Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams

A biological tissue and acoustic signal technology, applied in the field of measurement, can solve problems such as poor signal-to-noise ratio, undetectable signal, weak photoacoustic signal, etc., and achieve the effects of easy assembly, improved signal-to-noise ratio, and convenient operation
CN1168980CInactive Publication Date: 2004-09-29SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2004-09-29
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

A method for measuring photoacoustic signals in biological tissue includes emitting laser pulses into biological tissue to generate photoacoustic field, emitting a focused ultrasonic beam into the photoacoustic field to superpose on photocoustic signal and generate its beat signals, receiving and measuring them, separating signal spectrum, and extracting photoacoustic signals. Its apparatus is composed of laser device, ultrasonic generator, sound signal measurer, signal amplifier, data acquisition card, and computer. It can diagnose the lesion of biological tissue with radiactive damage.
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Description

technical field

[0001] The invention relates to measurement technology, in particular to a method for measuring photoacoustic signals of biological tissues with a probe ultrasonic beam.

[0002] The invention also relates to a device for use in a method of measuring photoacoustic signals of biological tissue with a probe ultrasound beam. Background technique

[0003] In recent years, the research and application of the photoacoustic effect has received more and more 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, so it can radiate sound waves outward. This phenomenon is called photoacoustic field effect (referred to as photoacoustic e...

Claims

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