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NASA Technology Helps Detect and Treat Heart Disease and Strokes

by Medindia Content Team on  June 8, 2007 at 3:19 PM News on IT in Healthcare   - G J E 4
NASA Technology Helps Detect and Treat Heart Disease and Strokes
PASADENA, Calif., June 6 /PRNewswire-USNewswire/ -- NASA space technology is helping doctors diagnose and monitor treatments for hardening of the arteries in its early stages, before it causes heart attacks and strokes.
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Hospitals and doctors around the country are using ArterioVision software initially developed at NASA's Jet Propulsion Laboratory (JPL), Pasadena, Calif., along with a standardized, painless, non-invasive ultrasound examination of the carotid artery, which carries blood from the heart to the brain.

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A standard carotid ultrasound measures plaque and blood flow within the artery. When an ultrasound is used with the software, the test measures the thickness of the inner two layers of the carotid artery -- the intima and media. Medical Technologies International, Inc. (MTI) of Palm Desert, Calif., patented the ArterioVision software.

Arterial thickening provides the earliest evidence of atherosclerosis, or hardening of the arteries, the beginning stage of a disease process that leads to heart disease and stroke. Doctors can use this carotid intima media thickness (CIMT) measurement to calculate the age of the patient's arteries, which does not always match the patient's calendar age.

"You may look and feel one way on the outside, but your arteries actually could be much older than one realizes," said Dr. Howard N. Hodis of the Keck School of Medicine at the University of Southern California, Los Angeles. "Once patients see how thick their arteries are, there is much more incentive for them to change their lifestyle with dietary modification and exercise," he said. "Physicians also can use the test to monitor and change current medications."

The U.S. Food and Drug Administration has approved the new diagnostic tool, called the ArterioVision CIMT procedure. Robert Selzer, MTI chief engineer, worked in JPL's Image Processing Laboratory for 15 years, where the technology was developed that ultimately led to the software used in ArterioVision.

"This is such a precise method of examining the carotid artery. It can distinguish between 256 shades of gray at a subpixel level," Selzer said. "You need that kind of detail to help catch heart disease as early as you can, often before there are any outward symptoms."

During the test, a patient lies on an examination table while a technician applies gel to the neck to image the carotid arteries, located on both sides of the neck near the skin's surface. The technician uses an ultrasound machine while following a patented protocol to capture specific images of the carotid artery wall. Using the ArterioVision software, the physician generates a CIMT measurement and a report that identifies the patient's risk profile when compared to people of the same gender and age.

JPL's Image Processing Laboratory was created in 1966 to receive and make sense of spacecraft imagery. In the lab, the NASA-invented Video Imaging Communication and Retrieval software has been used to process pictures from numerous space missions, including the Voyagers and Mars Reconnaissance Orbiter. Periodic upgrades of the imaging software have enabled greater accuracy and improved knowledge of our solar system, and have laid the groundwork for understanding images of all kinds.

The ArterioVision test was developed with JPL's Innovative Partnerships Program, designed to bring benefits of the space program to the public. "It is exciting to see this NASA-funded technology grow in sophistication over the years and help in the battle against one of the nation's leading health issues," said Ken Wolfenbarger, Innovative Partnerships Program manager at JPL. The American Heart Association says heart disease is the leading cause of death in the United States, while strokes are third, behind all forms of cancer.

Gary F. Thompson, chairman and chief executive officer of MTI, says the test is near and dear to his heart -- literally and figuratively. "I was the first male in my family to reach 50, so I decided to celebrate by running the Los Angeles marathon, but I had a heart attack halfway through it and couldn't finish," Thompson said. "None of the non-invasive tests that I had prior to the marathon detected my silent heart disease, and I knew there had to be something better out there."

Source: PR Newswire
LIN/C
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Spatial domains of Rahu and Kethu in Tunable spin Hall effect spintronic designs of infra/ultra levelsby Quantum Hall’s effect:
FQH effect is the notion that electric current can be carried in chunks with just a fraction of the charge of an electron, a concept that was fully verified by later experiments. Observations of this and other phenomena in the FQH effect has brought new understanding of the ways in which many electrons can interact in a collective quantum state.
In 1879 Edwin Hall reported the classic effect that bears his name: Running current through a wire perpendicular to a magnetic field causes the electrons to deflect sideways and generate a voltage across the wire's width. This "Hall voltage" increases continuously with increasing magnetic field, but a century later physicists discovered that under extreme conditions the Hall effect changes character, in what is now called the integer quantum Hall effect. With electrons trapped in a thin layer of semiconductor at low temperatures and high magnetic fields, the Hall voltage reaches a series of plateaus at precise values as the field is increased. Within these plateaus the ratio of the electric current to the Hall voltage [the Hall conductance] is an integer multiple of a conductance quantum, which is determined only by fundamental constants of nature.
The pursuit of spintronics ultimately depends on our ability to steer spin currents and detect or flip their polarization The 1922 Stern-Gerlach _SG_ experiment1 first demonstrated that electron currents can be steered by the Zeeman force,F=−___•B_, caused by a spatially inhomogeneous magnetic
field B_r_, where _ is the electron magnetic moment. The effect was recently observed for electrons in a semiconductor nanostructure, where the spatially inhomogeneous magnetic field was generated by a ferromagnetic layer.2 In a similarve in, the SG effect has been demonstrated for a beam of light passing through a medium where the photons morph into polaritons and experience a spatially inhomogeneous effective magnetic field.

S.Nandakumar Tuesday, June 1, 2010

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