Control of the near magnetic field pattern uniformity inside metamaterial-inspired volumetric resonators

Jandaliyeva, Aigerim; Puchnin, Viktor; Slobozhanyuk, Alexey P.; Shchelokova, Alena

doi:10.1016/j.photonics.2021.100989

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…Finally, designing a solenoid coil for breast imaging is challenging, since its entire wire length should not exceed half of the wavelength, 50 meaning that we can use only five turns for a solenoid coil with the same height and diameter, which limits the resulting magnetic field amplitude and homogeneity. Another significant advantage of the proposed HHMM-coil design is its feasible tuning to any magnitude of the static magnetic field, including 7 T. 51 Besides, the quadrature coil design may be further optimized by eliminating rings in the center of the M-coil 52 to include specific openings for MRI-guided biopsy procedures. 53 In addition, the device can be combined with advanced pulse sequences demanding a high SAR 54 due to its increased RF safety, and with deep learning methods [55][56][57] for improved diagnostics of breast disorders.…”

Section: Discussionmentioning

confidence: 99%

“…Another significant advantage of the proposed HHMM‐coil design is its feasible tuning to any magnitude of the static magnetic field, including 7 T 51 . Besides, the quadrature coil design may be further optimized by eliminating rings in the center of the M‐coil 52 to include specific openings for MRI‐guided biopsy procedures 53 . In addition, the device can be combined with advanced pulse sequences demanding a high SAR 54 due to its increased RF safety, and with deep learning methods 55‐57 for improved diagnostics of breast disorders.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

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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Volumetric wireless coils for breast MRI: A comparative analysis of metamaterial-inspired coil, Helmholtz coil, ceramic coil, and solenoid

Jandaliyeva,

Puchnin,

Shchelokova

2024

Journal of Magnetic Resonance

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Quasi-BIC realized in a subwavelength volumetric split ring-based resonator

Geyman,

Puchnin,

Slobozhanyuk

et al. 2024

Applied Physics Letters

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In recent years, resonant structures with quasi-bound states in the continuum (quasi-BICs) have significantly expanded the practical possibilities in optics and nanophotonics. A similar mode, the so-called supercavity mode, observed in single dielectric cylinders with high permittivity and low material losses, allows achieving extremely high quality (Q) factors. Resonators supporting quasi-BICs are also promising for applications in the radio frequency range. However, creating compact structures using high-permittivity materials at frequencies below 300 MHz is challenging. This study introduces a subwavelength (∼λ/13) volumetric structure composed of two arrays of coupled split ring resonators, with one array located inside the other, which provides a supercavity mode. The numerical Q factor of this mode is increased by approximately 100 times under lossless conditions and by about 1.5 times when accounting for material losses compared to that of non-interacting modes of the two arrays. The Q factor enhancement is confirmed experimentally by near-field measurements. The advantages of the proposed resonator include its hollow cavity, ease of fabrication, and frequency tunability within the radio frequency range.

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Control of the near magnetic field pattern uniformity inside metamaterial-inspired volumetric resonators

Cited by 6 publications

References 19 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

Volumetric wireless coils for breast MRI: A comparative analysis of metamaterial-inspired coil, Helmholtz coil, ceramic coil, and solenoid

Quasi-BIC realized in a subwavelength volumetric split ring-based resonator

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