Fig. 1From: Quantitative imaging of magnetic nanoparticles in an unshielded environment using a large AC susceptibility arraySchematic diagram of MC-ACB setup used for MNP measurements and quantitative 2D-reconstruction. A set of 19 lock-in amplifiers was used with the same reference signal that also fed the power amplifier. The current send to the excitation coils was monitored using an ammeter (Fluke-115) to keep the excitation field constant during all the signal acquisitionBack to article page