Abstract
Magnetic resonance imaging (MRI) is a widely used non-invasive medical imaging modality that provides 3D structural and functional imaging capability without ionizing radiation. Compared to conventional magnetic resonance imaging (MRI) systems, ultra-high-field (UHF) MRI systems (with main static B 0 field strength at 7 T and above) promise an enhanced signal-to-noise ratio (SNR), thus it plays a pivotal role in high-resolution brain functional imaging. However, the higher RF working frequencies at UHF MRI result in more complex electromagnetic wave behavior when travelling through lossy samples, leading to inhomogeneous RF transmit field (B1 + = (H x +iH y )/2) distributions which diminishes the large potential inherently offered by UHF. The key to solve these problems are the design of RF transmit coils. Here we report a novel RF coil design, the loopole antenna, which can capture both magnetic and electric dipole fields, and therefore greatly improve the homogeneity of the RF transmit field in UHF MRI.
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