title: Construction of orthogonal synchronized bi-directional field to enhance heating efficiency of magnetic nanoparticles.
abstract: Magnetic hyperthermia using magnetic nanoparticles (MNPs) has attracted considerable attention as one of the promising tumor therapy. The study has been developed under single magnetic field. Recently, we found that the immobile MNP may generate more heat under two synchronous ac magnetic fields than traditional single and circular polarized fields based on model simulation result. According to this finding we constructed an orthogonal synchronized bi-directional field (OSB field). The system contained two LC resonant inverters (L: inductor, C: capacitor) and both vertical and transverse ac magnetic fields were generated by two Helmholtz coils. To reduce the interference, the axis directional of two coils were arranged orthogonally. The experiments showed that the heating ability of aggregated MNPs is greatly enhanced under this newly designed OSB field without increasing the strength of magnetic field. The OSB field system provides a promising way for future clinical hyperthermia.
authors: Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan.
authors: Shih-Wei
authors: SW
authors: Chen
authors: Jr-Jie
authors: JJ
authors: Lai
authors: Chen-Li
authors: CL
authors: Chiang
authors: Cheng-Lung
authors: CL
authors: Chen
mesh_terms: D006979:Hyperthermia, Induced / Q000295:instrumentation / Q000379:methods; D055909:Magnetic Field Therapy / Q000295:instrumentation / Q000379:methods; D060526:Magnetic Fields; D058185:Magnetite Nanoparticles / Q000627:therapeutic use*; D008954:Models, Biological; D009369:Neoplasms / Q000628:therapy*
chemical_list: D058185:Magnetite Nanoparticles