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PAPERS

17/04/2013

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balzano@itis-usa.org

 

CEM43°C Thermal Dose Thresholds: A Potential Guide for Magnetic Resonance Radiofrequency Exposure Levels?

Gerard C. van Rhoon, Theodoros Samaras, Pavel S. Yarmolenko, Mark W. Dewhirst, Esra Neufeld, and Niels Kuster,European Radiology, Volume 23, Issue 8, pp. 2215-2227, August 2013, online April, 2013

 
PAPERS

26/03/2013

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balzano@itis-usa.org

 

Analysis of Mobile Phone Design Features Affecting Radio-frequency Power Absorbed in a Human Head Phantom

Sven Kühn, Michael Kelsh, Niels Kuster, Asher Sheppard, and Mona Shum, Bioelectromagnetics, Volume 34, Issue 6,pp. 479–488, September 2013, online March 26, 2013

 
PAPERS

15/03/2013

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balzano@itis-usa.org

 

Stimulation of the Brain with Radiofrequency Electromagnetic Field Pulses Affects Sleep-Dependent Performance Improvement

Caroline Lustenberger, Manuel Murbach, Roland Dürr, Marc R. Schmid, Niels Kuster, Peter Achermann, and Reto Huber, Brain Stimulation, Volume 6, Issue 5, pp. 805-811, September 2013, online February 26, 2013

 
Whole-Body and Local RF Absorption in Human Models as a Function of Anatomy and Position within 1.5T MR Body Coil
11/03/2013

Whole-Body and Local RF Absorption in Human Models as a Function of Anatomy and Position within 1.5T MR Body Coil

Manuel Murbach, Esra Neufeld, Wolfgang Kainz, Klaas P. Pruessmann, and Niels Kuster, Magnetic Resonance in Medicine, Volume 71, Issue 2, pp. 839-845, February 2014, online February 25, 2013

We investigated the correlation between large-scale anatomical features (e.g., height, weight) and radiofrequency (RF) energy deposition during magnetic resonance imaging (MRI). Six anatomical human models (three adults and three children) were evaluated in different MR imaging positions (head to knees) within a 1.5 T body coil. The specific absorption rate (SAR), the pivotal parameter used to quantify absorbed RF, increases with the radial dimension of the patient and, therefore, with the large-scale anatomical properties. For a fixed B1+ incident field, the whole body SAR (wbSAR) can be up to 2.5 times higher (local SAR up to 7 times) in obese adult models compared to child models. When the exposure is normalized to 4 W/kg wbSAR, the local SAR can well exceed safety limits for local transmit coils and shows inter-subject variations of up to a factor of three. The correlations between anatomy and induced local SAR are weak for normalized exposure, but strong for a fixed B1+ field, suggesting that anatomical properties could be valuable for rapid SAR predictions. This study demonstrates that a representative virtual human population is indispensable for the investigation of local SAR levels.  

The scientific and technical impact of this study can be summarized as:

  • Accurate computational human models are excellent tools for studying the influence of anatomy on MR exposure.
  • Rapid SAR prediction based on large-scale anatomical properties of the patient is feasible.
  • RF absorption is quantized as a function of anatomy.
  • Worst-case MR exposure scenarios and numerical evidence of very high local SAR hotspots that depend on model and position can be identified.
PAPERS

25/02/2013

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balzano@itis-usa.org

 

No Increased Sensitivity in Brain Activity of Adolescents Exposed to Mobile Phone-Like Emissions

Sarah P. Loughran, Dominik Benz, Marc Schmid, Manuel Murbach, Niels Kuster, and Peter Achermann, Clinical Neurophysiology, Volume 124, Issue 7, pp. 1303-1308, July 2013, online February 20, 2013

 
PAPERS

19/02/2013

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Thermal Tissue Damage Model Analyzed for Different Whole-Body SAR and Scan Durations for Standard MR Body Coils

Manuel Murbach, Esra Neufeld, Myles Capstick, Wolfgang Kainz, David O. Brunner, Theodoros Samaras, Klaas P. Pruessmann, and Niels Kuster, Magnetic Resonance in Medicine, Volume 71, Issue 1, pp. 421-431, January 2014, online February 14, 2013

 
PAPERS

18/02/2013

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Analysis of Human Brain Exposure to Low-Frequency Magnetic Fields: A Numerical Assessment of Spatially Averaged Electric Fields and Exposure Limits

Xi Lin Chen, Stefan Benkler, Nicholas Chavannes, Valerio De Santis, Jurriaan Bakker, Gerard van Rhoon, Juan Mosig, and Niels Kuster, Bioelectromagnetics, Volume 34, Issue 5, pp. 375-384, July 2013, February 12, 2013

 
PAPERS

31/01/2013

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balzano@itis-usa.org

 

Influence of GSM Signals on Human Peripheral Lymphocytes: Study of Genotoxicity

Petra Waldmann, Susanne Bohnenberger, Rüdiger Greinert, Beate Hermann-Then, Anja Heselich, Stefanie J. Klug, Jochem Koenig, Kathrin Kuhr, Niels Kuster, Mandy Merker, Manuel Murbach, Dieter Pollet, Walter Schadenboeck, Ulrike Scheidemann-Wesp, Britt Schwab, Beate Volkmer, Veronika Weyer, and Maria Blettner, Radiation Research, Volume 179, Issue 4, pp. 243-253, April 2013, online January 14, 2013

 
PAPERS

28/01/2013

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Cell Type-Dependent Induction of DNA Damage by 1800 MHz Radiofrequency Electromagnetic Fields Does Not Result in Significant Cellular Dysfunctions

Shanshan Xu, Guangdi Chen, Chunjing Chen, Chuan Sun, Danying Zhang, Manuel Murbach, Niels Kuster, Qunli Zeng, and Zhengping Xu, PLoS ONE, Volume 8, Issue 1, online ahead of print January 23, 2013

 
 
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