High spatial and temporal resolution wide-field imaging of neuron activity using quantum NV-diamond

Area of Science:

• Neuroscience
• Quantum Sensing
• Biophysics

Background:

• Understanding brain information processing requires quantitative analysis of biological neural networks.
• Current techniques face challenges in achieving subcellular spatial resolution for neural dynamics.
• Non-invasive imaging of neural activity at high resolution is crucial for neuroscience research.

Purpose of the Study:

• To develop a new wide-field imaging method for neuronal networks.
• To achieve high-resolution, non-invasive imaging of neural dynamics.
• To leverage nanoscale magnetic field sensing for brain activity mapping.

Main Methods:

• Utilizing optically active spins in diamond for nanoscale magnetic field sensing.
• Analyzing sensitivity to magnetic fields generated by axon transmembrane potential.
• Experimental validation using electronically generated neuron signals.
• Numerical simulations of transmembrane potential for a hippocampal neuron model.

Main Results:

• Demonstrated sensitivity of the diamond-based system to neural magnetic fields.
• Experimental confirmation of the system's predictions.
• Numerical simulations show capability for non-invasive imaging.
• Achieved millisecond temporal and micron spatial resolution over wide fields.

Conclusions:

• The developed wide-field imaging system offers a promising new tool for neuroscience.
• This technique enables non-invasive visualization of neural network dynamics at high resolution.
• The approach has the potential to advance our understanding of brain function and information processing.