Abstract
This study analyzed asymmetrical designs of birdcage (BC) coils, for which the conventional shape of the BC is modified in order to improve field intensity and uniformity in the brain region for magnetic resonance imaging (MRI) at 4.7T. Typically the BC coil has insufficient field uniformity when operating at higher frequencies such as 200 MHz, corresponding to the Larmor frequency at 4.7T, due to the interaction between the electrical properties of body tissue and the propagated magnetic field wavelength. We propose a new design of BC coil, which consists of different ring diameters and leg width. The performance of proposed designs was compared to that of a head-size BC coil. Using finite-difference time-domain simulations to obtain the |B1+| fields for a human model, we demonstrate that the proposed designs can achieve better field intensity and uniformity compared with other BC coil designs.
Highlights
Coil for Head Imaging at 4.7T MRI.Advances in medicine and technology have made it possible to produce brain images using magnetic resonance imaging (MRI)
A great deal of research has been invested in increasing the magnetic field strength of MRI systems with the objective of producing images with a higher signal-to-noise ratio (SNR) because increasing the magnetic field strength polarizes a larger number of protons, thereby producing stronger signals
Increasing the frequencies used in MRI systems, which results from the development of stronger magnets, requires the design of a radiofrequency (RF) coil that is capable of producing a field with high intensity and uniformity [1]
Summary
Coil for Head Imaging at 4.7T MRI. Advances in medicine and technology have made it possible to produce brain images using magnetic resonance imaging (MRI). In the study by [22], the proposed BC coil utilizes an approximately elliptical shape to higher frequency of the main magnet leading to reduced homogeneity and higher SAR for accommodate the upper body of a human subject, with the study concluding that a highly the produced field [18]. This field studywas proposes a BCFurthermore, design with a in varying geometry to an achieve better field small animals is proposed, for which half of theproposed. Previous studies have demonstrated that large BC coils produce more uniform mag-
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