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A z-gradient array coil with a dedicated active-shielded array coil for MRI.

Manouchehr Takrimi1, Ergin Atalar1,2

  • 1National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey.

Magnetic Resonance in Medicine
|August 2, 2022
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Summary
This summary is machine-generated.

This study introduces a customizable array-based z-gradient coil for MRI, offering dynamic adjustment of imaging volumes and enhanced performance over conventional coils. The novel design enables a wide range of magnetic field profiles for diverse applications.

Keywords:
active shieldarray coilgradient coilmagnetic profiletunable imaging volume

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Gradient Coil Technology
  • Biomedical Engineering

Background:

  • Conventional z-gradient coils in MRI have limitations in customization and performance.
  • Developing advanced gradient coil designs is crucial for improving MRI capabilities.

Purpose of the Study:

  • To introduce and validate an array-based z-gradient coil with programmable power amplifiers.
  • To demonstrate its capability for outperforming conventional coils and offering tunable features.

Main Methods:

  • Utilized a pair of independent arrays and a modified optimization procedure based on analytic equations.
  • Implemented two modes: standard (conventional resemblance) and advanced (controllable feeding mechanism for parameter adjustment).
  • Employed commercial software to verify the coil's validity and feasibility.

Main Results:

  • The array-based coil achieved dynamic adjustment of the imaging volume.
  • Demonstrated four distinct magnetic profiles with varying gradient strengths (up to 370 mT/m), region of interest sizes (up to 120 mm), and slew rates (up to 6900 T/m/s).
  • The active-shielded design allowed for reverse feeding, enabling unique performance characteristics.

Conclusions:

  • The active-shielded gradient array coil allows for dynamic adjustment of magnetic field profiles.
  • This technology offers new features and a broad spectrum of field profiles for various MRI applications.
  • The proposed coil design enhances MRI flexibility and performance.