Gradient Coil Design and Optimization for an Ultra-Low-Field MRI System

Shen, Sheng; Koonjoo, Néha; Kong, Xiaohan; Rosen, Matthew S.; Xu, Zheng

doi:10.1007/s00723-022-01470-2

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…First, we obtain the magnetic induction strength B Sensor (B x , B y , B z ) from the sensor. We compare B Sensor with the magnetic induction strengths corresponding to each of 10 × 10 × 10 indices e i in the first-level index by Equation (13). By retrieving the closest index e first to B Sensor , we can determine the first-level index that is nearest to B Sensor .…”

Section: Magnetic Field Fingerprint Positioning Algorithmmentioning

confidence: 99%

“…By adjusting the magnetic field, MRI selects the desired anatomic profile, then generates stable and clear human tissue images. 13 The gradient magnetic fields generated within MRI imaging system is notably intricate, industrial manufacturing of such a system is relatively complex. Based on the idea of gradient magnetic fields from MRI, this paper presents a magnetic field generation device using a pair of Maxwell coils, capable of producing a uniform gradient magnetic field corresponding to the geometric space for spatial localization.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic Resonance Imaging (MRI) system is widely used in medical imaging. By adjusting the magnetic field, MRI selects the desired anatomic profile, then generates stable and clear human tissue images 13 . The gradient magnetic fields generated within MRI imaging system is notably intricate, industrial manufacturing of such a system is relatively complex.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Uniform gradient magnetic field and spatial localization method based on Maxwell coils for virtual surgery simulation

Huang,

Deng,

Zhao

et al. 2024

Computer Animation & Virtual

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With the development of virtual reality technology, simulation surgery has become a low‐risk surgical training method and high‐precision positioning of surgical instruments is required in virtual simulation surgery. In this paper we design and validate a novel electromagnetic positioning method based on a uniform gradient magnetic field. We employ Maxwell coils to generate the uniform gradient magnetic field and propose two positioning algorithms based on magnetic field, namely the linear equation positioning algorithm and the magnetic field fingerprint positioning algorithm. After validating the feasibility of proposed positioning system through simulation, we construct a prototype system and conduct practical experiments. The experimental results demonstrate that the positioning system exhibits excellent accuracy and speed in both simulation and real‐world applications. The positioning accuracy remains consistent and high, showing no significant variation with changes in the positions of surgical instruments.

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Section: Magnetic Field Fingerprint Positioning Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Uniform gradient magnetic field and spatial localization method based on Maxwell coils for virtual surgery simulation

Huang,

Deng,

Zhao

et al. 2024

Computer Animation & Virtual

View full text Add to dashboard Cite

show abstract

“…It should be noted that the distance between the X and Y coils in the main coil and the shielding coil is around 0.005 m. The gradient coils obtained by the sharpening process and spatial coordinate separation meet the requirements of model parameters in the physical field. However, the distance between each group of coils is only 0.005 m. Attention should be drawn to the distance between the coils during the 3D modeling process to avoid entanglement interference [10].…”

Section: Gradient Coil Modelingmentioning

confidence: 99%

Simulation Study of Transient Eddy Current Effect in 3T Animal Gradient Coil

Yin,

Wang,

2023

J. Phys.: Conf. Ser.

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In the process of high-field magnetic resonance imaging (MRI), the eddy current modeling and simulation of the cold screen and metal parts are not highly accurate. To solve this problem, this paper uses the target field method to design a 3T animal gradient coil model. To get more realistic simulation results, a complex model including a gradient system, cryogenic vessel, cold screen, epoxy resin, and temperature holes was constructed. The model was refined using the finite element method, and the effects of eddy currents induced by the gradient coil on the cylindrical cryogenic container and cold screen in the superconducting magnetic resonance instrument under the state of multi-physical field coupling were simulated. The model effectively reflects the transient eddy current distributions on the cold screen and cryogenic vessel in the MRI system and their time-dependent temperature rise effects.

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“…Resonant diffusion imaging is an important diagnostic technique in the medical field, especially in nervous system fibers, brain tumors and brain fibers, brain structures, myocardial fibers, liver research and clinical diagnosis [1,2]. However, magnetic resonance design can't directly through experiments on the design, improvement, pulse train parameters of the magnetic resonance equipment verification and external environmental noise influence of shortcomings [3], magnetic resonance simulation can dynamically adjust the design parameters and simulate the external environment, determine the advantages and disadvantages of magnetic resonance design, so simulation in the design is very important [4,5]. The diffusion magnetic resonance simulation based on equation Bloch-Torrey can simulate the evolution law of the magnetic resonance signal in the time domain and the image of the movement of particles in each codirectional medium and anisotropic medium from a macroscopic perspective, and the image of diffusion imaging closest to the actual situation can be obtained [6].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Diffusion Magnetic Resonance Based on Chain Method

Liao,

Liu,

et al. 2023

J. Phys.: Conf. Ser.

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Magnetic resonance diffusion imaging is an important tool for pathology research, and the cost of instrument development is extremely high. The construction of simulation models can optimize the parameters of key components of the instrument on the numerical platform, which can greatly reduce the R&D cost and improve the success rate. In this paper, a chain magnetic resonance simulation calculation method is obtained based on equation Bloch-Torrey to simulate the signal change law caused by gradient coding and diffusion characteristics, and MATLAB is used to construct a numerical imitation model and write a simulation program. Based on this calculation method, the diffusion-weighted imaging, diffusion coefficient imaging and diffusion tensor imaging simulation experiments were carried out by using the spin-echo (SE) diffusion-weighted sequence, and the images and results were reconstructed by combining the anti-Fourier transform. Experiments show that the simulated images can accurately reflect the set simulation model, reconstruct the diffusion coefficient and tensor characteristics, and the chain magnetic resonance simulation calculation method deduced in this paper.

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Gradient Coil Design and Optimization for an Ultra-Low-Field MRI System

Cited by 10 publications

References 25 publications

Uniform gradient magnetic field and spatial localization method based on Maxwell coils for virtual surgery simulation

Uniform gradient magnetic field and spatial localization method based on Maxwell coils for virtual surgery simulation

Simulation Study of Transient Eddy Current Effect in 3T Animal Gradient Coil

Simulation of Diffusion Magnetic Resonance Based on Chain Method

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