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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: IEEE Trans Med Imaging. 2019 Feb 11;38(10):2389–2399. doi: 10.1109/TMI.2019.2898202

Fig. 4. Receive chain modifications and direct feedthrough mitigation in pulsed MPI.

Fig. 4.

(a) Hardware modifications can be made to address the different nature of feedthrough in pulsed MPI. In addition to gradiometric attenuation, we can mitigate the temporally localized feedthrough spikes of pulsed MPI using tools such as variable gain amplifiers, shunt capacitors, and protection diodes. (b) Experimental feedthrough in pulsed MPI, which manifests as a narrow spike coinciding with each excitation pulse. Feedthrough not removed by fine gradiometric tuning [31] is significantly decoupled from the tracer signal decay. Time-domain baseline subtraction is not typically required using our AWR in pulsed MPI mode.