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. Author manuscript; available in PMC: 2015 Feb 21.
Published in final edited form as: Phys Med Biol. 2014 Feb 7;59(4):1047–1071. doi: 10.1088/0031-9155/59/4/1047

Figure 2.

Figure 2

Flowchart of the system. The DAC produces a current that is amplified and used to generate magnetic fields with the coils. This field interacts with the mNPs and the resulting magnetic induction field along with any uncompensated field is detected by the fluxgates. This field is amplified and sampled by an ADC. A digital lock-in amplifier determines the in-phase and out-of-phase field components for subsequent imaging algorithms.