International Journal on Magnetic Particle Imaging IJMPI
Vol 9 No 1 Suppl 1 (2023): Int J Mag Part Imag

Proceedings Articles

Configuring magnetoresistive sensor array for head-sized magnetic particle imaging

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Suko Bagus Trisnanto  , Tamon Kasajima (TDK Corporation), Tomohiko Shibuya (TDK Corporation), Yasushi Takemura  (Yokohama National University)


Magnetoresistive (MR) sensors offer a solution to enable unidirectional detection of sub-pT signal. Magnetic particle imaging (MPI) can benefit from this high sensitivity to challenge its operability under low excitation fields. Here, we built a prototype of brain MPI scanner by using MR sensor array to directly map stray fields of the magnetized magnetic nanoparticles. The array was a 13×13 matrix with 15 mm sensor pitch and installed at 100 mm apart from excitation coil with 200 mm in diameter. We magnetically compensated both the drive field and geomagnetism to position MR sensor at field-free environment. Preliminarily, we were able to detect a 37 mgFe ferrofluid sample at 50 mm apart from the array under field amplitudes up to 100 μT/μ0 at 10 kHz. The resulting noise level appears independent to the applied field, which becomes an advantage to further implement higher drive fields within magnetostimulation safety limits.

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