Shalom Life | August 04, 2015

Israeli Scientists Find Way to See Through Skin Using Light

Scientists in Israel have found a novel way to get images through "scattering" materials such as frosted glass or even skin, or even "see around corners".

By: David Shear

Published: July 19th, 2012 in Health » Israel

Israeli Scientists Find Way to See Through Skin Using Light

Scientists in Israel have found a novel way to get images through scattering materials, such as frosted glass.

Much research in recent years has focused on correcting for scattering, mostly for medical applications. But the new trick, reported in Nature Photonics, is quick, simple and uses natural light rather than lasers.

It uses what is called a spatial light modulator to “undo” the scattering that makes objects opaque or non-reflecting.

Natural light vs. laser pulses

The prototype device was just one of a great many research efforts trying to crack the problem of scattering. But for some applications, the “time-of-flight” approach that the laser-based camera uses is not sufficient.

“If you want to look to see an embryo developing inside an egg but the eggshell scatters everything, or you want to look through the skin, scattering is the main enemy there, and time-of-flight is not a good solution,” explained senior author of the study Yaron Silberberg, Weizmann Institute of Science in Israel.

For those kinds of problems, Prof Silberberg and colleagues at the Weizmann Institute of Science in Israel have pushed the limits of what spatial light modulators (SLMs) can do.

SLMs modify what is known as the phase of an incoming light beam. Like a series of waves on the ocean that run over rocks or surfers, the waves in light can be slowed down or redirected when they hit scattering materials.

SLMs are made up of an array of pixels that can correct for this by selectively slowing down some parts of the beam and allowing others to pass untouched – when an electric field is applied to a pixel, it changes the speed at which light passes through it.

Prof Silberberg and his team first set up their SLM by shining light from a normal lamp through a highly scattering plastic film and allowing a computer to finely tune the SLM until they could see a clear image of the lamp through the film.

Keeping the SLM set this way, they were then able to obtain clear images of other objects through the film – the SLM effectively turns the film back into a clear sheet.

“What we have shown is that you don’t need lasers – everybody else was doing this with lasers, and we showed you can do it with incoherent light from a lamp or the Sun – natural light,” Prof Silberberg told BBC News.

Reflections

But the team then realized that the same approach can work in reflection – that is, not passing through a scattering material but bouncing off of it, such as the case of light bouncing off a wall at a corner.

They then showed the procedure works just as well when the light from an object bounces off a piece of paper; the SLM could “learn” how to undo the paper’s scattering effect, making it a nearly perfect reflector.

As Prof Silberberg puts it: “You can take a piece of wall and effectively turn it into a mirror, and this is the part that makes everybody raise an eyebrow.”

However, he said that the primary use for the technique would be in biological and medical studies – especially tackling the highly scattering white brain matter in neurological imaging – rather than the business of seeing through thin materials or around corners.

This article first appeared on The Times of India

Israel Donates Medical Aid to Taipei Water Park Victims Israel Donates Medical Aid to Taipei Water Park Victims TrendingIsraeli Pharmacies to Carry Marijuana Israeli Pharmacies to Carry Marijuana TrendingIsraeli Startup Using Bugs to Tackle World Hunger Israeli Startup Using Bugs to Tackle World Hunger Trending
 

Israel Wins 61 Medals in Special Olympics

August 03, 2015 | By Avraham Teshuva, Lea Schneider
Israel Wins 61 Medals in Special Olympics

Of the medals won in Los Angeles, 25 are gold, 18 silver and 18 bronze

Read More

Reports: Kanye West is Performing in Israel

August 03, 2015 | By Daniel Koren
Reports: Kanye West is Performing in Israel

Yeezus is in talks with Israeli producers to perform in Tel Aviv this fall

Read More

Ohio University Wipes Out Holocaust Song from Playbook

August 03, 2015 | By Maria Cruz
Ohio University Wipes Out Holocaust Song from Playbook

Ohio State University takes inappropriate song out of marching band songbook

Read More

Jason Segel Opens Up About Growing Jewish (and Christian)

August 03, 2015 | By Maria Cruz
Jason Segel Opens Up About Growing Jewish (and Christian)

The comedian sits down with Marc Maron to discuss his childhood

Read More

New Documentary Claims the Nazis Built Flying Saucers and the Atomic Bomb

August 03, 2015 | By B. Shane Morganstein
New Documentary Claims the Nazis Built Flying Saucers and the Atomic Bomb

Doc cites Nazi and Russian reports that they believe proves the existence of Nazi-made flying saucers and atom bombs

Read More

Anti-Violence Rallies Taking Place Across Israel Today

August 01, 2015 | By Noam 'Dabul' Dvir, Roi Yanovsky, Ahiya Raved, and Gilad Morag
Anti-Violence Rallies Taking Place Across Israel Today

Following two blood-soaked days, in which a Palestinian infant was killed and his parents and sibling were critically wounded in a fire and six people were hurt in a stabbing at Jerusalem's gay pride parade, thousands are expected to protest in Tel Aviv, Jerusalem, and Haifa

Read More

Report: 53% Rise in Anti-Semitic Incidents in the UK

August 01, 2015 | By B. Shane Morganstein
Report: 53% Rise in Anti-Semitic Incidents in the UK

Government officials are speaking out against anti-Semitism after new report finds rapid increase in anti-Semitic incidents

Read More

Film to be Made about Jonathan Pollard

August 01, 2015 | By B. Shane Morganstein
Film to be Made about Jonathan Pollard

The American jailed for passing sensitive information to Israel will have his story adapted for the big screen

Read More

More Headlines