Abstract
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.
Highlights
Magnetic nanoparticles (MNP) offer a large variety of promising applications in medicine, e.g., magnetic hyperthermia and magnetic drug targeting [1]
We present the development of a 2D MRX imaging setup using commercially available optically pumped magnetometers (OPM) and multiple excitation coils, and demonstrate measurements with MNP
We presented quantification, 1D reconstruction, and 2D imaging of MNP by employing commercially available OPM for MRX imaging (MRXI)
Summary
Magnetic nanoparticles (MNP) offer a large variety of promising applications in medicine, e.g., magnetic hyperthermia and magnetic drug targeting [1]. For these applications, knowledge of the quantitative spatial MNP distribution is essential for treatment planning and supervision. Knowledge of the quantitative spatial MNP distribution is essential for treatment planning and supervision This information can be gathered by means of magnetorelaxometry (MRX) imaging. In MRX, the magnetic moments of the superparamagnetic MNP are aligned by applying an external magnetic field, forming a net magnetic moment.
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