Abstract
The parallel imaging technique is widely used in 7T MRI scanners. It employs multichannel RF coil arrays to apply a concurrent excitation and acquisition method. Concurrent excitation faces significant challenges in terms of electromagnetic coupling between the RF coil elements. In order to prevent interference between the RF coil elements' exciters, several decoupling methods have been developed to compensate for coupling and to permit independent work for the exciters. This paper studies the coupling between meander coils arranged in two different geometrical setups and investigates the isolation performance between the coils by applying two different decoupling networks depending on the geometrical setup of the coils. These two decoupling networks in addition to a T-shaped decoupling network have been integrated into a Tx/Rx body coil for 7 T to compensate for mutual coupling between array coil elements. The results have been obtained by using CST Microwave Studio (CST AG, Darmstadt, Germany)
Highlights
Ultrahigh magnetic field MRI scanners (e.g., 7T) are considered valuable and promising diagnostic tools due to the higher obtainable signal-to-noise ratio (SNR) and image quality [1,2,3]
Reactive element-based decoupling network In [32], a decoupling network was proposed for wireless communications to isolate between two strongly coupled antennas
The closed-form equations for the elements of the decoupling network were given in the same paper
Summary
Ultrahigh magnetic field MRI scanners (e.g., 7T) are considered valuable and promising diagnostic tools due to the higher obtainable signal-to-noise ratio (SNR) and image quality [1,2,3]. All these approaches use multichannel parallel RF transmission methods These methods utilize different RF coil array elements such as ceramic resonators [11], loops [12, 13], microstrip lines (MSLs) [14], dipole antennas [15], and monopoles [16]. A parasitic element-based decoupling method has been demonstrated as a successful decoupling technique for microstrip transmission line array elements [23], monopole elements [24], and phased array [25]. Another technique that has played an intrinsic role in transmit array decoupling is an ultralow output impedance RF power amplifier [26]. These decoupling networks have been used to decouple a 32-channel body coil for 7 T
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