Comparing Saddle, Slotted-tube and Parallel-plate Coils for Magnetic Resonance Imaging

D. Nespor 1 , K. Bartusek 2 ,  and Z. Dokoupil 2
  • 1 Department of Theoretical and Experimental Electrical Engineering, Brno University of Technology, Kolejni 2906/4, 612 00 Brno, Czech Republic
  • 2 Institute of Scientific Instruments, Academy of Sciences of the Czech Republic, Kralovopolska 147, 612 64 Brno, Czech Republic


The paper is concerned with a comparison of the properties of RF coils of three configurations for MRI measurements on small animals. In comparison with the classical saddle coil the proposed modification of slotted-tube coil exhibits identical homogeneity of B1 field in a larger space. The parallel-plate coil has a satisfactory homogeneity of B1 field over the whole internal space. The signal-to-noise ratio measured for all three coils is roughly the same and is given by the magnitude of RF pre-amplifier noise. As the slotted-tube and parallel-plate coils have a lower inductance compared with the saddle coil, they can be tuned to resonance on the 200 MHz frequency even at larger dimensions. The results show that the parallel-plate coil has very good properties for the measurement of small animals.

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  • [1] Bogdanov, G., Ludwig, R. (2002). A coupled microstrip line transverse electromagnetic resonator model for high-field magnetic resonance imaging. Magnetic Resonance in Medicine, 47, 579-593.

  • [2] Akgun, C.E., DelaBarre, L., Sohn, S.M., Snyder, C., Adriany, G., Ugurbil, K., Vaughan, J.T., Gopinath, A. (2009). Novel multi-channel transmission line coil for high field magnetic resonance imaging. In IEEE MTTS International Microwave Symposium Digest, 7-12 June 2009. IEEE, 1425-1428.

  • [3] Benabdallah, N., Benahmed, N., Benyoucef, B., Bouhmidi, R., Khelif, M. (2007). Electromagnetic analysis of the slotted-tube resonator with a circular cross section for MRI applications. Physics in Medicine and Biology, 52, 4943-4952.

  • [4] Alderman, D.W., Grant, D.M. (1979). An efficient decoupler coil design which reduces heating in conductive samples in superconducting spectrometers. Journal of Magnetic Resonance, 34, 425-433.

  • [5] Li, S., Yang, Q.X., Smith, M.B. (1994). RF coil optimization: Evaluation of B1field homogeneity using field histograms and finite element calculations. Magnetic Resonance Imaging, 12, 1079-1087.

  • [6] Chen, Q., Sawaya, K., Uno, T., Adachi, S., Ochi, H., Yamamoto, E.A. (1994). Three dimensional analysis of slotted tube resonator for MRI. IEEE Transaction on Medical Imaging, 13 (4).

  • [7] Ben Ahmed, N., Feham, M. (2006). Analyzing EM parameters for shielded bandline. Microwaves & RF, 45, 86-92.

  • [8] Ben Ahmed N., Feham, M., Khelif, M., (2006). Analysis and design of a coupled coaxial line TEM resonator for magnetic resonance imaging. Physics in Medicine and Biology, 51, 2093-2099.

  • [9] Hayes, C.E., Edelstein, W.A., Schenck, J.F., Muller, O.M., Eash, M.J. (1985). An efficient, highly homogeneous radiofrequency coil for whole-body NMR imaging at 1.5T. Journal of Magnetic Resonance, 64, 622-628.

  • [10] Baertlein, B.A., Ozbay, O., Ibrahim, T., Lee, R., Yu, Y., Kangarlu, A., Robitaille, P.M.L. (2000). The theoretical model for an MRI radiofrequency resonator. IEEE Transactions on Biomedical Engineering, 47, 535-546.

  • [11] Vaughan, T., DelaBarre, L., Snyder, C., Tian, J., Akgun, C., Shrivastava, D., Liu, W., Olson, C., Adriany, G., Strupp, J., Andersen, P., Gopinath, A., Van de Moortele, P-F., Garwood, M., Ugurbil, K. (2006). 9.4T human MRI: Preliminary results. Magnetic Resonance in Medicine, 56 (6), 1274-1282.

  • [12] Vaughan, J., DelaBarre, L., Snyder, C., Adriany, G., Collins, C., Van de Moortele, P-F., Ritter, J., Strupp, J., Andersen, P., Tian, J., Smith, M., Ugurbil, K. (2005). RF image optimization at 7T and 9.4T. In International Society for Magnetic Resonance in Medicine, 13, 953.

  • [13] Ibrahim, T., Lee, R., Robitaille, P. (2001). Effect of RF coil excitation on field inhomogeneity at ultra-high fields: A field optimized TEM resonator. Magnetic Resonance Imaging, 19, 1339-1347.

  • [14] Smirg, O., Liberda, O., Smekal, Z., Sprlakova-Pukova, A. (2012). A MRI slice segmentation and 3D modelling of temporomandibular joint measured by microscopic coil. Measurement Science Review, 12 (3), 74-81.

  • [15] Přibil, J., Gogola, D., Dermek, T., Frollo, I. (2012). Design, realization and experiments with a new RF head probe coil for human vocal tract imaging in an NMR device. Measurement Science Review, 12 (3), 98-103.

  • [16] Meadowcroft, M.D., Zhang, S., Liu, W., Park, B.S., Connor, J.R., Collins, C.M., Smith, M.B., Yang, Q.X. (2007). Direct magnetic resonance imaging of histological tissue samples at 3.0T. Magnetic Resonance in Medicine, 57 (5), 835-841.

  • [17] Marzola, P., Osculati, F., Sbarbati, A. (2003), High field MRI in preclinical research. European Journal of Radiology, 48 (2), 165-170.

  • [18] Vazquez, F., Martin, R., Marrufo, O., Rodriguez, A.O. (2010). Waveguide magnetic resonance imaging at 3 Tesla. In Joint Annual Meeting ISMRM-ESMRMB.

  • [19] Brunner, D.O., De Zanche, N., Froehlich, J., Paska, J., Pruessmann, K.P. (2009). Travelling-wave nuclear magnetic resonance. Nature, 457 (7232), 994-U2.

  • [20] Zhang, J., Balcom, B.J. (2010). Parallel-plate RF resonator imaging of chemical shift resolved capillary flow. Magnetic Resonance Imaging, 28, 826-833.

  • [21] Bobroff, S., McCarthy, M.J. (1999). Variations on the slotted-tube resonator: Rectangular and elliptical coils. Magnetic Resonance Imaging, 17 (5), 783-789.

  • [22] Sheen, J. (2008). A dielectric resonator method of measuring dielectric properties of low loss materials in the microwave region. Measurement Science and Technology, 19 (5), 055701.

  • [23] Akay, M.F., Prokopenko, Y., Kharkovsky, S. (2004) Resonance characteristics of whispering gallery modes in parallel-plates-type cylindrical dielectric resonators. Microwave and Optical Technology Letters, 40 (2), 96-101.

  • [24] Nespor, D., Bartusek, K., Fiala, P. (2011). Using numerical analysis for NMR coils optimization. PIERS Proceedings, 12-16 September 2011. The EM Academy, 72-75.


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