International Journal on Magnetic Particle Imaging IJMPI
Vol. 6 No. 2 Suppl 1 (2020): Int J Mag Part Imag

Proceedings Articles

Vector Modulator Based Active Compensation of Direct Feedthrough

Main Article Content

Bilal Tasdelen (Bilkent University), Ecrin Yagiz (Bilkent University), Mustafa Utkur (Bilkent University), Ahmet R. Cagil (Bilkent University), Can Barış Top (ASELSAN Research Center), Ergin Atalar (Bilkent University), Emine Ulku Saritas (Bilkent University)


In magnetic particle imaging (MPI), simultaneous excitation and signal acquisition leads to direct feedthrough problems.  While this direct-feedthrough can be mitigated up to some extent with passive compensation, this may not be sufficient given the time-variant nature of the system. Active compensation methods are proposed to overcome this challenge. In magnetic resonance imaging (MRI), we have recently proposed a promising active compensation technique that uses a vector modulator-like structure to modify a copy of the transmitted signal and use it for subtracting the direct-feedthrough in analog domain. In this work, this technique is adapted to MPI for active compensation of the direct-feedthrough. We demonstrate a significant increase in detection sensitivity at the fundamental harmonic on an in-house arbitrary waveform relaxometer.


Int. J. Mag. Part. Imag. 6(2), Suppl. 1, 2020, Article ID: 2009065, DOI: 10.18416/IJMPI.2020.2009065

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