An ultrasound-scanning in vivo light source

Area of Science:

• Biomedical Engineering
• Neuroscience
• Materials Science

Background:

• Existing biointerfaces lack spatiotemporal precision for deep-tissue optical control.
• Dynamic targeting of specific biological regions without collateral disturbance remains a challenge.

Purpose of the Study:

• To develop a novel, non-invasive deep-tissue light source for precise optical control in biological systems.
• To demonstrate the programmability and functionality of ultrasound-guided mechanoluminescent nanotransducers for *in vivo* applications.

Main Methods:

• Utilized focused ultrasound (FUS) to scan circulating mechanoluminescent nanotransducers (MLNTs) within the vasculature.
• Validated the system in tissue phantoms and animal models, including opsin-expressing neurons.
• Employed electrophysiological recordings and immunostaining for functional assessment.

Main Results:

• Achieved tunable spatial resolution and dynamic light patterning *in vivo*.
• Demonstrated successful 3D brain targeting and temporally resolved behavioral control in freely moving animals.
• Validated the non-invasive nature of the FUS-MLNT approach.

Conclusions:

• The FUS-scanning MLNT system provides a versatile, non-invasive deep-tissue light source.
• This technology enables precise, dynamic optical interfacing throughout the body.
• Offers a new strategy for advanced biological research and therapeutic interventions.