Multichannel near-infrared brain functional imaging parallel detection system

Abstract

The invention belongs to the field of optical parameter measurement in tissue optical research, and relates to a multichannel near-infrared brain functional imaging parallel detection system, which comprises a light source part, a brain detection part, a detector part, a multifunctional number phase locking detection circuit and a computer. The light source part comprises a plurality of light source units, each group of unit comprises two steady state semiconductor lasers with different wave lengths, digital-to-analogue conversion and filter circuits and current controllers of the two steady state semiconductor lasers, a wavelength division multiplexer and light optical fibers, wherein the light which is produced by the two lasers driven by the current controllers thereof passes by the wavelength division multiplexer, and then passes by the light optical fibers to be fed to the brain detection part; the brain detection part comprises a plurality of optical seats, and the optical seats are connected with one another through link belts to form a netty passage; and all the light optical fibers are connected onto different optical seats. The invention combines the single photon counting technology with the phase locking detection technology, not only the quick imaging requirement is benefited, but also the wide dynamic range requirement is satisfied.

Description

technical field [0001] The invention relates to an optical imaging system in the field of human body information detection, in particular to a device for realizing a multi-channel near-infrared light imaging system for brain function research based on single-photon counting digital phase-locking technology. technical background [0002] The in vivo study of brain function is of great significance, and its application involves scientific research and clinical diagnosis and treatment. [0003] Current noninvasive methods for studying brain function mainly include functional magnetic resonance (fMRI), positron emission tomography (PET), electroencephalography (EEG), event-related potential (ERP), magnetoencephalography (MEG) and optical imaging methods ( NIRS). NIRS uses light of more than two wavelengths (in the 600-900nm band) to perform multi-point irradiation in a predetermined area of ​​the scalp. Due to the deep penetration ability of near-infrared light, and the oxyhemo...

AI Technical Summary

Problems solved by technology

In order to avoid the problem of the small dynamic range of the measurement system, the ETG system of Hitachi Corporation of Japan increases the number of source points and detection points, but this brings the complexity and high price of the system

The CW5 system uses the method of turning on the light source in time, but it can only detect light within 19-42.5mm, and the time resolution of the system is greatly reduced

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