Japanese version

Kyushu University, Faculty of Information Science and Electrical Engineering Advanced Magnetic Sensing Lab.

Research outline

(1) Development of measurement system for magnetic nanoparticle application

We develop the analysis software and the measurement system for evaluation of magnetic properties of magnetic nanoparticles (MNPs)
in order to obtain high resolution and high sensitivity for MNP detection and increase the efficiency of magnetic hyperthermia and magnetic nanoparticle imaging (MPI).
We also develop MPI system taking into account the magnetic properties of MNPs.

Magnetic moment distribution obtained by using SVD method, and fitting result by using a mixture of log-normal distributions. [1]

M-H curve obtained by using our developed measurement system (Resovist, 20 kHz) [2]

The 3D MNP distribition obtained by MPI system in our Lab. [3]

(2) Development of measurement system for non-destructive testing (NDT)

(2-1) Defect detection

　 We develop the NDT system using a high temperature superconducting (HTS) coil and evaluate by using the finite element method (FEM)
to evaluate deterioration of social infrastructure.

Magnetic field analysis result using FEM [4]

(2-2) Biomedical engineering

We develop the estimation method for tip position of a nasogastric tube to prevent incorrect insertion.
This research is conducted with Assoc. Prof. Gotoh, Oita University.

(a) System feature	(b) Position estimation result
Our developed system to estimate the tip position of a nasogastric tube. (a) System feature and (b) Position estimation result [5], [6]

References

[1] T. Sasayama, T. Yoshida, M. M. Saari, and K. Enpuku, "Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions," J. Appl. Phys., vol. 117, Art. ID. 17D155, 2015.
[2] T. Sasayama, T. Yoshida, K. Tanabe, N. Tsujimura, and K. Enpuku, "Hysteresis loss of fractionated magnetic nanoparticles for hyperthermia application," IEEE Trans. Magn., vol. 51, no. 11, Art. ID. 5101504, 2015.
[3] T. Sasayama, Y. Tsujita, M. Morishita, M. Muta, T. Yoshida, and Keiji Enpuku, "Three-dimensional magnetic nanoparticle imaging using small field gradient and multiple pickup coils ," J. Magn. Magn. Mater., vol. 427, pp. 143-149, 2017.
[4] T. Sasayama, T. Ishida, M. Matsuo, and K. Enpuku, "Thickness measurement of an iron plate using low frequency eddy current testing with an HTS coil," IEEE Trans. Appl. Supercond., vol. 26, no. 5, Art. ID. 9001305.
[5] T. Sasayama, Y. Gotoh, and K. Enpuku, "Application of minimum variance beamformer for estimation of tip position of a nasogastric tube," IEEE Trans. Magn., vol. 50, no. 11, Art. ID. 5101404, 2014.
[6] T. Sasayama, Y. Gotoh, and K. Enpuku, "Improving Estimation Accuracy of Nasogastric Tube Tip Position Using Predata," IEEE Trans. Magn., vol. 51, no. 11, Art. ID. 5101604, 2015.

Copyright(C) Teruyoshi Sasayama All rights reserved.