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

[76884]
Title: A high power driving and selection field coil for an open MPI scanner. <em>2013 3rd International Workshop on {Magnetic Particle Imaging} ({IWMPI}), IEEE Xplore Digital Library</em>
Written by: G. Bringout, H. Wojtczyk, W. Tenner, M. Graeser, M. Grüttner, J. Haegele, R. Duschka, N. Panagiotopoulos, F.M. Vogt, J. Barkhausen and T.M. Buzug
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DOI: 10.1109/IWMPI.2013.6528332
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[BibTex]

Note: inproceedings

Abstract: Three Litz wires have been used in parallel in order to decrease the layer to layer voltage down to 4 {kV} and the coil voltage down to 8 {kV}. A two millimeter thick epoxy plate has been glued between each layer, in order to prevent any electrical breakdown between the layers. A special epoxy has been used to minimize the inner temperature of the coil, which reached 180°C with a dissipated power of 5.2 {kW}. The use of parallel Litz wire leads to currents having different phase angle in every wire which has to be corrected.

Conference Proceedings

[76884]
Title: A high power driving and selection field coil for an open MPI scanner. <em>2013 3rd International Workshop on {Magnetic Particle Imaging} ({IWMPI}), IEEE Xplore Digital Library</em>
Written by: G. Bringout, H. Wojtczyk, W. Tenner, M. Graeser, M. Grüttner, J. Haegele, R. Duschka, N. Panagiotopoulos, F.M. Vogt, J. Barkhausen and T.M. Buzug
in: (2013).
Volume: Number:
on pages:
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN:
how published:
Organization:
School:
Institution:
Type:
DOI: 10.1109/IWMPI.2013.6528332
URL:
ARXIVID:
PMID:

[BibTex]

Note: inproceedings

Abstract: Three Litz wires have been used in parallel in order to decrease the layer to layer voltage down to 4 {kV} and the coil voltage down to 8 {kV}. A two millimeter thick epoxy plate has been glued between each layer, in order to prevent any electrical breakdown between the layers. A special epoxy has been used to minimize the inner temperature of the coil, which reached 180°C with a dissipated power of 5.2 {kW}. The use of parallel Litz wire leads to currents having different phase angle in every wire which has to be corrected.