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Mini-Z: Handheld “T-Ray” Device

February 16th, 2007 Medgadget Editors Diagnostics


T-rays, terahertz (trillion-cycle-per-second) electromagnetic pulses, are getting closer to going clinical/diagnostic, thanks to a recently invented, and now award winning, device:

“T-rays” have been touted as the next breakthrough in sensing and imaging, but the need for bulky equipment has been an obstacle to reaching the field’s potential. Enter Brian Schulkin , winner of the first-ever $30,000 Lemelson-Rensselaer Student Prize. Schulkin has invented an ultralight, handheld terahertz spectrometer — an advance that could help catapult T-ray technology from the lab bench to the marketplace.
Schulkin’s “Mini-Z” is dramatically smaller and lighter than any previous terahertz device, and it already has proven its ability to detect cracks in space shuttle foam, image tumors in breast tissue, and spot counterfeit watermarks on paper currency. The system, which weighs less than five pounds and fits snugly in a briefcase, could open the door to a wide range of applications in homeland security, biomedical imaging, and non destructive testing of industrial components.
Schulkin, a doctoral student in physics at Rensselaer Polytechnic Institute, is the first recipient of the $30,000 Lemelson-Rensselaer Student Prize…
T-rays are useful for imaging defects within materials without destroying the objects or even removing them from their setting, and they offer major advantages over other techniques, according to Schulkin. They can penetrate many dry, non-metallic materials with better resolution than microwave radiation; they don’t pose the same health risks as X-rays; and unlike ultrasound, terahertz waves can provide images without contacting an object.
And T-ray systems offer more than just images: they can provide valuable spectroscopic information about the composition of a material, especially in chemical and biological species. Scientists have been exploring the terahertz region for more than two decades, but one of the main obstacles has been the size and weight of T-ray devices. “Conventional systems are tied down to the bench,” Schulkin said. “They are incredibly heavy, not portable, and require high-powered lasers, which are both expensive and large.”
The Mini-Z, however, is about the size of a laptop computer, and it doesnot require any peripheral equipment. “The first time the Mini-Z was on display, the kinds of comments we got were, ‘Where is the rest of it?'” Schulkin said.
The device also provides real-time data with absolutely no waiting, and its user-friendly design means people do not need special training to operate it. “It’s a turnkey system — all you have to do is open the box, set it up, and turn it on,” Schulkin said. “My vision for the Mini-Z is that it will be standard equipment in offices around the world, or in the lab for research.”
Schulkin’s patent-pending technology is available for licensing, and his team has received interest from a number of companies looking to commercialize the Mini-Z. The potential applications for such a device are numerous: evaluating the integrity of carbon fiber composites used in airplanes; imaging tumors without the need for harmful radiation; detecting explosives at airport security checkpoints; spotting landmines from a distance; and seeing biological agents through a sealed envelope…
The spray-on foam insulation used in the space shuttle is an ideal subject for terahertz imaging, Schulkin said. During the STS-114 shuttle mission in July 2005 , video analysis indicated a piece of foam was lost from the bright orange, 15-story-tall external fuel tank of Space Shuttle Discovery. The tank’s aluminum skin is covered with polyurethane-like foam averaging an inch thick, which insulates the propellants, prevents ice formation on its exterior, and protects its skin from heat during flight, according to NASA.
Schulkin and his colleagues have conducted tests with foam samples provided by NASA’s Marshall Space Flight Center and fuel-tank manufacturer Lockheed Martin Space Systems. To help prove the viability of terahertz imaging, the team purposely embedded defects in specially prepared foam samples, and then they used T-rays to spot them. In one test, a total of eight man-made defects of various sizes were scattered throughout the sample and successfully detected.
A prototype of the Mini-Z is being evaluated by NASA’s External Tank Project Office, which is seeking new methods to either complement or replace those it currently uses in non destructive evaluation.

The announcement…
Flashback: Bringing T-Rays Under Control

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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