Magnetic Particle Imaging: Exploring Particle Mobility

Part of the Springer Proceedings in Physics book series (SPPHY, volume 140)


Magnetic Particle Imaging (MPI) is a promising new imaging modality, providing 3-dimensional imaging of magnetic nanoparticle tracers with high spatial and temporal resolution. Some recently developed experimental scanners have proven MPI to be feasible for small animal imaging. So far, one assumes that all particles contributing to the MPI signal share the same size distribution. An interesting extension of MPI would be to measure the mobility (or binding affinity) of the particles in the imaging volume. In this scenario, particles in certain regions may be partly immobilized by chemical binding, resulting in a transition from a Brownian to a Néel-dominated magnetization behavior – which is generally assumed for MNP tracers in blood. We propose that using two distinct frequencies, one below and one above the Brownian-Néel transition frequency, the binding state of the particles can be determined and utilized in MPI imaging. In this paper, we describe our MPI system and present simulations of 2-dimensional “Mobility MPI”.


Excitation Frequency Hydrodynamic Diameter Magnetic Fluid Spectral Purity Small Animal Imaging 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Gleich, B., Weizenecker, J.: Tomographic imaging using the nonlinear response of magnetic particles. Nature 435, 1214–1217 (2005)CrossRefGoogle Scholar
  2. 2.
    Weizenecker, J., Gleich, B., Rahmer, J., Dahnke, H., Borgert, J.: Three-dimensional real-time in vivo magnetic particle imaging. Phys. Med. Biol. 54, L1–L10 (2009)Google Scholar
  3. 3.
    Raikher, Y.L., Shliomis, M.I.: The effective field method in the orientational kinetics of magnetic fluids and liquid crystals. Adv. Chem. Phys. 87, 595–751 (1994)CrossRefGoogle Scholar
  4. 4.
    Yoshida, T., Enpuku, K.: Simulation and Quantitative Clarification of AC Susceptibility of Magnetic Fluid in Nonlinear Brownian Relaxation Region. Japan. J. Appl. Phys. 48, 127002 (2009)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Berlin Heidelberg 2012

Authors and Affiliations

  • Thilo Wawrzik
    • 1
  • Frank Ludwig
    • 1
  • Meinhard Schilling
    • 1
  1. 1.Institut für Elektrische Messtechnik und Grundlagen der ElektrotechnikTU BraunschweigBraunschweigGermany

Personalised recommendations