Low-frequency quadrature mode birdcage resonator |
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Authors: | Henny M Borsboom Tatjana Claasen-Vuj?i? Harry J G Gaykema Toon Mehlkopf |
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Affiliation: | (1) Spin Imaging Group, Faculty of Applied Physics, Delft University of Technology, Postbus 5046, 2600 GA Delft, The Netherlands, The Netherlands |
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Abstract: | The birdcage resonator is frequently used in conventional MRI because of its excellent attributes. Its use in low-field MRI
is restricted to field strengths higher than, for example, 0.1 T, dependent on the size of the coil. This is because of the
intrinsically low inductance value of the birdcage coils. Furthermore, the sensitivity of the birdcage at low field strengths
is significantly lower when compared to, for example, the solenoid. Both problems can be overcome with the multiturn technique
and a novel wound birdcage coil. The quadrature mode wound birdcage coil presented in this paper can be used at frequencies
as low as 100 kHz. Its sensitivity is also increased when compared to the conventional strip-ring birdcage. Homogeneity effective
volume, and methods to increase the resonator bandwidth to match the signal bandwidth are left intact. The latter is a typical
low-field problem. |
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Keywords: | low-field magnetic resonance imaging radiofrequency coil birdcage coil low frequency |
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