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

Abstract

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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