EPFL · Wissenschaft

New Super-Resolution Imaging Technique Captures Live Cell Dynamics

A novel fluorescence microscopy technique called SPIFFI (Spatial Polarization-Induced Fluorescence Fluctuation Imaging) allows researchers to capture super-resolution images of dynamic processes within living cells from a single camera exposure.

Existing super-resolution microscopy methods often require combining many image frames, which blurs the details of rapidly moving cellular structures. SPIFFI overcomes this limitation by utilizing the polarization of fluorescent light emitted by molecules.

The technique splits fluorescent light into four polarization-sensitive channels, comparing the resulting images to reveal hidden structural details. This allows for the visualization of nanometer-scale structures in real-time.

SPIFFI achieves up to a twofold improvement in image resolution, resolving structures around 160–170 nanometers with a single snapshot. This enables the clear imaging of moving mitochondria, microtubules, and cellular fusion or splitting events.

Unlike previous methods that produced one super-resolved frame from many images, SPIFFI generates super-resolved videos of live cells. It can also be integrated with existing methods to achieve resolutions of approximately 80 nanometers.

Researchers are working to make the SPIFFI setup more compact and to combine it with 3D imaging. The technique's compatibility with existing fluorescence microscopes suggests it could become a practical tool for various biological research fields.

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