Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Detection of Magnetic Nanoparticles in Tissue Using Magneto-Motive DP-OCT

  • Oh, Jung-Hwan (University of Texas M.D. Anderson Cancer Center) ;
  • Lee, Ho (School of Mechanical Engineering, Kyungpook National University) ;
  • Kim, Jee-Hyun (Computer Engineering Department, Kyungpook National University)
  • Received : 2006.10.23
  • Published : 2007.03.25
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Abstract

We demonstrate the capability of differential-phase optical coherence tomography (DP-OCT) to detect superparamagnetic iron oxide (SPIO) nanoparticles taken up by liver parenchymeal macrophages (Kupffer cells). We apply an external time-varying high-intensity focused magnetic field. Our experiments demonstrate a novel diagnostic modality to detect macrophages that have taken up SPIO nanoparticles. Magnetic force acting on the nanoparticles was varied by applying a sinusoidal current to a solenoid containing a conical iron core that substantially increased and focused the magnetic field strength ($B_{max}$ = 2 Tesla). $ApoE^{-/-}$ mice were sacrificed 2 days post intravenous injections of different SPIO doses (1.0, and 0.1 mmol Fe/kg body weight). Livers of $ApoE^{-/-}$ mice with and without injection of SPIO nanoparticles were investigated using DP-OCT, which detects tissue movement with nanometer resolution. Frequency response of iron-laden liver movement was twice the stimulus frequency. Movement was not observed in livers of control mice. Results of our experiments indicate DP-OCT is a candidate methodology to detect tissue based macrophages containing SPIO nanoparticles excited by an external focused magnetic field.

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References

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