Navigation Links
Magnetic field measurements of the human heart at room temperature
Date:12/11/2009

This release is available in German.

The "magnetically best shielded room on earth" has the size of an apartment block and is located on the site of the Physikalisch-Technische Bundesanstalt (PTB), Institute Berlin. Magnetic fields such as that of the earth are kept out here as effective as nowhere else. Such ideal conditions allow to measure the tiny magnetic fields of, e.g., the human heart. This was the motivation for the American National Institute of Standards and Technology (NIST) to ask PTB to jointly test a newly developed optical magnetic field sensor. It is based on a physical principle very different from SQUIDs, which are usually applied for biomagnetic field measurements. The optical sensor does not need advanced cooling and has the size of a lump of sugar. A high-quality measurement of the human heart signal was demonstrated using this optical sensor. The sensor's suitability was thus proven for biomagnetic measurements in the picotesla range. In future magnetocardiographic measurement devices to be used as a supplement or an alternative to the ECG could become simpler and less expensive.

Up until now one had to cool as much as one could for biomagnetic measurements! This was necessary as SQUIDs, superconducting quantum interference devices, work optimally at -269 degrees Celsius and can only then fulfil their purpose of measuring tiny magnetic fields. SQUIDs are the best suited sensors to record the magnetic fields arising during the electrical activity of the human heart. A magnetocardiogram (MCG) can be compiled supplementing a conventional electrocardiogram (ECG). (The same applies to the magnetoencephalogram, MEG, which is a recording of the magnetic field of the brain.) Yet to use SQUIDs requires well-shielded rooms and complicated cooling systems. The latter might become obsolete in the future if the optical magnetometer developed by NIST continues to fulfil expectations.

The optical sensor is a byproduct of the development of miniaturized atomic clocks, one of NIST's current key research areas. As biomagnetic research is not established at NIST, the scientists turned to their colleagues at PTB in Berlin. PTB is one of the few metrological state institutes in the world with a large scale biomedical research program. The combination of highly advanced equipment such as the magnetically shielded room (BMSR-2) with the experience in testing new sensors on human subjects made PTB the ideal partner for NIST.

Using the optical magnetometer PTB experts measured the magnetic field of the human heart and relaxation curves of magnetic nanoparticles. Both are important routine laboratory measurements normally applying SQUIDs. For a direct comparison of the results, SQUID reference data were recorded simultaneously with the optical magnetometer using the multichannel SQUID device installed in the BMSR-2.

The impressive quality of the data obtained confirms the suitability of these optical micromagnetometers in the picotesla range. This is the range for magnetic field measurements of the heart, but further improvements are needed to measure the even tinier fields of the human brain. Compared to SQUIDs, the optical sensors exhibited as expected a significantly higher noise level. The distinct advantage of these sensors lies, however, in their small design (< 1 cm3). This allows them to be installed at a small distance from the magnetic source in order to increase the signal strength. The room temperature operation of the sensor and its small size will allow a much simpler system design compared to other sensor types suitable for this measurement range. The fabrication of the sensor by use of microsystem technology could enable simple and cost-effective mass production. NIST plans the development of a multichannel system on the basis of the existing technology. Further tests of these sensors at PTB are planned.


'/>"/>

Contact: Dr. Tilman Sander-Thoemmes
tilmann.sander-thoemmes@ptb.de
49-303-481-7436
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert  

Related medicine news :

1. Stereotaxis Showcases Interventional Value of Magnetic Navigation at TCT 2009
2. New Data Demonstrate Magnetic Resonance Safety of AQUACEL(R) Ag Dressing
3. IRadimed Announces 510K Clearance of the New Non-Magnetic MRidium(TM) MRI IV Pump with Integrated Masimo SET(R) SpO2 Monitoring
4. UT Southwestern, UT Arlington to develop magnetic surgery tools
5. New therapy based on magnetic stimulation shows promise for non-drug treatment for migraine
6. VirtualScopics Scientists to Present at International Society for Magnetic Resonance in Medicine 17th Scientific Meeting and Exhibition
7. Walter Reed First Military Hospital to Use Transcranial Magnetic Stimulation to Treat Depression
8. Magnetic-anchor-guided endoscopic submucosal dissection shows promise for gastric cancer
9. Stereotaxis Annouces First CTO Crossing Procedure With RF PowerAssert(TM) Magnetic Guidewire
10. Brains Magnetic Fields Reveal Language Delays in Autism
11. A biomagnetic diagnostic technique to evaluate esophageal transit time
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Magnetic field measurements of the human heart at room temperature
(Date:2/11/2016)... ... February 12, 2016 , ... The Journal of Pain ... 0.416 in 2013. The SJR uses data taken from the Scopus database (Elsevier B.V.) ... number of citations received by the journal over a three year period and also ...
(Date:2/11/2016)... ... ... Hall Integrative Health and Chiropractic, PC which focuses on ... in March. All seven practices are set to start accepting patients in March ... According to this 2011 CNN article it is possible: http://www.cnn.com/2011/HEALTH/01/28/reverse.diabetes/ . Current ...
(Date:2/11/2016)... DC (PRWEB) , ... February 11, 2016 , ... ... an upcoming Feb. 23 webinar, “Intel’s Direct-to-Employee Benefit Model: A Case Study for ... not-for-profit Catholic health care system that’s partnering with Intel on value-based health benefits ...
(Date:2/11/2016)... ... February 11, 2016 , ... ... as General Counsel. Garrett will focus on contract negotiations, corporate strategy and healthcare ... security law, and best practices in data breaches for the Part D Star ...
(Date:2/11/2016)... , ... February 11, 2016 , ... ... updated its hallmark resource, Infusion Therapy Standards of Practice, to include vascular visualization ... illumination with an estimated 85% share of the market, facilitates adherence to this ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... -- Walgreens has committed to provide drug disposal kiosks ... D.C. as part of a program to combat ... advocacy organization As You Sow. Conrad MacKerron , ... on to unneeded drugs because they lack easily accessible collection ... --> Conrad MacKerron , Senior Vice President at As ...
(Date:2/11/2016)... 11, 2016   Health 2.0 , the premiere ... technologies, announced today " 10 Year Global Retrospective ", ... over the past ten years.   ... Health 2.0 has served as the preeminent thought-leader in ... thousands of technologies, companies, innovators, and patient-activists through an ...
(Date:2/11/2016)... , Feb. 11, 2016  NOIT™ Research LLC, a ... "Gift of Change" campaign to assist needy families in ... such unit sold between February 10, 2016 and March ... a needy family. The NOIT is an auditory stimulus ... individuals develop language skills. Beth Shier ...
Breaking Medicine Technology: