Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging

Chi, Zhonghai; Yi, Yi; Wang, Yakui; Wu, Maopeng; Wang, Lixue; Zhao, Xihai; Meng, Yonggang; Zheng, Zhuozhao; Zhao, Qian; Zhou, Ji

doi:10.1002/adma.202102469

Cited by 28 publications

(27 citation statements)

References 42 publications

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“…The increased intensity of magnetic field will allow the acquisition of anatomical and functional information at high resolution. Among the various practical designs of RF coils used for NMR imaging and EUHF MRI, birdcage RF coils are widely used, with applications ranging from low-field MRI systems to ultra-high-end MRI systems [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90]. Recently, BC RF coils have been actively used in clinical applications [8,83,84] and pre-clinical animal experimental studies [85,86].…”

Section: Resultsmentioning

confidence: 99%

“…Among the various practical designs of RF coils used for NMR imaging and EUHF MRI, birdcage RF coils are widely used, with applications ranging from low-field MRI systems to ultra-high-end MRI systems [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90]. Recently, BC RF coils have been actively used in clinical applications [8,83,84] and pre-clinical animal experimental studies [85,86]. In particular, it is widely used in multinuclear MRI requiring high SNR and uniformity [77,[87][88][89][90].…”

Section: Resultsmentioning

confidence: 99%

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A Preliminary Study for Reference RF Coil at 11.7 T MRI: Based on Electromagnetic Field Simulation of Hybrid-BC RF Coil According to Diameter and Length at 3.0, 7.0 and 11.7 T

Seo

Chung

2022

Sensors

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Magnetic resonance imaging (MRI) systems must undergo quantitative evaluation through daily and periodic performance assessments. In general, the reference or standard radiofrequency (RF) coils for these performance assessments of 1.5 to 7.0 T MRI systems have been low-pass-type birdcage (LP-BC) RF coils. However, LP-BC RF coils are inappropriate for use as reference RF coils because of their relatively lower magnetic field (B1-field) sensitivity than other types of BC RF coils, especially in ultrahigh-field (UHF) MRI systems above 3.0 T. Herein, we propose a hybrid-type BC (Hybrid-BC) RF coil as a reference RF coil with improved B1-field sensitivity in UHF MRI system and applied it to an 11.7 T MRI system. An electromagnetic field (EM-field) analysis on the Hybrid-BC RF coil was performed to provide the proper dimensions for its use as a reference RF coil. Commercial finite difference time-domain program was used in EM-field simulation, and home-made analysis programs were used in analysis. The optimal specifications of the proposed Hybrid-BC RF coils for them to qualify as reference RF coils are proposed based on their B1+-field sensitivity under unnormalized conditions, as well as by considering their B1+-field uniformity and RF safety under normalized conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Preliminary Study for Reference RF Coil at 11.7 T MRI: Based on Electromagnetic Field Simulation of Hybrid-BC RF Coil According to Diameter and Length at 3.0, 7.0 and 11.7 T

Seo

Chung

2022

Sensors

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“…While SNR penalty is a concern in double‐tuned coil design, particularly for clinical translation considering the acceptable acquisition time in clinical scenarios, this could be relieved by using separate and decoupled physical coils for different resonances within the same coil set 133 . The recent advances in metamaterials for proton coils in clinical setups 134 could also be considered in future X‐nuclei or dual‐tuned coil designs.…”

Section: Mn Mri/mrs Techniquesmentioning

confidence: 99%

MR‐Nucleomics: The study of pathological cellular processes with multinuclear magnetic resonance spectroscopy and imaging in vivo

Sun

Lin

et al. 2022

NMR in Biomedicine

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Clinical medicine has experienced a rapid development in recent decades, during which therapies targeting specific cellular signaling pathways, or specific cell surface receptors, have been increasingly adopted. While these developments in clinical medicine call for improved precision in diagnosis and treatment monitoring, modern medical imaging methods are restricted mainly to anatomical imaging, lagging behind the requirements of precision medicine. Although positron emission tomography and single photon emission computed tomography have been used clinically for studies of metabolism, their applications have been limited by the exposure risk to ionizing radiation, the subsequent limitation in repeated and longitudinal studies, and the incapability in assessing downstream metabolism. Magnetic resonance spectroscopy (MRS) or spectroscopic imaging (MRSI) are, in theory, capable of assessing molecular activities in vivo, although they are often limited by sensitivity. Here, we review some recent developments in MRS and MRSI of multiple nuclei that have potential as molecular imaging tools in the clinic.

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“…In early investigations, metasurfaces were designed to be planar, which only enhanced the MRI signal in shallow penetration 4,5 . Our recent work demonstrated a cylindrical and compact metasurface device that provides homogeneous SNR enhancement when wrapped around human wrists 6 . The metasurface device, with the body coil as receiving coil, can significantly amplify the RF receiving field and achieve two to three folds SNR enhancement compared to a four‐channel flexible coil, thus can be used as an alternative surface coil in clinical wrist MRI.…”

Section: Introductionmentioning

confidence: 99%

In vivo MRI of knee using a metasurface‐inspired wireless coil

Yi,

Chi,

Wang

et al. 2023

Magnetic Resonance in Med

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PurposeTo investigate the application of a metasurface‐inspired wireless coil and evaluate its performance in clinical knee MRI.MethodsA metasurface surface coil is designed for knee MRI at 1.5T. The image SNR and uniformity are assessed using a water phantom. In vivo studies are performed on 10 healthy volunteers (age range, 24–30 y; three males) and two patients (ages 31 and 76 y; two males) with knee conditions. A commercial 4‐channel flexible coil and a 12‐channel knee coil are used for comparison. The SNRs of different tissues on knee MRI images are evaluated and compared. The image quality is evaluated using a five‐point Likert scale.ResultsThe SNRs of the images acquired by the metasurface coil with spine coil as receiving coil are similar to the 12‐channel knee coil, whereas the uniformity from groups where the metasurface coil was used is higher than that acquired by conventional coils in phantom studies. For in vivo knee MRI, the SNRs of the images acquired by the metasurface coil with spine coil as receiving coil are between that of the 4‐ and 12‐channel phased‐array coils. The image quality scores evaluated by radiologists are higher when metasurface is used.ConclusionThe metasurface‐inspired wireless coil is applicable to clinical knee MRI. When used in conjunction with the spine coil, it provides a favorable SNR between that of the 4‐ and 12‐channel phased‐array coil at 1.5T MRI system. The metasurface coil improves image uniformity regardless of which coil is used as the receiving coil.

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Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging

Cited by 28 publications

References 42 publications

A Preliminary Study for Reference RF Coil at 11.7 T MRI: Based on Electromagnetic Field Simulation of Hybrid-BC RF Coil According to Diameter and Length at 3.0, 7.0 and 11.7 T

A Preliminary Study for Reference RF Coil at 11.7 T MRI: Based on Electromagnetic Field Simulation of Hybrid-BC RF Coil According to Diameter and Length at 3.0, 7.0 and 11.7 T

MR‐Nucleomics: The study of pathological cellular processes with multinuclear magnetic resonance spectroscopy and imaging in vivo

In vivo MRI of knee using a metasurface‐inspired wireless coil

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