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We have developed a 2-D magnetic nanoparticle (MNP) imaging system using an orthogonal gradient field and third-harmonic signal detection. An ac excitation field was applied to generate third-harmonic signals from MNP on the basis of their nonlinear magnetization curves, and a dc gradient field was applied perpendicular to the excitation field. The dependence of the third-harmonic signal on the dc...
We developed a highly sensitive measurement system of ac magnetic fields for magnetic nanoparticle imaging (MPI). First, we developed a detection system using pickup coils made of cooled Cu Litz-wire and high-critical-temperature superconductor (HTS) tape. The pickup coils were connected to a resonant capacitor in order to enhance the signal voltage generated in the pickup coils. The magnetic field...
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