Metamaterial inspired wireless coil for clinical breast imaging

Puchnin, Viktor; Solomakha, Georgiy; Nikulin, A. V.; Magill, Arthur W.; Andreychenko, Anna; Shchelokova, Alena

doi:10.1016/j.jmr.2020.106877

Cited by 16 publications

(12 citation statements)

References 22 publications

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“…In our study, we tuned the coil inside the detuned BC, which made it impossible to track the coupling between the BC and the HHMM‐coil. Thus, we iteratively adjusted either the MM‐coil or the HH‐coil to find the highest gain in the transmit efficiency and SNR, as was done in a previous study with the linear wireless coil 35 . In systems with a tuned BC, precise tuning can be obtained by minimizing the S‐parameters of the BC in the presence of the HHMM‐coil and a tissue‐equivalent phantom.…”

Section: Discussionmentioning

confidence: 99%

“…One of the limitations of the previously reported wireless coils for the breast based on ceramic or 'metasolenoid' resonators 28,29,35 was their poor visualization of axillary lymph nodes, essential for the comprehensive assessment. To improve the diagnostic capabilities of the quadrature HHMM-coil, we also considered an extended design with an increased internal volume and expanded area for external elements of the H-coils.…”

Section: Electromagnetic Simulationsmentioning

confidence: 99%

“…However, such structures made of high-permittivity ceramics are quite fragile and challenging to manufacture since the coil material should possess high-temperature stability and low electromagnetic losses. At the same time, artificial dielectrics [30][31][32][33] and metamaterial-inspired resonators [34][35][36][37] have overcome the limitations of natural materials and have proven to be a good alternative to the high-permittivity dielectric structures in clinical and ultra-high MRI. As an example, a metamaterial-inspired wireless coil (the so-called metasolenoid resonator) based on a periodic array of strongly coupled split-loop resonators was shown to be feasible for unilateral breast MRI at 1.5 T. 35 However, the proposed metamaterial-inspired device was linearly polarized, that is, it interacted with only one component (H y ) of the circularly polarized transverse RF magnetic field produced by the BC.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, artificial dielectrics [30][31][32][33] and metamaterial-inspired resonators [34][35][36][37] have overcome the limitations of natural materials and have proven to be a good alternative to the high-permittivity dielectric structures in clinical and ultra-high MRI. As an example, a metamaterial-inspired wireless coil (the so-called metasolenoid resonator) based on a periodic array of strongly coupled split-loop resonators was shown to be feasible for unilateral breast MRI at 1.5 T. 35 However, the proposed metamaterial-inspired device was linearly polarized, that is, it interacted with only one component (H y ) of the circularly polarized transverse RF magnetic field produced by the BC. As a consequence, first, only a half of the input power induced the linearly polarized wireless coil when the rotating field was co-directed with the coil polarization, and the remaining half of the power just dissipated in the body without contribution to the spin excitation.…”

Section: Introductionmentioning

confidence: 99%

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Quadrature transceive wireless coil: Design concept and application for bilateral breast MRI at 1.5 T

Puchnin

Jandaliyeva

Hurshkainen

et al. 2022

Magnetic Resonance in Med

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Purpose Development of a novel quadrature inductively driven transceive wireless coil for breast MRI at 1.5 T. Methods A quadrature wireless coil (HHMM‐coil) design has been developed as a combination of two linearly polarized coils: a pair of ‘metasolenoid’ coils (MM‐coil) and a pair of Helmholtz‐type coils (HH‐coil). The MM‐coil consisted of an array of split‐loop resonators. The HH‐coil design included two electrically connected flat spirals. All the wireless coils were coupled to a whole‐body birdcage coil. The HHMM‐coil was studied and compared to the linear coils in terms of transmit and SAR efficiencies via numerical simulations. A prototype of HHMM‐coil was built and tested on a 1.5 T scanner in a phantom and healthy volunteer. We also proposed an extended design of the HHMM‐coil and compared its performance to a dedicated breast array. Results Numerical simulations of the HHMM‐coil with a female voxel model have shown more than a 2.5‐fold increase in transmit efficiency and a 1.7‐fold enhancement of SAR efficiency compared to the linearly polarized coils. Phantom and in vivo imaging showed good agreement with the numerical simulations. Moreover, the HHMM‐coil provided good image quality, visualizing all areas of interest similar to a multichannel breast array with a 32% reduction in signal‐to‐noise ratio. Conclusion The proposed quadrature HHMM‐coil allows the normalB1+$$ {\mathrm{B}}_1^{+} $$‐field to be significantly better focused in the region‐of‐interest compared to the linearly polarized coils. Thus, the HHMM‐coil provides high‐quality breast imaging on a 1.5 T scanner using a whole‐body birdcage coil for transmit and receive.

