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PIERS Online
Vol. 2
No. 6
2006
pp: 555-558Measurement of Radio Frequency Magnetic FieldKarel Bartušek and Eva Gescheidtová doi:10.2529/PIERS060712051639 Downloads: 1112 Abstract:A high quality of magnetic fields is one of the basic prerequisites for a perfect operation of the MR tomographic scanner. Magnetic susceptibility of materials that are used for body implants causes much distortion in MR images. The paper deals with mapping the radio frequency magnetic field induction in the vicinity of these materials with the aim of characterizing the magnetic field and comparing the results with fields simulated in the ANSYS program. Magnetic resonance method of radio frequency magnetic field mapping was verified and optimized for both the characterizing of MR imaging detecting coil and the effects of electrical conducting samples. The designed method is based on optimized spin-echo imaging sequence with small flip angle.References:1. Hoult, D. I., Concepts Magn. Reson., No. 12, 173-187, 2000. 2. Kreis, R. and et al., J. Magn. Reson., No. 149, 245-250, 2001. 3. Helms, G., NMR Biomed, No. 13, 398-406, 2000. 4. Liang, Z. P. and P. C. Lauterbur, Principles of Magnetic Resonance Imaging, IEEE Press, New York, 2000. 5. Dahlqvist, O., L. Cohen, E. Lund, and P. Lundberg, "Absolute quantification of 31P muscle MRS using B1-field mapping," Proc. Intl. Soc. Mag. Reson. Med., No. 13, 2768, 2005. |
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