A5015720103- Advanced MRI Techniques and Applications
- Antenna Design and Analysis
- Advanced NMR Techniques and Applications
- Wireless Body Area Networks
- Microwave Imaging and Scattering Analysis
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Atomic and Subatomic Physics Research
- Wireless Power Transfer Systems
- Electron Spin Resonance Studies
- Metamaterials and Metasurfaces Applications
- Ultrasound and Hyperthermia Applications
- Full-Duplex Wireless Communications
- Electromagnetic Compatibility and Measurements
- Lanthanide and Transition Metal Complexes
- Electromagnetic Fields and Biological Effects
- Medical Imaging Techniques and Applications
- Ultrasound Imaging and Elastography
- Particle Accelerators and Free-Electron Lasers
- Antenna Design and Optimization
- NMR spectroscopy and applications
- Plasmonic and Surface Plasmon Research
- Microwave Engineering and Waveguides
- Photoreceptor and optogenetics research
- Photonic Crystals and Applications
ITMO University
2016-2025
Institute of Information Technologies
2019-2020
Abstract In this paper, we propose, design and test a new dual-nuclei RF-coil inspired by wire metamaterial structures. The coil operates as result of resonant excitation hybridized eigenmodes in multimode flat periodic structures comprising several coupled thin metal strips. It was shown that the field distribution (i.e. penetration depth) can be controlled independently at two different Larmor frequencies selecting proper eigenmode each mutually orthogonal proposed requires no lumped...
Hyperbolic metasurfaces have gained significant attention due to their extraordinary electromagnetic properties control propagating plane waves, but the excitation and propagation of surface plasmon-polaritons at hyperbolic metasurfaces, called plasmons, been experimentally observed just recently. However, advantages such as hybrid TE-TM polarization discussed below, are not yet fully revealed analyzed. In this paper we focus on numerical experimental characterization waves in frequency...
Particular applications in preclinical magnetic resonance imaging require the entire body of an animal to be imaged with sufficient quality. This is usually performed by combining regions scanned small coils high sensitivity or long scans using large low sensitivity. Here, a metamaterial-inspired design employing parallel array wires operating on principle eigenmode hybridization was used produce small-animal coil. The coil field distribution responsible for view and simulated...
Phased antenna arrays of dipoles are widely used in ultrahigh field (UHF) magnetic resonance imaging for creating the controllable radio frequency (RF) distributions a human body. Due to safety and quality reasons each individual channel array should be decoupled-electromagnetically isolated from others. The required number channels is large some techniques dipole antennas located close proximity Their ultimately dense arrangement leads strong mutual coupling makes conventional decoupling...
We demonstrate experimentally giant spatial-dispersion-induced birefringence in metamaterials. The difference between the reflection coefficients for $(1,\overline{1},0)$- and $(0,0,1)$-polarized light reflected from $[1,1,0]$ surface of a metamaterial reaches $78%$. magnitude transparency windows structure ${n}_{1\overline{1}0}\ensuremath{-}{n}_{001}=\ensuremath{-}0.13$, which is at least three orders larger than typical values reported natural crystals. Our results elucidate important role...
Purpose Development of a novel quadrature inductively driven transceive wireless coil for breast MRI at 1.5 T. Methods A (HHMM‐coil) design has been developed as combination two linearly polarized coils: pair ‘metasolenoid’ coils (MM‐coil) and Helmholtz‐type (HH‐coil). The MM‐coil consisted an array split‐loop resonators. HH‐coil included electrically connected flat spirals. All the were coupled to whole‐body birdcage coil. HHMM‐coil was studied compared linear in terms transmit SAR...
In this letter, we theoretically and experimentally prove the possibility of complete passive decoupling for two parallel resonant dipoles by a split-loop resonator. Unlike previously achieved similar dipole, technique allows us to avoid shrink operation band. Compare previous work, simulation measurement show 100\% enhancemnet relative band from 0.2% 0.4%
We report decoupling of two closely located resonant dipole antennas dedicated for ultra-high field magnetic resonance imaging (MRI). show that a scatterer slightly raised over the plane grants sufficient even separated by very small gap (below 1/30 wavelength). compare operation scatterers. One them is shortcut and another split-loop resonator (SLR). Previously, we have shown SLR offers wider operational band than same level decoupling. However, it was so an array in free space. The...
In this letter, we describe a dedicated radio frequency (RF) coil for magnetic resonance imaging and spectroscopy at 4.7 T optimized investigation of muscle energetics in human forearm. The operating the Larmor frequencies protons $^1$H (200.1 MHz) phosphorous $^{31}$P (81 is based on two cylindrical periodic structures made thin metal wires with tips interconnected through structural capacities printed overlapping patches sliding electric contacts. By independently exciting orthogonal...
Commonly an artificial magnetic shield is used to improve antenna radiation in the far-field region, thanks in-phase reflection of electromagnetic waves. Here authors study possibility constructive field interference with respect $n\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}r\ensuremath{-}f\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}d$ region. This effect useful resonance imaging, where a conductive scanned sample...
Wireless dedicated radiofrequency coils have recently proven to be a good alternative conventional cable-connected due compatibility with the scanners of different vendors. Due significant increase B1+ respect body coil manual calibration procedure needed often for operation wireless coils. The goal this work is develop first Rx-only breast MRI overcome aforementioned drawback. For that passive detuning structure inserted Helmholtz resonator was designed and studied.
Wireless radio frequency coils provide a promising solution for clinical MR applications due to several benefits, such as cable-free connection and compatibility with platforms of different vendors. Namely, the purpose high-field human breast imaging wireless transceiver are known date, those operational principle is based on inductive coupling body coil. These commonly consist volume resonators perform bilateral imaging. Due electrically close location resonators, strong observed, resulting...
Purpose To demonstrate the feasibility of using octafluorocyclobutane (OFCB, c‐C 4 F 8 ) for T 1 mapping lungs in 19 MRI. Methods The study was performed at 7 three healthy rats and with pulmonary hypertension. increase sensitivity MRI, a bent‐shaped RF coil periodic metal strips structure used. double flip angle method used to calculate normalized transmitting field (B 1n + maps correcting built variable (VFA) method. ultrashort TE pulse sequence applied acquiring MR images throughout...
In this contribution we propose a novel antenna design (so-called radio-frequency coil) for magnetic resonance imaging and spectroscopy (MRSI). The is based on dual-layer periodic structure of thin metal wires inspired by wire medium resonators. Extremities selected are paired connection through structural capacity to ensure electrically small dimensions the coil suitability preclinical clinical MRSI. supports multiple hybridized eigenmodes, which fall into two independent classes with...
In this paper, we demonstrate a quadrature radiofrequency wireless coil to improve breast MRI at 1.5 T. The is based on the combination of metamaterial-inspired resonator and Helmholtz-type resonator. Numerical experimental studies bilateral have shown that it increases transmit efficiency whole-body birdcage by 7-fold safety 4.3 times.