Comparison of 12 Quadrature Birdcage Coils with Different Leg Shapes at 9.4 T

Xu, Yongfeng; Wen, Qingqing

doi:10.1007/s00723-017-0920-y

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…They also revealed that the RF coil that is made of foil conductors etched on a flexible dielectric substrate (or FPCB) exhibits excellent characteristics on high field MRI applications. For ultra-high field (>9.4T) birdcage coils, Xu et al conducted an extensive study regarding the conductors with various shapes being used for the coil construction [58]. They used 12 conductors with different cross-sectional shapes and confirmed that the width of the leg conductors is an important factor in the performance of the birdcage coil.…”

Section: Conductor Geometrymentioning

confidence: 99%

Recent Progress in Birdcage RF Coil Technology for MRI System

et al. 2020

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The radio frequency (RF) coil is one of the key components of the magnetic resonance imaging (MRI) system. It has a significant impact on the performance of the nuclear magnetic resonance (NMR) detection. Among numerous practical designs of RF coils for NMR imaging, the birdcage RF coil is the most popular choice from low field to ultra-high field MRI systems. In the transmission mode, it can establish a strong and homogeneous transverse magnetic field B1 for any element at its Larmor frequency. Similarly, in the reception mode, it exhibits extremely high sensitivity for the detection of even faint NMR signals from the volume of interest. Despite the sophisticated 3D structure of the birdcage coil, the developments in the design, analysis, and implementation technologies during the past decade have rendered the development of the birdcage coils quite reasonable. This article provides a detailed review of the recent progress in the birdcage RF coil technology for the MRI system.

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Section: Conductor Geometrymentioning

confidence: 99%

Recent Progress in Birdcage RF Coil Technology for MRI System

et al. 2020

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A theoretical and experimental investigation on a volume coil with slotted end-rings for rat MRI at 7 T

Solis-Najera

Ruiz

Martin

et al. 2023

Magn Reson Mater Phy

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Objective A volume coil with squared slots-end ring was developed to attain improved sensitivity for imaging of rat’s brain at 7 T. Material and Methods The principles of the high cavity resonator for the low-pass case and the law of Biot-Savart were used to derive a theoretical expression of $$B_1/i$$ B 1 / i . The slotted-end ring resonator showed a theoretical 2.22-fold sensitivity improvement over the standard birdcage coil with similar dimensions. Numerical studies were carried out for the electromagnetic fields and specific absorption rates for our coil and a birdcage coil loaded with a saline-filled spherical phantom and a digital brain of a rat. Results An improvement of the signal-to-noise ratio (SNR) can be observed for the slotted volume coil over the birdcage regardless of the load used in the electromagnetic simulations. The specific absorption rate simulations show a decrement for the digital brain and quite similar values with the saline solution phantom. Phantom and rat’s brain images were acquired at 7 T to prove the viability of the coil design. The experimental noise figure of our coil design was four times less than the standard birdcage with similar dimensions, which showed a 44.5% increase in experimental SNR. Discussion There is remarkable agreement among the theoretical, numerical and experimental sensitivity values, which all demonstrate that the coil performance for MR imaging of small rodents can be improved using slotted end-rings.

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Comparison of 12 Quadrature Birdcage Coils with Different Leg Shapes at 9.4 T

Cited by 2 publications

References 13 publications

Recent Progress in Birdcage RF Coil Technology for MRI System

Recent Progress in Birdcage RF Coil Technology for MRI System

A theoretical and experimental investigation on a volume coil with slotted end-rings for rat MRI at 7 T

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