Analytical approach to noncircular section birdcage coil design: Verification with a Cassinian oval coil
نویسندگان
چکیده
منابع مشابه
B1 field homogeneity and SAR calculations for the birdcage coil.
The finite-difference time-domain (FDTD) method is used to model a birdcage resonator. All the coil components, including the wires, lumped capacitors and the source, are geometrically modelled together. As such, the coupling effects within the birdcage, including the interactions of coil, source and human head, are accurately computed. A study of the transverse magnetic (B1) field homogeneity ...
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INTRODUCTION Birdcage coils [l] are widely used for MRI studies of the human brain. Since anatomical constraints require a short birdcage coil (less than 35 cm), the RF field Bi inhomogeneities along the coil axis can be a limiting factor for image quality. Moreover, at high field (23T) numerical MRI results [2-31 show that the Bi is degraded because of strong interactions (inductive sample los...
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G. D. DeMeester, Z. Zhai, M. A. Morich, C. Leussler, C. Findeklee Philips Medical Systems, Cleveland, Ohio, United States, Philips Research Laboratories, Hamburg, Hamburg, Germany Introduction A TEM T/R head coil and a shielded birdcage T/R head coil operated at 298MHz/7T were both modeled using the Finite Difference Time Domain (FDTD) method. The two coils have approximately the same physical ...
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The main goal of this research was to demonstrate the utility of using a quadrature birdcage coil in lowpass version for magnetic resonance imaging (MRI) in open scanner at very low static field. When used in horizontal bore MRI systems, the birdcage coil is able to produce circular polarized field using quadrature excitation, thus reaching SNR improvement of 2 as maximum value. The birdcage co...
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This work describes the study of coil for Magnetic Resonance Imaging (MRI) application. Concretely, the principal objective is the design of a birdcage coil (RF coil) to use in a 7 Tesla scanner. More strength field has a better SNR and increased chemical shift effects, improving spectral fat suppression and spectroscopy. Moreover, a better SNR increases the spatial resolution or reduces the im...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2004
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.20317