Magnetic nanoparticle imaging using cooled pickup coil and harmonic signal detection

Keiji Enpuku, Takafumi Morishige, Takuro Mihaya, Takashi Miyazai, Masaaki Matsuo, Seki Haku, Takashi Yoshida

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)


We developed a highly sensitive measurement system using a Cu pickup coil cooled at 77 K for magnetic nanoparticle imaging. The magnetic field noise of the system was as low as 90 fT/Hz1/2 at the resonant frequency of 3 kHz when the pickup coil was connected to a resonant capacitor. We also characterized the magnetic properties of the nanoparticles for use in magnetic nanoparticle imaging. We demonstrated the detection of nanoparticles using the third-harmonic signal generated by the nonlinear magnetization of nanoparticles. An excitation field having a frequency of 1 kHz and amplitude of 1.6mT was applied to the magnetic particles, and the third harmonic signal at 3 kHz was detected. By separating the signal frequency from that of the excitation field, we could avoid the interference of the excitation field and were able to obtain a clear contour map of the signal field. We could detect 100 μg of magnetic nanoparticles located as far as 100mm under the pickup coil.

ジャーナルJapanese journal of applied physics
出版ステータス出版済み - 8 2013

All Science Journal Classification (ASJC) codes

  • 工学(全般)
  • 物理学および天文学(全般)


「Magnetic nanoparticle imaging using cooled pickup coil and harmonic signal detection」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。