| 1. |
Takashi Yoshida, Yuta Kamei, Yasushi TAKEMURA, Tatsuya Nagano, Akinobu Ide, Teruyoshi Sasayama, Development of magnetic particle imaging scanner using high-Tc superconducting coil, International Workshop on Magnetic Particle Imaging, 2024.03. |
| 2. |
Ziwei Guo, Teruyoshi Sasayama, Compensate Method for Excitation Field in Rectangular Wave Eddy Current Testing, International Symposium on Applied Electromagnetics and Mechanics (ISEM), 2023.11. |
| 3. |
Teruyoshi Sasayama, Shuji Taue, Takashi Yoshida, AC Susceptibility Measurement of Magnetic Nanoparticles Using an Optically Pumped Magnetometer, Magnetism and magnetic materials, 2023.11. |
| 4. |
Reiji Okawa, Yuta Takizawa, Shuji Taue, Yukinobu Hoshino, Teruyoshi Sasayama, Single-pixel imaging with optically pumped magnetometer for magnetic particle imaging, The Fourteenth Japan-Finland Joint Symposium on Optics in Engineering, 2023.08. |
| 5. |
Misaki Fujimoto, Naoya Futagawa, Kohta Higashino, Teruyoshi Sasayama, Takashi Yoshida, Investigation to Improve Stability in Magnetic Nanoparticle Tomography Using Direct Magnetic Field Compensation Circuit, Intermag 2023, 2023.05. |
| 6. |
Naoya Futagawa, Misaki Fujimoto, Kohta Higashino, Teruyoshi Sasayama, Takashi Yoshida, Imaging of Magnetic Nanoparticle Using Magnetic Particle Spectroscopy Data, Intermag 2023, 2023.05. |
| 7. |
Ziwei Guo, Teruyoshi Sasayama, Detection of Metal Surface and Back Surface by Rectangular Wave Eddy Current Testing with Magneto Resistive Sensor, Intermag 2023, 2023.05. |
| 8. |
Haochen Zhang, Yi Sun, Shuya Yamamura, Teruyoshi Sasayama, Takashi Yoshida, Dipolar Interaction Effect on Harmonics in Liner Chain Magnetic Nanoparticles, Intermag 2023, 2023.05. |
| 9. |
Teruyoshi Sasayama, Application of HTS Coil as High Sensitivity Magnetic Sensor to Non-Destructive Testing, East Asia Symposium on Superconductor Electronics, 2023.03. |
| 10. |
Teruyoshi Sasayama, Naoki Okamura, Kohta Higashino, Takashi Yoshida, Estimation Accuracy Improvement Of Magnetic Nanoparticle Tomography By Combining Inverse Solution Methods, 13th International Conference on the Scientific and Clinical Applications of Magnetic Carriers, 2022.06. |
| 11. |
Teruyoshi Sasayama, Ziwei Guo, Signal Enhancement of Rectangular Wave Eddy-Current Testing by Compensation with D/A Converter, International Symposium on Applied Electromagnetics and Mechanics (ISEM), 2022.06. |
| 12. |
Kohta Higashino, Naoki Okamura, Teruyoshi Sasayama, Takashi Yoshida, Square-Wave Inverter Excitation for Magnetic Nanoparticle Tomography, MMM-Intermag 2022, 2022.01. |
| 13. |
Naoki Okamura, Teruyoshi Sasayama, Takashi Yoshida, Inverse Problem Analysis in Magnetic Nanoparticle Tomography with Minimum Variance Spatial Filter, Intermag 2021, 2021.04. |
| 14. |
Teruyoshi Sasayama, Naoki Okamura, Takashi Yoshida, Improvement of sensitivity of magnetic nanoparticle imaging using pickup coil array for human-sized imaging, 2020 ICME International Conference on Complex Medical and Engineering(ICME CME2020), 2020.08, Purpose: Magnetic particle imaging (MPI) is expected to be a new in-vivo biomedical imaging technique that employs the characteristics of nonlinear magnetic response of magnetic nanoparticles (MNPs). MPI systems employ a DC gradient field, however, this is the hurdle to develop a practical MPI system for human-sized imaging because of the difficulty to generate large DC gradient field. Instead of using the gradient field coils, we employ a lot of pickup coils, i.e., pickup coil array to image the distribution of MNPs.
