Global ETD Search
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Showing 1 to 4 of 4 for “"birdcage coil"”.
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A high-pass detunable quadrature birdcage coil at high-field
… energy. The circuit that does this is called a birdcage coil. This coil is capable of producing a very homogenous B1 field over a large volume; it is this aspect of birdcage coils that make them very favorable for animal/human studies as it is necessary that all nuclei in the volume of the coil …
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Simulation of Electromagnetic Effects in Magnetic Resonance Imaging
… time, is employed to analyze the open RF coils in an MRI system. The FD-TD method, known for its ability to handle large and complex geometries, is applied to shielded birdcage coil analysis. Besides studying the field information inside the human head, the RF coil's resonant frequency …
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Off-resonance and detuned surface coils for B₁ inhomogeneity in 7-Tesla MRI
… we attempt to correct this by adding surface coils. To adjust the mutual coupling, we vary the resonance properties of the added coil. A new agar-based head phantom was built, and two surface coils were built and tuned. The surface coils were placed in various configurations against the …
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Mitigating Inhomogeneity in High-Field MRI Excitations: Arbitrary Waveform Optimization and Multiphoton Parallel Transmission (MP-pTx)
… resonance imaging (MRI) using a standard volume coil results in a spatially varying flip angle across the body, which renders images difficult to clinically interpret. This arises from the complex interactions of electromagnetic fields from current-carrying elements surrounding the imaging …