1. Phase-resolved magnetomotive OCT for imaging nanomolar concentrations of magnetic nanoparticles in tissues

    Phase-resolved magnetomotive OCT for imaging nanomolar concentrations of magnetic nanoparticles in tissues
    Magnetic nanoparticles (MNPs) are increasingly important in magnetic resonance and biomedical optical imaging. We describe a method for imaging MNPs by detecting nanoscale displacements using a phase-resolved spectral-domain optical coherence tomography (OCT) system. Biological tissues and phantoms are exposed to ~800 G magnetic fields modulated at 56 and 100 Hz to mechanically actuate embedded iron oxide MNPs (~20 nm diameter). Sensitivity to 27 μg/g (~2 nM) MNPs within tissue phantoms is achieved by filtering paramagnetic from diamagnetic vibrations. We demonstrate biological feasibility by imaging topically applied MNPs during their diffusion into an excised rat tumor over a 2 hour ...
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