Methods: The Resovist MNP sample containing 100 μgFe was arranged in the AC magnetic field generated using an excitation coil. The third harmonic signals from MNPs were measured using 16 pickup coils that were located inside the excitation coil. To improve the sensitivity, we employed the cancelation circuit for the fundamental signal. Then, the two-dimensional concentration map of the MNP sample was obtained by solving an inverse problem with a non-negative least squares method. The estimation performance was evaluated by changing the distance between the sample and the excitation coil.
Results: The peak value of the concentration map was observed in the vicinity of the position of the MNP sample. The estimation error, which is the distance between the peak position and the actual position of the MNP sample, is within 10 mm even though the distance between the sample and the excitation coil is 50 mm.
Conclusion: Even though a gradient field is not used, the proposed system can estimate the position of MNP sample with good accuracy. The performance in this study suggests that the proposed system will be applicable to brain function imaging.. |
| 15. |
Teruyoshi Sasayama, Low-frequency Eddy current Testing Using a Magneto-impedance Sensor and Flux Transformer, Intermag 2020, 2020.05. |
| 16. |
Teruyoshi Sasayama, Naoki Okamura, Takashi Yoshida, Sensitivity Improvement of the Imaging of Magnetic Nanoparticle Distribution by Compensation Circuit with D/A Converter, Intermag 2020, 2020.05. |
| 17. |
Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, AC Magnetization of Immobilized Magnetic Nanoparticles with Different Degree of Parallel Alignment of Easy Axes, Intermag 2020, 2020.05. |
| 18. |
Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, 2D Imaging of Magnetic Nanoparticles using Multiple Pickup Coils and Amplitude Modulation , International Workshop on Magnetic Bio-Sensing, 2019.11. |
| 19. |
Kazuki Akiyoshi，Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Wash-Free Detection of C-reactive Protein Utilizing Cluster Formation of Magnetic Markers, International Workshop on Magnetic Bio-Sensing, 2019.11. |
| 20. |
Shigeya Yamashita, Masaaki Matsuo, Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Magnetometer Based on Inductance Modulation of High-Tc Superconducting Coil, International Workshop on Magnetic Bio-Sensing, 2019.11. |
| 21. |
Teruyoshi Sasayama , Wataru Yoshimura, Keiji Enpuku, Eddy current testing using square wave excitation current for detection of backside defect of steel plate, International Symposium on Applied Electromagnetics and Mechanics (ISEM), 2019.09. |
| 22. |
Teruyoshi Sasayama , Takashi Yoshida, Keiji Enpuku, Spatial distribution imaging of magnetic nanoparticles using pickup coil array, Joint European Magnetic Symposia (JEMS), 2019.08. |
| 23. |
Kazuki Akiyoshi , Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Wash-free detection of biological target utilizing agglomerate formation of magnetic markers, Joint European Magnetic Symposia (JEMS), 2019.08. |
| 24. |
Shigeya Yamashita , Masaaki Matsuo, Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Properties of magnetometer utilizing high-Tc superconducting coil and inductance modulation scheme, Joint European Magnetic Symposia (JEMS), 2019.08. |
| 25. |
Wataru Yoshimura, Teruyoshi Sasayama, Keiji Enpuku, Optimal Frequency of Low-frequency Eddy Current Testing for Detecting Cracks on the Posterior Side of Steel Plates, MMM-Intermag, 2019.01. |
