A novel method for fast imaging of brain function, non-invasively, with light

Area of Science:

• Biomedical optics
• Medical physics
• Neuroimaging

Background:

• Non-invasive human body imaging is a key goal in physics and medicine.
• Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET) have achieved success in brain imaging.
• Previous near-infrared spectroscopy (NIRS) studies focused on non-imaging brain responses.

Purpose of the Study:

• To develop and demonstrate a novel 2D imaging technique for functional brain activation using NIRS.
• To evaluate the method's effectiveness in adults and neonates.
• To provide a portable and affordable alternative to MRI and PET.

Main Methods:

• Utilized multiple source-detector combinations (nine sources, four detectors) with modulated light.
• Employed simple back-projection algorithms for image reconstruction.
• Achieved imaging of sensorimotor and cognitive activation.

Main Results:

• Successfully imaged pre-frontal and parietal stimulation in adults and neonates.
• Obtained 2D images with spatial resolution < 1 cm.
• Achieved imaging times of less than 30 seconds.
• Demonstrated sensitivity for small object detection using amplitude and phase cancellation.

Conclusions:

• The developed NIRS-based method enables rapid, high-resolution 2D functional brain imaging.
• This technique is suitable for evaluating adult and neonatal cerebral dysfunction.
• It offers a simple, portable, and affordable solution compared to MRI and PET, without requiring immobilization.