Reactive-element based decoupling network for a two-element MRI phased array

Salama, Sanaa

doi:10.1016/j.jksues.2018.05.003

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…In [25], a solid isolation among elements has been achieved by inserting a robust decoupling network between power amplifiers and transmit array elements. Capacitive and inductive decoupling methods have been developed to decouple the adjacent coil elements [26][27][28]. A parasitic decoupling elements method [29], in which the working principle is based on induced current elimination (ICE), has been presented as a successful decoupling technique for microstipline and monopole coil array elements [30,31].…”

Section: Introductionmentioning

confidence: 99%

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Abuelhaija¹,

Salama²,

Baldawi³

2020

PIER C

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Symmetrically excited meandered microstrip line RF coil elements are widely used in multichannel approaches; i.e., being integrated in ultra-high field magnetic resonance imaging (MRI) systems (i.e., 7-Tesla and higher). These elements have demonstrated strong magnetic field in deep areas through the object under imaging. Designing a radio frequency (RF) coil array that employs these elements without decoupling networks might cause non-optimized driving performance of coil array which in turn result in non-clear image. In this paper, two different methods of decoupling are studied: port decoupling and array elements decoupling. In the first one, the coil elements are designed at Larmor frequency (297.3 MHz), while in the other one, the coil elements are designed at higher frequencies but matched at Larmor frequency. Port decoupling does not always mean element decoupling. Conventional decoupling methods, such as single capacitor or inductor, face challenges to realize the coil element decoupling for meandered microstrip arrays. An optimized reactive (T-shaped) network is needed in order to achieve element decoupling which in turn prevents distortion of the EM field. All simulation results have been obtained using the CST time domain solver (CST AG, Darmstadt, Germany).

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Section: Introductionmentioning

confidence: 99%

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Abuelhaija¹,

Salama²,

Baldawi³

2020

PIER C

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“…Because of the small separation of the elements (≈ 0.1 of λ), the MRI phased arrays are strongly affected by the mutual coupling. In MRI phased arrays, by decreasing the space between array active elements, the mutual coupling is increasing [9]. Many researchers have been benefited from the designed DNs for wireless communication systems and the same concepts are now applied for MRI phased arrays.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have been benefited from the designed DNs for wireless communication systems and the same concepts are now applied for MRI phased arrays. In [9], a DN was built based on the idea of reactive load. The reactive loads were modeled as inductive loads connected in parallel with the two RF coil elements in the array.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Salama

Abuelhaija

Baldawi

et al. 2020

mjee

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This work presents and evaluates the integrating of decoupling networks in MRI systems at 7 Tesla magnetic field strength. The parasitic element is reactive loaded. Four different cases of reactive loads are considered: capacitive load, inductive load, open circuited, and short-circuited loads are considered. The idea behind this technique is to reduce or even eliminate the effect of mutual coupling between the RF coil elements in magnetic resonance imaging (MRI)system. Two rectangular loops are used to compose a planar phased array. This structure is designed and optimized in CST at the Larmor frequency of 298.3 MHz corresponding to the 7 Tesla MRI system.

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“…Simulation results in [19] showed that a decoupling matrix can be inserted between the power amplifiers and the transmit array to achieve ideal decoupling. Reactive decoupling networks have been developed to be inserted between the adjacent coil * Correspondence: ashrafabuelhaija@googlemail.com elements in order to compensate for mutual coupling [20][21][22]. 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].…”

Section: Introductionmentioning

confidence: 99%

Decoupling network for Tx/Rx body coil for 7T MRI

Abuelhaija¹,

Salamh²,

Nashwan³

2019

Turk J Elec Eng & Comp Sci

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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).

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Reactive-element based decoupling network for a two-element MRI phased array

Cited by 4 publications

References 9 publications

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Comprehensive Study on Decoupling Networks for 7 Tesla MRI based on Reactive Load Parasitic-Element

Decoupling network for Tx/Rx body coil for 7T MRI

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