| 26. |
A. L. Elrefai, T.Sasayama, T. Yoshida, and K. Enpuku, Effect of Viscosity on Harmonic Signals of Magnetic Nanoparticles for Temperature Measurement, International Workshop on Magnetic Bio-Sensing, 2018.11. |
| 27. |
S. Hamanaga, T. Sasayama, T. Yoshida, and K. Enpuku, Three Dimensional Imaging of Magnetic Nanoparticles Utilizing Field Free Line and Multiple Pickup Coils, International Workshop on Magnetic Bio-Sensing, 2018.11. |
| 28. |
K. Irie, K. Akiyoshi, T. Yoshida, T. Sasayama, and K. Enpuku, Wash Free Detection of Biological Target Utilizing Magnetic Markers and MR Sensor, International Workshop on Magnetic Bio-Sensing, 2018.11. |
| 29. |
Teruyoshi Sasayama, Ahmed L. Elrefai, Takashi Yoshida, Keiji Enpuku, Biomedical Applications of Magnetic Nanoparticles for Magnetic Particle Imaging, ICME International Conference on Complex Medical Engineering, 2018.09. |
| 30. |
Teuyoshi Sasayama and Keiji Enpuku, Back-Side Flaw Detection of Thick Steel Plate Using Three-Axis MR Sensor, The Sixth Japan-US NDT Symposium, 2018.07. |
| 31. |
Wataru Yoshimura, Ryo Tanaka, Teruyoshi Sasayama, Keiji Enpuku, Detection of Slit Defects on Backside of Steel Plate Using Low-Frequency Eddy-Current-Testing, Intermag 2018, 2018.04. |
| 32. |
Teruyoshi Sasayama, Yuji Gotoh, Keiji Enpuku, Tip Position Estimation Accuracy of Gastric Tube by Compensating Geomagnetic Field with Offset Coils, Intermag 2018, 2018.04. |
| 33. |
Ahmed Lotfy Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Empirical Expression for DC Magnetization Curve of Immobilized Magnetic Nanoparticles for Use in Biomedical Applications, MMM Conference, 2017.11. |
| 34. |
Takashi Yoshida, Yuki Matsugi, Takuru Nakamura, Teruyoshi Sasayama, Keiji Enpuku, Magnetic Fractionation of Magnetic Nanoparticles for Magnetic Particle Imaging, International Workshop on Magnetic Bio-Sensing, 2017.10. |
| 35. |
Teruyoshi Sasayama, Ahmed Lotfy Elrefai, Takashi Yoshida, Keiji Enpuku, Relaxation Measurement System for Magnetic Nanoparticles, International Workshop on Magnetic Bio-Sensing, 2017.10. |
| 36. |
Masahiro Muta, S. Hamanaga, N. Tanaka, Teruyoshi Sasayama, Keiji Enpuku, Three-dimensional Imaging of Magnetic Nanoparticles using Multiple Pickup Coils, International Workshop on Magnetic Bio-Sensing, 2017.10. |
| 37. |
Y. Takafuji, K. Irie, K. Akiyoshi, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Liquid-Phase Detection of Biomaterial Using Magnetic Markers, International Workshop on Magnetic Bio-Sensing, 2017.10. |
| 38. |
Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Distribution of Magnetic Nanoparticles Anisotropy Energy Estimated from AC Susceptibility and Magnetic Relaxation, 日本磁気学会学術講演, 2017.09. |
| 39. |
Teruyoshi Sasayama, Keiji Enpuku, Low-Frequency Eddy Current Testing using HTS coil and PWM Inverter, International Symposium on Applied Electromagnetics and Mechanics (ISEM), 2017.09. |
| 40. |
Teruyoshi Sasayama, Yuji Gotoh, Keiji Enpuku, Development and Evaluation of Tip Position Estimation System of Gastric Tube for Practical Applications, Intermag 2017, 2017.04. |
| 41. |
Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Magnetic Core-Size Distribution of Magnetic Nanoparticles Estimated from Magnetization, AC Susceptibility and Relaxation Measurements, Intermag 2017, 2017.04. |
| 42. |
Ryo Tanaka, Teruyoshi Sasayama, Masaaki Matsuo, Keiji Enpuku, Properties of Signal Caused by the Cracks on the Back Surface of Steel Plate in Low Frequency Eddy Current Testing, Intermag 2017, 2017.04. |
