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A novel method for magnetic particle imaging that exploits the change in transmitted light intensity of magnetic nanoparticles in the presence of a magnetic field allows for high resolution and sensitive imaging of magnetic nanoparticles. Since the method uses direct optical imaging, the theoretical resolution is no longer governed by the properties of the material, but depends on the optical diffraction limit. In future work, it is expected that high-resolution magnetic nanoparticle imaging in vivo will be achieved by selecting wavelengths of light that have a high penetration capacity into biological tissue.