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

[76898]
Title: Enlarging the field of view in {Magnetic Particle Imaging} – A comparison. <em>{Magnetic Particle Imaging}</em>
Written by: M. Grüttner, T. F. Sattel, M. Graeser, H. Wojtczyk, G. Bringout, W. Tenner, and T. M. Buzug
in: <em>Springer Proceedings in Physics</em>. (2012).
Volume: Number: (140),
on pages: 249--253
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN: 978-3-642-24132-1 978-3-642-24133-8
how published:
Organization:
School:
Institution:
Type:
DOI: 10.1007/978-3-642-24133-8_40
URL: http://link.springer.com/chapter/
ARXIVID:
PMID:

[www] [BibTex]

Note: inproceedings

Abstract: {Magnetic Particle Imaging} evolves rapidly and human scanners are conceivable, already. However, the growing scanner size and therefore the increasing data within the field of view give rise to several unsolved problems. The reconstruction process, solving an inverse problem with the measured signal and the system function, is a storage consuming procedure for high resolution 3D imaging. Additionally, the size of the field of view strongly depends on the used gradient field and field amplitudes. Due to technical as well as medical limitations, such as specific absorption rates and peripheral nerve stimulation, the conventional procedures will not be sufficient to image large regions of interest. This paper compares and discusses approaches enlarging the field of view that might be used to reduce the reconstruction process and/or enlarge the field of view despite limited technical properties.

Conference Proceedings

[76898]
Title: Enlarging the field of view in {Magnetic Particle Imaging} – A comparison. <em>{Magnetic Particle Imaging}</em>
Written by: M. Grüttner, T. F. Sattel, M. Graeser, H. Wojtczyk, G. Bringout, W. Tenner, and T. M. Buzug
in: <em>Springer Proceedings in Physics</em>. (2012).
Volume: Number: (140),
on pages: 249--253
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN: 978-3-642-24132-1 978-3-642-24133-8
how published:
Organization:
School:
Institution:
Type:
DOI: 10.1007/978-3-642-24133-8_40
URL: http://link.springer.com/chapter/
ARXIVID:
PMID:

[www] [BibTex]

Note: inproceedings

Abstract: {Magnetic Particle Imaging} evolves rapidly and human scanners are conceivable, already. However, the growing scanner size and therefore the increasing data within the field of view give rise to several unsolved problems. The reconstruction process, solving an inverse problem with the measured signal and the system function, is a storage consuming procedure for high resolution 3D imaging. Additionally, the size of the field of view strongly depends on the used gradient field and field amplitudes. Due to technical as well as medical limitations, such as specific absorption rates and peripheral nerve stimulation, the conventional procedures will not be sufficient to image large regions of interest. This paper compares and discusses approaches enlarging the field of view that might be used to reduce the reconstruction process and/or enlarge the field of view despite limited technical properties.