| 43. |
Takashi Yoshida, Yuki Matsugi, Teruyoshi Sasayama, Keiji Enpuku, Effect of Alignment of Magnetic Easy Axes on AC Magnetization of Immobilized Magnetic Nanoparticles, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 44. |
Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Biological Applications of Magnetic Nanoparticles for Magnetic Immunoassay and Magnetic Particle Imaging , PRiME 2016, 2016.10. |
| 45. |
Yuya Tsujita, Masahiro Muta, Teruyoshi Sasayama, Keiji Enpuku, Three-Dimensional Detection of Magnetic Nanoparticles Using Small Field Gradient and Multiple Pickup Coils, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 46. |
Kazushi Yamamoto, Teruyoshi Sasayama, Takashi Yoshida, Masaaki Matsuo, Keiji Enpuku, System Development for Single-Sided Magnetic Particle Imaging Using Electric Scanning of Field Free Point, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 47. |
Yuki Matsugi, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Evaluation of Harmonic Spectrum of Magnetic Nanoparticles for Magnetic Particle Imaging, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 48. |
Kota Nakamura, Yoshitsugu Takafuji, Teruyoshi Sasayama, Takashi Yoshida, and Keiji Enpuku, Highly Sensitive Liquid-Phase Immunoassays Using Brownian Relaxation of Magnetic Markers, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 49. |
Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Harmonic Signals of Immobilized Magnetic Nanoparticles for Magnetic Particle Imaging, International Workshop on Magnetic Bio-Sensing, 2016.10. |
| 50. |
Teruyoshi Sasayama, Yuya Tsujita, Manabu Morishita, Masahiro Muta, Keiji Enpuku, Three-Dimensional Magnetic Nanoparticle Imaging Using a Small Gradient Field and Multiple Pickup Coils, 11th International Conference on the Scientific and Clinical Applications of Magntic Carriers, 2016.06. |
| 51. |
Kazuhiro Tanabe, Shi Bai, Kazushi. Yamamoto, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Planar Gradient Coil and Electric Scanning of Field Free Point for Single-Sided Magnetic Particle Imaging, MMM-Intermag 2016, 2016.01. |
| 52. |
Manabu Morishita, Teruyoshi Sasayama, Keiji Enpuku, Yuya Tsujita, Depth Estimation in Magnetic Particle Imaging Using Cooled Pickup Coil, East Asian Symposium on Superconductive Electronics (EASSE), 2015.11. |
| 53. |
Tomoki Ishida, Teruyoshi Sasayama, Masaaki Matsuo, Keiji Enpuku, Eddy Current Testing Using HTS Coil for Measurement of Iron-plate Thickness, East Asian Symposium on Superconductive Electronics (EASSE), 2015.11. |
| 54. |
Masakazu Ura, Kohei Noguchi, Kota Nakamura, Takashi Yoshida, Teruyoshi Sasayama, Keiji Enpuku, Improved magnetization process in liquid-phase immunoassays using SQUID sensor, East Asian Symposium on Superconductive Electronics (EASSE), 2015.11. |
| 55. |
Tomoki Ishida, Teruyoshi Sasayama, Masaaki Matsuo, and Keiji Enpuku, Measurement of Iron-plate Thickness Using HTS Coil, ISEC, 2015.07. |
| 56. |
Manabu Morishita, Takashi Miyazaki, Yuya Tsujita, Teruyoshi Sasayama, Keiji Enpuku, Narrowband Magnetic Particle Imaging Using Cooled Pickup Coil and Third Harmonic Detection, ISEC, 2015.07. |
| 57. |
Masakazu Ura, Yuta Ueoka, Kota Nakamura, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, New Detection Method of Biological Targets Based on HTS SQUID and Magnetic Marker, ISEC, 2015.07. |
| 58. |
Kanade Saito, Teruyoshi Sasayama, Masanori Nakano, Measurement of Hysteresis Loop at the Tip of the Teeth of an Inverter-Driven Squirrel-cage Induction Motor, Intermag 2015, 2015.05. |
