Field-Free Line Magnetic Particle Imaging Magnet Design Using Nested Halbach Cylinders

Ergor M., Bingölbali A.

IEEE MAGNETICS LETTERS, vol.13, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13
  • Publication Date: 2022
  • Doi Number: 10.1109/lmag.2022.3159446
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Keywords: Magnetic resonance imaging, Magnetic particle imaging, Imaging, Magnetic flux density, Permanent magnets, Solid modeling, Magnetization, Hard magnetic materials, magnetic particle imaging, field-free line, Halbach magnets, gradient field
  • Yıldız Technical University Affiliated: Yes


Magnetic particle imaging (MPI) is a novel imaging technique that is a promising candidate for practical use in the medical field. The field-free line (FFL) selection field method in MPI provides spatial encoding along a line, resulting in a faster acquisition time and enhanced sensitivity with increased signal-to-noise ratio. To obtain FFL, a magnet system was designed using nested Halbach rings with octagonal-shaped permanent magnets. In this specific study, simulation studies were implemented using this magnet system for a real case. For this purpose, gradient values and stabilities of the magnet system were calculated. In this investigation, a gradient field within 60 mm stability was obtained along each axis. The gradient field attained values up to 6.1 T/m, which is a highly important parameter for spatial resolution in MPI systems.