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Simultaneous temperature and viscosity estimation capability via magnetic nanoparticle relaxation.

Mustafa Utkur1,2, Emine Ulku Saritas1,2,3

  • 1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey.

Medical Physics
|February 1, 2022
PubMed
Summary

Magnetic particle imaging (MPI) can now map temperature and viscosity simultaneously using magnetic nanoparticle (MNP) relaxation. This technique, TAURUS, offers potential for precise thermal ablation treatments.

Keywords:
magnetic nanoparticlesmagnetic particle imagingmagnetic particle spectroscopyrelaxationtemperature mappingviscosity mapping

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Area of Science:

  • Biomedical Imaging
  • Nanotechnology
  • Medical Physics

Background:

  • Magnetic particle imaging (MPI) utilizes magnetic nanoparticles (MNPs) as tracers.
  • MNP relaxation behavior is key to MPI's functional imaging.
  • MPI enables localized magnetic fluid hyperthermia (MFH), necessitating accurate temperature mapping.

Purpose of the Study:

  • Analyze temperature and viscosity effects on MNP relaxation.
  • Determine temperature and viscosity sensitivities of MNP relaxation time constants using TAURUS.
  • Enable simultaneous mapping of temperature and viscosity for MPI applications.

Main Methods:

  • Prepared 15 samples across four viscosity levels (0.9-3.6 mPa·s) and five temperatures (25-45°C).
  • Conducted experiments on an in-house arbitrary-waveform magnetic particle spectrometer (MPS) setup.
  • Estimated relaxation time constants via TAURUS and analyzed temperature/viscosity sensitivities at 60 operating points.

Main Results:

  • MNP relaxation decreased with amplitude and temperature, increased with frequency and viscosity (except at 1 kHz).
  • Temperature sensitivity reached 1.18%/°C; viscosity sensitivity was high at low frequencies (13.4%/mPa·s) but decreased above 3 kHz.
  • Simultaneous temperature and viscosity estimation is feasible using dual-frequency measurements; temperature-only estimation is possible above 3 kHz.

Conclusions:

  • TAURUS shows significant temperature and viscosity sensitivities for simultaneous parameter estimation.
  • This highlights potential for real-time monitored, localized thermal ablation in cancer treatment.
  • The findings support hybrid MPI-MFH systems for advanced therapeutic applications.