Quantitative 2D magnetorelaxometry imaging of magnetic nanoparticles using optically pumped magnetometers

Affiliation
Institute of Electrical and Biomedical Engineering, UMIT—Private University for Health Sciences, Medical Informatics and Technology, 6060 Hall in Tirol, Austria, aaron.jaufenthaler@umit.at
Jaufenthaler, Aaron;
Affiliation
Institute of Electrical and Biomedical Engineering, UMIT—Private University for Health Sciences, Medical Informatics and Technology, 6060 Hall in Tirol, Austria, peter.schier@umit.at
Schier, Peter;
Affiliation
Department Biosignals, PTB—Physikalisch-Technische Bundesanstalt, 10587 Berlin, Germany, Thomas.Middelmann@ptb.de
Middelmann, Thomas;
Affiliation
Department Biosignals, PTB—Physikalisch-Technische Bundesanstalt, 10587 Berlin, Germany, maik.liebl@ptb.de
Liebl, Maik;
Affiliation
Department Biosignals, PTB—Physikalisch-Technische Bundesanstalt, 10587 Berlin, Germany, Frank.Wiekhorst@ptb.de
Wiekhorst, Frank;
GND
101571045X
Affiliation
Institute of Electrical and Biomedical Engineering, UMIT—Private University for Health Sciences, Medical Informatics and Technology, 6060 Hall in Tirol, Austria, daniel.baumgarten@umit.at
Baumgarten, Daniel

For biomagnetical applications exploiting physical properties of magnetic nanoparticles (MNP), e.g., magnetic hyperthermia, knowledge about the quantitative spatial MNP distribution is crucial, which can be extracted by magnetorelaxometry (MRX) imaging. In this paper, we present quantification, quantitative 1D reconstruction, and quantitative 2D imaging of MNP by exploiting optically pumped magnetometers for MRX. While highlighting the potential of commercially available optically pumped magnetometers (OPM) for MRXI, we discuss current limitations of the used OPM. We show, that with our OPM setup, MNP can be precisely quantified with iron amounts down to ≈6 μg, which can be improved easily. With a 1D-reconstruction setup, point-like and complex MNP phantoms can be reconstructed quantitatively with high precision and accuracy. We show that with our developed 2D MRX imaging setup, which measures 12 cm by 8 cm, point-like MNP distributions with clinically relevant iron concentrations can be reconstructed precisely and accurately. Our 2D setup has the potential to be easily extended to a tomography styled (and thus slice-selective) 3D scanner, by adding a mechanical axis to the phantom.

Cite

Citation style:
Could not load citation form.

Rights

License Holder: © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Use and reproduction:

Export