collecting card, three-D electric rotating platform and computer.
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Description

[0001] Technical field The present invention relates to photoacoustic tomography technology, in particular to a method and device for photoacoustic tomography in biological tissue. Background technique

[0002] In recent years, research on the photoacoustic effect and photoacoustic tomography have received increasing attention. When a certain object is irradiated with light, its internal temperature will change due to its absorption of light, which will cause changes in the mechanical parameters of its local area; when a pulsed light source or modulated light source is used, the fluctuation of the local temperature inside the object will cause Its volume expands and contracts, thus radiating sound waves outward. This phenomenon is called photoacoustic field effect (referred to as photoacoustic effect). The photoacoustic effect is actually an energy conversion process. According to the heat conduction equation and wave equation,...

Claims

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