Balancing control of paralleled full-bridge converters in high-current gradient amplifiers for MRI applications

Kumar, Misha; Huber, L.; Huang, He; Shen, Z. John; Huang, Jin

doi:10.1109/apec39645.2020.9124390

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The 1-D MRI imaging equation [1] can be written as follows: (z,t) dz. (7) The MRI image can be obtained by inverse Fourier transform of (7). The gradient magnetic field is the critical factor to determine the phase φ G (z, t) in (7), which can be expressed as follows:…”

Section: B Resolution Characterization In Mri and Gradient Power Ampl...mentioning

confidence: 99%

“…It can be seen that the minimum resolution step size defined in (1) and ( 2) is presented in MRI 1-D imaging (7) with the phase (8) and (9). The resolution characteristic of the gradient magnetic field can be defined as the standard deviation of the phase φ G (t), and the gradient field is generated by the GPA output current.…”

Section: B Resolution Characterization In Mri and Gradient Power Ampl...mentioning

confidence: 99%

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Resolution Improvement in a High-Power Magnetic Resonance Imaging Gradient Power Amplifier

Zeng

Popović

Rietveld

et al. 2022

IEEE Trans. Power Electron.

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High-resolution gradient power amplifiers are required to generate high-fidelity gradient fields in magnetic resonance imaging (MRI) systems. Various aspects of gradient power amplifiers have been the subject of research in the past years, however, systematic analysis and design methods for its resolution improvement have not been sufficiently addressed. This article addresses this research gap with comprehensive analysis and design methods for resolution improvement. First, a method for systematic resolution characterization of the MRI gradient power amplifier with gradient coil is proposed. Second, noise modeling with respect to the critical aspects in the system resolution degradation is developed and discussed. Third, the resolution improvement methods of bandwidth optimization, pseudorandom code modulation, and utilizing silicon carbide (SiC) switching power devices are proposed and analyzed, achieving a resolution at the one part in 10 6 level. Finally, the resolution improvement methods are experimentally validated in a 1000 V/400 A SiC gradient power amplifier. The experimental results show a 3.6 times reduction in the peak spurious signals and resolution improvement at all current levels and pulse lengths, compared to a conventional insulated gate bipolar transistor GPA. These results prove the validity of the proposed methods for resolution improvement in a high-power MRI gradient power amplifier, enabling future high-power and high-resolution amplifier designs.

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Section: B Resolution Characterization In Mri and Gradient Power Ampl...mentioning

confidence: 99%

Section: B Resolution Characterization In Mri and Gradient Power Ampl...mentioning

confidence: 99%

Resolution Improvement in a High-Power Magnetic Resonance Imaging Gradient Power Amplifier

Zeng

Popović

Rietveld

et al. 2022

IEEE Trans. Power Electron.

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show abstract

A New Repetitive Flat-top Pulsed Magnetic Field Power Supply for Gradient Driver in MRI

Zhang

Ding

et al. 2022

2022 IEEE 3rd China International Youth Conference on Electrical Engineering (CIYCEE)

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A Single DC Source Gradient Driver Circuit With Boosting Output Capability for MRI Applications

Naghipour

Beiranvand

2024

IEEE Trans. Ind. Electron.

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Balancing control of paralleled full-bridge converters in high-current gradient amplifiers for MRI applications

Cited by 3 publications

References 6 publications

Resolution Improvement in a High-Power Magnetic Resonance Imaging Gradient Power Amplifier

Resolution Improvement in a High-Power Magnetic Resonance Imaging Gradient Power Amplifier

A New Repetitive Flat-top Pulsed Magnetic Field Power Supply for Gradient Driver in MRI

A Single DC Source Gradient Driver Circuit With Boosting Output Capability for MRI Applications

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