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Int Symp Appl Sci Biomed Commun Technol. 2011;2011. pii: 70. doi: 10.1145/2093698.2093768.

Evaluation of Common RF Coil Setups for MR Imaging at Ultrahigh Magnetic Field: A Numerical Study.

Author information

1
Department of Electrical Engineering and Computer Science, University of California Berkeley, Berkeley, CA, USA.
2
Department of Radiology and Biomedical Imaging, University of California San Francisco (UCSF).
3
UCB/UCSF Joint Graduate Group in Bioengineering, University of California- San Francisco, San Francisco, CA, USA.

Abstract

This study is an evaluation of the ratio of electric field to magnetic field (E/B1), specific absorption rate (SAR) and signal-to-noise ratio (SNR) generated by three different RF transceiver coil setups: surface coil, surface coil with shielding, and microstrip using a finite discrete time domain (FDTD) simulation in the presence of a head phantom. One of our main focuses in this study is to better understand coil designs that would improve patient safety at high fields by studying a coil type that may potentially minimize SAR while examining potential changes in SNR. In the presence of a human head load, the microstrip's E/B1 ratio was on average smallest while its SAR was also on average smallest of the three setups, suggesting the microstrip may be a better RF coil choice for MRI concerning patient safety and parallel excitation applications than the other two coils. In addition, the study suggests that the microstrip also has a higher SNR compared with the other two coils demonstrating the possibility that the microstrip could lead to higher quality MRI images.

KEYWORDS:

High field; RF coil; electromagnetic calculation; microstrip; numerical modeling; signal-to-noise ratio (SNR); specific absorption rate (SAR)

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