Dr.-Ing. Matthias Gräser

Universitätsklinikum Hamburg-Eppendorf (UKE)
Sektion für Biomedizinische Bildgebung
Lottestraße 55
2ter Stock, Raum 212
22529 Hamburg

Technische Universität Hamburg (TUHH)
Institut für Biomedizinische Bildgebung
Gebäude E, Raum 4.044
Am Schwarzenberg-Campus 3
21073 Hamburg

Tel.: 040 / 7410 25812
E-Mail: matthias.graeser(at)tuhh.de
E-Mail: ma.graeser(at)uke.de

Research Interests

  • Magnetic Particle Imaging
  • Low Noise Electronics
  • Inductive Sensors
  • Passive Electrical Devices

Curriculum Vitae

Matthias Gräser submitted his Dr.-Ing. thesis in january 2016 at the institute of medical engineering (IMT) at the university of Lübeck and is now working as a Research Scientist at the institute for biomedical imaging (IBI) at the technical university in Hamburg, Germany.  Here he develops concepts for Magnetic-Particle-Imaging (MPI) devices. His main aim is to improve the sensitivity of the imageing devices and improve resolution and application possibilities of MPI technology.

In 2011 Matthias Gräser started to work at the IMT as a Research Associate in the Magnetic Particle Imaging Technology (MAPIT) project. In this project he devolped the analog signal chains for a rabbit sized field free line imager. Additionally he developed a two-dimensional Magnetic-Particle-Spectrometer. This device can apply various field sequences and measure the particle response with a very high signal-to-noise ratio (SNR).

The dynamic behaviour of magnetic nanoparticles is still not fully understood. Matthias Gräser investigated the particle behaviour by modeling the particle behaviour with stochastic differential equations. With this model it is possible to simulate the impact of several particle parameters and field sequences on the particle response .

In 2010 Matthias Gräser finished his diploma at the Karlsruhe Institue of Technology (KIT). His diploma thesis investigated the nerve stimulation of magnetic fields in the range from 4 kHz to 25 kHz.

Journal Publications

[76916]
Title: Analyzing superparamagnetic iron oxide nanoparticles (spions) using electrical impedance spectroscopy. <em>2015 5th</em>
Written by: T. Welzel, C. Debbeler, M. Graeser, S. Kaufmann, R. Kusche, and K. Lüdtke-\-Buzug
in: <em>International Workshop on {Magnetic Particle Imaging} ({IWMPI}), IEEE Xplore Digital Library</em>. (2015).
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DOI: 10.1109/IWMPI.2015.7107062
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[BibTex]

Note: inproceedings

Abstract: Conventional methods to evaluate the size of superparamagnetic iron oxide nanoparticles ({SPIONs}) and their coatings used in magnetic particle imaging ({MPI}) include photon cross-correlation spectroscopy ({PCCS}) [1], atomic force microscopy ({AFM}) [1] and transmission electron microscopy ({TEM}) [2]. There is however still a potential for improvement as they are expensive and only able to analyze small sample quantities. In this work, a new method using electrical impedance spectroscopy is evaluated. With this method, it is possible to analyze macroscopic samples at low costs.

Conference Proceedings

[76916]
Title: Analyzing superparamagnetic iron oxide nanoparticles (spions) using electrical impedance spectroscopy. <em>2015 5th</em>
Written by: T. Welzel, C. Debbeler, M. Graeser, S. Kaufmann, R. Kusche, and K. Lüdtke-\-Buzug
in: <em>International Workshop on {Magnetic Particle Imaging} ({IWMPI}), IEEE Xplore Digital Library</em>. (2015).
Volume: Number:
on pages:
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN:
how published:
Organization:
School:
Institution:
Type:
DOI: 10.1109/IWMPI.2015.7107062
URL:
ARXIVID:
PMID:

[BibTex]

Note: inproceedings

Abstract: Conventional methods to evaluate the size of superparamagnetic iron oxide nanoparticles ({SPIONs}) and their coatings used in magnetic particle imaging ({MPI}) include photon cross-correlation spectroscopy ({PCCS}) [1], atomic force microscopy ({AFM}) [1] and transmission electron microscopy ({TEM}) [2]. There is however still a potential for improvement as they are expensive and only able to analyze small sample quantities. In this work, a new method using electrical impedance spectroscopy is evaluated. With this method, it is possible to analyze macroscopic samples at low costs.