New ultrasound technique can 'see' inside live cells

Researchers have developed a new technique that uses sound rather than light to see inside live cells, an advance that may have potential applications in stem-cell transplants and cancer diagnosis.
The technique uses shorter-than-optical wavelengths of sound and could even rival the optical super-resolution techniques which won the 2014 Nobel Prize for Chemistry, researchers said.
This new kind of sub-optical phonon (sound) imaging provides invaluable information about the structure, mechanical properties and behaviour of individual living cells at a scale not achieved before.
"People are most familiar with ultrasound as a way of looking inside the body - in the simplest terms we have engineered it to the point where it can look inside an individual cell," said Professor Matt Clark from the University of Nottingham in the UK.

In optical microscopy, the size of the smallest object you can see is limited by the wavelength of light.
For biological specimens, the wavelength cannot go smaller than that of blue light because the energy carried on photons of light in the ultraviolet (and shorter wavelengths) is so high it can destroy the bonds that hold biological molecules together damaging the cells.

Optical super-resolution imaging also has distinct limitations in biological studies.
This is because the fluorescent dyes it uses are often toxic and it requires huge amounts of light and time to observe and reconstruct an image which is damaging to cells.

Unlike light, sound does not have a high-energy payload. This has enabled the researchers to use smaller wavelengths and see smaller things and get to higher resolutions without damaging the cell biology.
"A great thing is that, like ultrasound on the body, ultrasound in the cells causes no damage and requires no toxic chemicals to work. Because of this we can see inside cells that one day might be put back into the body, for instance as stem-cell transplants," said Clark.
The study was published in the journal Scientific Reports.