Key Takeaways
1. MIT researchers developed a new microscope technology that can image brain tissue at the individual cell level, surpassing traditional methods.
2. The technology, called “Multiphoton-In and Acoustic-Out,” uses a combination of light and sound to create high-resolution images without external labels.
3. It operates in two phases: first using long-wavelength light to penetrate tissue and stimulate target molecules, then detecting sound waves generated by thermal expansion.
4. The system successfully imaged NAD(P)H in a 1.1-millimeter thick human cerebral organoid, achieving five times the depth of other label-free microscopy techniques.
5. The technology’s lack of chemical or genetic modifications suggests potential clinical applications, such as identifying Alzheimer’s biomarkers during brain surgeries.
A team of researchers from MIT has created a groundbreaking microscope technology that can delve deeper into brain tissue at the level of individual cells compared to traditional microscopes. This innovative system utilizes a unique blend of light and sound to produce high-resolution images without relying on external labels. Their findings are discussed in a paper published in the journal Light: Science and Applications.
Two Main Stages
The new technology, known as “Multiphoton-In and Acoustic-Out,” operates in two main phases. Initially, it employs a powerful, ultra-short burst of long-wavelength light to deeply and accurately penetrate brain tissue. This “three-photon light” stimulates the target molecules found within single cells.
Sound Over Light
In the second phase, rather than detecting the faint fluorescent light emitted by the molecules, the system measures sound. When the light energy is absorbed, it leads to thermal expansion within the cell, generating sound waves that move through the tissue. A highly sensitive ultrasound microphone captures these sounds, and the system then transforms the sound signals into intricate images.
Using this novel system, the researchers successfully imaged NAD(P)H—a molecule linked to cellular metabolism and neuron activity—through a human cerebral organoid that is 1.1 millimeters thick. To provide some context, this capability is five times greater than what other label-free microscopy technologies can achieve.
Future Applications
Since the new system does not require any additional chemicals or genetic modifications, the researchers believe it could eventually be used in clinical environments, such as identifying biomarkers for diseases like Alzheimer’s during brain surgeries. So far, the tests have been conducted in vitro and ex vivo, but the team is now aiming to demonstrate its effectiveness on a living animal.
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