Navigation Links
NIST mini-sensor traces faint magnetic signature of human heartbeat
Date:10/14/2010

Researchers from the National Institute of Standards and Technology (NIST) and the German national metrology institute have used NIST's miniature atom-based magnetic sensor to successfully track a human heartbeat, confirming the device's potential for biomedical applications.

Described in Applied Physics Letters,* the study is the first to be performed under conditions resembling a clinical setting with the NIST mini-sensors, which until now have been operated mostly in physics laboratories. The new experiments were carried out at the Physikalisch Technische Bundesanstalt (PTB) in Berlin, Germany, in a building described as having the world's best magnetic shieldingnecessary to block the Earth's magnetic field and other external sources from interfering with the high-precision measurements. PTB has an ongoing program in biomagnetic imaging using human subjects.

The NIST sensora tiny container of about 100 billion rubidium atoms in gas form, a low-power infrared laser, and opticsmeasured the heart's magnetic signature in picoteslas (trillionths of a tesla). The tesla is the unit that defines magnetic field strength. For comparison, the Earth's magnetic field is a million times stronger (measured in millionths of a tesla) than a heartbeat, and an MRI machine uses fields several million times stronger still (operating at several tesla).

In the experiments at PTB, the NIST sensor was placed 5 millimeters above the left chest of a person lying face up on a bed. The sensor successfully detected the weak but regular magnetic pattern of the heartbeat. The same signals were recorded using the "gold standard" for magnetic measurements, a SQUID (superconducting quantum interference device). A comparison of the signals confirmed that the NIST mini-sensor correctly measured the heartbeat and identified many typical signal features. The NIST mini-sensor generates more "noise" (interference) in the signal but has the advantage of operating at room temperature, whereas SQUIDs work best at minus 269 degrees Celsius and require more complicated and expensive supporting apparatus.

A spin-off of NIST's miniature atomic clocks, NIST's magnetic mini-sensors were first developed in 2004. Recently, they were packaged with fiber optics for detecting the light signals that register magnetic field strength. (See the 2007 NIST news release "New NIST Mini-Sensor May Have Biomedical and Security Applications" at http://www.nist.gov/public_affairs/releases/magnetometer.cfm.) In addition, the control system has been reduced in size, so the entire apparatus can be transported easily to other laboratories.

The new results suggest that NIST mini-sensors could be used to make magnetocardiograms, a supplement or alternative to electrocardiograms. The study also demonstrated for the first time that atomic magnetometers can offer sensing stability lasting tens of seconds, as needed for an emerging technique called magnetorelaxometry (MRX), which measures the magnetization decay of magnetic nanoparticles. MRX is used to localize, quantify and image magnetic nanoparticles inserted into biological tissue for medical applications such as targeted drug treatments. Further tests of the NIST sensors at PTB are planned.


'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology news :

1. Traces of early Native Americans -- in sunflower genes
2. Natural-born divers and the molecular traces of evolution
3. Magnetic attraction for fish, crabs?
4. Half-a-loaf method can improve magnetic memories
5. Rutgers researchers assess severity of prostate cancers using magnetic resonance imaging
6. A magnetic solution to identify and kill tumors
7. Louisiana Tech professor, researcher receives patent for electromagnetic technology
8. Researchers develop drug delivery system using nanoparticles triggered by electromagnetic field
9. Nuclear magnetic resonance aids in drug design
10. Texas Childrens Cancer Center first in Texas to magnetically lengthen nine-year-olds leg as she grows
11. Magnetic nanoparticles show promise for combating human cancer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NIST mini-sensor traces faint magnetic signature of human heartbeat
(Date:12/15/2016)... Calif. , Dec. 15, 2016   WaferGen ... publicly held genomics technology company, announced today that on ... Listing Qualifications Department of The Nasdaq Stock Market LLC ... closing bid price of WaferGen,s common stock had been ... Accordingly, WaferGen has regained compliance with Listing Rule 5550(a)(2) ...
(Date:12/15/2016)... 14, 2016 "Increase in mobile transactions is ... mobile biometrics market is expected to grow from USD ... 2022, at a CAGR of 29.3% between 2016 and ... the growing demand for smart devices, government initiatives, and ... "Software component is expected to grow at a high ...
(Date:12/7/2016)... 2016 According to a new market research report "Emotion ... Expression, Voice Recognition), Service, Application Area, End User, And Region - Global Forecast ... USD 6.72 Billion in 2016 to USD 36.07 Billion by 2021, at a ... Reading ... MarketsandMarkets Logo ...
Breaking Biology News(10 mins):
(Date:1/18/2017)... ... January 18, 2017 , ... DrugDev ... for Clinical Ops Executives (Hyatt Regency Miami, January 24-26). DrugDev will join customers ... research issues such as trial performance metrics, patient enrollment diversity, protocol optimization, and ...
(Date:1/18/2017)... ... January 18, 2017 , ... ... of the latest paper by its Science Editor, Dr. Elisabeth Bik, in the ... Medische Microbiologie). Dr. Bik joined uBiome in October 2016 from her previous position ...
(Date:1/18/2017)... 2017 Shareholder rights law firm Johnson & ... board members of CoLucid Pharmaceuticals, Inc. (NASDAQ: ... the proposed sale of the Company to Eli Lilly ... small molecules for the acute treatment of migraines. ... signed a definitive merger agreement with Eli Lilly. Under ...
(Date:1/18/2017)... 2017  Caris Life Sciences, a leading innovator ... largest private funder of pancreatic cancer research, are ... impact of immunotherapy in the treatment of pancreatic ... to identify potential trial candidates based on biomarker ... and study investigators. The Lustgarten Foundation is a ...
Breaking Biology Technology: