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

[120376]
Title: Determining the Relation between Iron Mass and Spatial Resolution for a Human-Sized Magnetic Particle Brain Imager. <em>9th International Workshop on Magnetic Particle Imaging (IWMPI 2019)</em>
Written by: F. Thieben, M. Graeser, M. Boberg, P. Szwargulski, M. Moeddel, and T. Knopp
in: (2019).
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on pages: 41-42
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[BibTex]

Note: inproceedings, brainimager

Abstract: The determination of brain perfusion is an important issue for the diagnosis of vascular diseases. Since the total iron dose is limited, the ability to measure and resolve low iron concentrations is of great interest. In this work, we investigated the relation between decreasing iron mass and spatial resolution for a human-sized MPI brain imager. We find the full-width at half maximum of a small delta sample to be a good initial measure for the spatial resolution. In our experiments, the achievable resolution showed only slight decrease over one decade of iron mass.

Conference Proceedings

[120376]
Title: Determining the Relation between Iron Mass and Spatial Resolution for a Human-Sized Magnetic Particle Brain Imager. <em>9th International Workshop on Magnetic Particle Imaging (IWMPI 2019)</em>
Written by: F. Thieben, M. Graeser, M. Boberg, P. Szwargulski, M. Moeddel, and T. Knopp
in: (2019).
Volume: Number:
on pages: 41-42
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN:
how published:
Organization:
School:
Institution:
Type:
DOI:
URL:
ARXIVID:
PMID:

[BibTex]

Note: inproceedings, brainimager

Abstract: The determination of brain perfusion is an important issue for the diagnosis of vascular diseases. Since the total iron dose is limited, the ability to measure and resolve low iron concentrations is of great interest. In this work, we investigated the relation between decreasing iron mass and spatial resolution for a human-sized MPI brain imager. We find the full-width at half maximum of a small delta sample to be a good initial measure for the spatial resolution. In our experiments, the achievable resolution showed only slight decrease over one decade of iron mass.