Multi-channel parallel near infrared spectrum imaging system

A near-infrared spectroscopy and imaging system technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problem of inability to meet the requirements of near-infrared data acquisition, inability to utilize near-infrared spectroscopy imaging technology, and uneven surface sensitivity of photocathode and other issues, to achieve the effect of reasonable and effective channel arrangement, simple and efficient structure, and low manufacturing and use costs

Active Publication Date: 2013-06-19
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

Among them, the photomultiplier tube has disadvantages such as high cost, large volume, and poor mechanical shock resistance, and the uneven sensitivity of the photocathode surface and the phenomenon of "fatigue" will lead to unreliable data collection
Ordinary photodiodes cannot complete weak light signals due to low sensitivity, especially in the detection of light signals scattered by the brain in the NIRS system
[0005] In addition, the Chinese patent application CN201110286531.8 an

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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] figure 1 Shown is the general block diagram of the system, and the invention includes a precise control part, a multi-channel LED light source emission part with different wavelengths, a high-efficiency photoelectric conversion part, a high-resolution channel demodulation part and a post-processing part. First, the control part sends a signal to determine the power and frequency emitted by the light source, and at the same time completes the modulation of the electrical signal of the corresponding channel to generate a square wave signal of the required frequency. The transmit power and frequency are both flexible and adjustable. The light source emitting part emits near-infrared light with constant power and freq...

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Abstract

The invention discloses a multi-channel parallel near infrared spectrum imaging system. A multi-wavelength light emitting diode (LED) is applied to finishing emission of near-infrared light. An avalanche photodiode is used for detecting a weak optical signal, the simulating lock-in amplifier technology is used for achieving amplification of the signal, and a near infrared spectrum cerebral function imaging helmet disclosed in Chinese patent application CN200520002784.8 can be used for improving the partial unreasonable design of a self-adaptation head portion. The multi-channel parallel near infrared spectrum imaging system can achieve continuous rapid accurate detection and collection of cerebral blood oxygen signals, overcomes the defect of an existing functional near infrared system, and brings superiority of the near infrared spectrum imaging technology compared with other cerebral function imaging technologies into full play.

Description

technical field [0001] The invention relates to the field of medical imaging, and in particular to a multi-channel brain function near-infrared spectral imaging system based on phase-sensitive detection technology. Background technique [0002] As representatives of brain functional imaging techniques, technologies such as functional magnetic resonance imaging (fMRI), positron emission tomography (PET) and electroencephalography (EEG) play an important role in the field of brain function research and the diagnosis and treatment of brain diseases. The disadvantages of high cost, low time resolution, restrictions on subjects or patients, and possible side effects limit the application of these techniques. Near-infrared spectral imaging (NIRS) has become an important part of brain functional imaging technology due to its advantages of low cost, high time resolution, no side effects, and no restrictions on subjects or patients. Foreign near-infrared spectral imaging technology ...

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Application Information

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IPC IPC(8): A61B5/1455
Inventor 张鑫左年明蒋田仔徐文廷
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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