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Section: Discussionmentioning

confidence: 99%

Section: Electromagnetic Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quadrature transceive wireless coil: Design concept and application for bilateral breast MRI at 1.5 T

Puchnin

Jandaliyeva

Hurshkainen

et al. 2022

Magnetic Resonance in Med

Self Cite

View full text Add to dashboard Cite

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“…Inductively coupled transmission allows the analog signal to be wirelessly transferred between two or more additional coils placed in the scanner bore, 42 which has no data rate transmission requirements because the signal is not digitized in-bore. Further, this method of data transfer uses minimal electronics to sever the cable connection in the bore but requires careful setup 43,44 and can decrease SNR, 45 which reduces patient throughput and image quality. The alternative far-field methods for wireless MRI have mostly used additional 2.4-or 5-GHz WiFi (eg, 802.11 b/g/n/a/c) 46 and WiGig 60-GHz (eg, 802.11 ad) (Fig.…”

Section: Wireless Rf Coil Arrays For Wireless Mri Data Transfermentioning

confidence: 99%

Recent Advances in Radio‐Frequency Coil Technologies: Flexible, Wireless, and Integrated Coil Arrays

Darnell

Truong

Song

2021

Magnetic Resonance Imaging

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Radio-frequency (RF) coils are to magnetic resonance imaging (MRI) scanners what eyes are to the human body. Because of their critical importance, there have been constant innovations driving the rapid development of RF coil technologies. Over the past four decades, the breadth and depth of the RF coil technology evolution have far exceeded the space allowed for this review article. However, these past developments have laid the very foundation on which some of the recent technical breakthroughs are built upon. Here, we narrow our focus on some of the most recent RF coil advances, specifically, on flexible, wireless, and integrated coil arrays. To provide a detailed review, we discuss the theoretical underpinnings, experimental implementations, promising results, as well as future outlooks covering these exciting topics. These recent innovations have greatly improved patient comfort and ease of scan, while also increasing the signal-to-noise ratio, image resolution, temporal throughput, and diagnostic and treatment accuracy. Together with advances in other MRI subfields, they will undoubtedly continue to drive the field forward and lead us to an ever more exciting future. Level of Evidence: 5 Technical Efficacy: Stage 1

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Helmholtz Coil‐Inspired Volumetric Wireless Resonator for Magnetic Resonance Imaging

Zhu,

Wu,

Anderson

et al. 2023

Adv Materials Technologies

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Signal‐to‐noise ratio (SNR) is one of the most common metrics in assessing the image quality of magnetic resonance imaging (MRI). Among a host of technological developments, various wireless devices, including metamaterials and volumetric wireless resonators have been reported to enhance SNR by redistributing the radio frequency magnetic field in the near field region. While theoretically feasible, their widespread clinical adoption has been limited by their field inhomogeneity, limited spatial coverage and challenges in their applications to higher field (≥3.0T) MRI systems. In this study, a Helmholtz coil‐inspired volumetric wireless resonator (HVWR) featuring a uniform magnetic field enhancement within the resonator volume is reported. The HVWR is free from cables, adapters and interface boxes, allowing for ease of fabrication and straightforward installation. The resonator allows for resonance frequency tunability and adaptivity, enabling for passive detuning during the MRI transmission phase. Experimental validation using a 3.0T MRI system demonstrate a substantial SNR boost (5× or higher) being achieved in a region covering the average size of the human knee. This study offers an efficient and practical wireless solution for improved MRI image quality that may be applicable across a range of imaging applications.

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Metamaterial inspired wireless coil for clinical breast imaging

Cited by 16 publications

References 22 publications

Quadrature transceive wireless coil: Design concept and application for bilateral breast MRI at 1.5 T

Quadrature transceive wireless coil: Design concept and application for bilateral breast MRI at 1.5 T

Recent Advances in Radio‐Frequency Coil Technologies: Flexible, Wireless, and Integrated Coil Arrays

Helmholtz Coil‐Inspired Volumetric Wireless Resonator for Magnetic Resonance Imaging

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