What is it about?
Reading temperature inside organs with light is hard because tissue dims and warps the signal. We injected superbright silver sulfide nanoparticles that act like tiny light-up thermometers. After briefly heating the liver with near-infrared light, we tracked how the signal recovered as it cooled. By matching this cooling curve with computer heat simulations, we read liver heating up to about 8 °C.
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Why is it important?
Most optical nanothermometers cannot give absolute temperature deep in tissue without re-calibration. Our approach uses the cooling time course plus computer simulations, so tissue distortion matters less. It also enables 2D thermal maps of an internal organ during laser heating. We could estimate deposited heat and separate tissue heating from nanoparticle heating in the same experiment. This can support safer, better-controlled thermal therapies and more reliable studies of organ heat regulation.
Perspectives
I was most compelled by turning a distorted brightness signal into an absolute temperature readout. The key choice was to rely on the liver’s cooling dynamics, not the raw intensity, and couple it to a realistic model. Using very bright silver sulfide “superdots” made the in vivo signal strong enough for pixel-by-pixel analysis. Next, I want to refine the simulations with subject-specific anatomy and apply the method to other deep organs. More broadly, this could help guide energy dosing whenever heating must be effective yet avoid hidden damage.
Dr Daniel Ortega
Universidad de Cadiz
Read the Original
This page is a summary of: Reaching Deeper: Absolute In Vivo Thermal Reading of Liver by Combining Superbright Ag2S Nanothermometers and In Silico Simulations, Advanced Science, March 2021, Wiley,
DOI: 10.1002/advs.202003838.
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