| 59. |
Takashi Yoshida, Naotaka Tsujimura, Kazuhiro Tanabe, Teruyoshi Sasayama, Keiji Enpuku, Evaluation of Complex Harmonic Signals from Magnetic Nanoparticles for Magnetic Particle Imaging, Intermag 2015, 2015.05. |
| 60. |
Teruyoshi Sasayama, Takashi Yoshida, Kazuhiro Tanabe, Naotaka Tsujimura, Keiji Enpuku, Hysteresis Loss of Fractionated Magnetic Nanoparticles for Hyperthermia Application, Intermag 2015, 2015.05. |
| 61. |
Teruyoshi Sasayama, Yuji Gotoh, Keiji Enpuku, Improving Estimation Accuracy of Nasogastric Tube Tip Position using Pre Data, Intermag 2015, 2015.05. |
| 62. |
Teruyoshi Sasayama, Yusuke Yanamoto, Shunsuke Funaji, Takahiro Ao, Comparison of Experiment and Simulation Results for Inductance and Equivalent Resistance Obtained using Multi-port Transformer Model and FEM, Intermag 2015, 2015.05. |
| 63. |
Shi Bai, Aiki Hirokawa, Kazuhiro Tanabe, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku, Narrowband Magnetic Particle Imaging Utilizing Electric Scanning of Field Free Point, Intermag 2015, 2015.05. |
| 64. |
Teruyoshi Sasayama, Takashi Yoshida, Mohd Mawardi Saari, Keiji Enpuku, Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions, MMM Conference, 2014.11. |
| 65. |
Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, Teruyoshi Sasayama, Takashi Yoshida, Keiji Tsukada, Characterization of magnetic moment distribution in low-concentrated solutions of iron oxide nanoparticles by high-Tc SQUID magnetometer, MMM Conference, 2014.11. |
| 66. |
Teruyoshi Sasayama, Yuji Gotoh, Keiji Enpuku, Application of minimum variance beamformer for estimation of tip position of a nasogastric tube, Intermag 2014, 2014.05. |
| 67. |
Teruyoshi Sasayama, Yusuke Yanamoto, Shunsuke Funaji, Takahiro Ao, A practical method to calculate self- and mutual-inductance and equivalent resistance for a zone-control induction heating system, Intermag 2014, 2014.05. |
| 68. |
Teruyoshi Sasayama, Masataka Morita, Masanori Nakano, Experimental study on effect of load on iron loss of electrical steel sheet under PWM inverter excitation, Intermag 2014, 2014.05. |
| 69. |
Yusuke Yanamoto, Teruyoshi Sasayama, Norio Takahashi, Naoki Uchida, Takahiro Ao, Keiji Kawanaka, Nobuyasu Matsunaka, Examination on Equivalent Resistance and Coupling Coefficient of Zone-Control Induction Heating by Finite Element Method, Compumag 2013, 2013.07. |
| 70. |
Teruyoshi Sasayama, Yusuke Yanamoto, Norio Takahashi, Naoki Uchida, Takahiro Ao, Keiji Kawanaka, Nobuyasu Matsunaka, Proposal of Concept of Theoretical Formula for Equivalent Resistances for Zone-Control Induction Heating System and Theoretical and Numerical Examination, Compumag 2013, 2013.07. |
| 71. |
Shuhei Okamura, Teruyoshi Sasayama, Norio Takahashi, Yoshihiro Yamagami, 3D Optimization of Magnetic Circuit of Linear Oscillatory Actuator of Diaphragm Blower, 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012), 2012.11. |
| 72. |
T. Sasayama, S. Hamada, T. Kobayashi, Application of linearly-constrained prewhitening beamformer to reconstruction of highly correlated EEG signal sources, IEEE/ICME International Conference on Complex Medical Engineering, 2011.05. |
| 73. |
Teruyoshi Sasayama, Tomoaki Iida, Takenori Oida, Shoji Hamada, Tetsuo Kobayashi, Construction of human head voxel models from MR images for EEG analysis based on EM algorithm, IEEE/ICME International Conference on Complex Medical Engineering, 2010.07. |
