We investigated two different arrangements of Halbach arrays for steering magnetic nanoparticles in cancer therapy. The arrays are arranged with permanent magnets where the strong and weak magnetic sides can be changed by rotating the single magnets. For deriving the magnetic force, two different fitting functions were analyzed and compared. Summarized, the magnetic force and, thus, the region where the particles are able to get washed out, can be adjusted using low-cost permanent magnets.

For wireless capsule endoscopy (WCE), precise localization is an open research topic. In this study, a novel differential magnetic localization method for WCE is proposed. The differential method prevents interference of the geomagnetic field. Therefore, the mean position and orientation errors were significantly reduced by three orders in magnitude to less than 0.1 mm and 0.1°, respectively. In the future, the simulation-based results will be validated in experiments.