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Experimental amplifiers used for MPI imaging. MPI signals from the detector coil (with L of 500 μH and RL of 5 Ω are filtered for direct feedthrough interference [25] using a custom notch filter prior to signal amplification using (a) Berkeley custom low-noise amplifier and transformer setup as presented in this work, (b) directly connected to an SR560 preamplifier with 200 gain, and (c) a noninverting amplifier using the CLC1002 op amp with gain around 24.
