Improved Estimation of the Magnetic Nanoparticle Diameter with a Magnetic Particle Spectrometer and Combined Fields

Sven Biederer¹, Tobias Knopp¹, Timo Frederik Sattel¹, Marlitt Erbe¹, Thorsten M. Buzug¹

In Magnetic Particle Imaging the iron-core size distribution is a very important criterion for the imaging quality as well as for a model based reconstruction. An estimation of such a distribution is possible by using magnetization spectra of a Magnetic Particle Spectrometer. In this contribution a method is presented to improve the condition of the minimization problem. For this purpose offset fields are added to the sinusoidal excitation of the Magnetic Particle Spectrometer. This leads to a more stable and robust estimation of the iron-core size distribution.