Rotary scanning wireless temperature measurement method for hyperthermia using ferromagnetic implants

Loi Tonthat, Hajime Saito, Ryuhei Miyamoto, Masafumi Suzuki, Noboru Yoshimura, Kazutaka Mitobe

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Recently, the use of a ferromagnetic material in a soft-heating method has garnered much attention as a novel method for cancer treatment. By concurrently using this material as a thermal probe, we are currently developing a minimally invasive heating and wireless temperature measurement system. To make the approach feasible in a clinical setting, it is vital to overcome the key challenge of heating the local tumor at a constant temperature. In previous conventional approaches, it was necessary to switch the induction-heating power supply on/off after the target tumor temperature was reached. However, it cannot determine the temperature of the material during the power-off period. Therefore, we changed this approach and found that by adjusting the distance between the heating coil and the material while maintaining a constant current flow in heating coil, the drift problem, which happened just after power is supplied during the on/off operation, did not occur any longer. Accordingly, it was not required to use multiple sensors to reduce the drift, thereby minimizing the cost. This study verifies the validity of our wireless thermometry approach while performing rotary scanning and proposes a technique for determining achievement of the target temperature. This knowledge complements other approaches for cancer treatment utilizing hyperthermia.

Original languageEnglish
Pages (from-to)S1-S6
JournalIEEJ Transactions on Electrical and Electronic Engineering
Publication statusPublished - 2015 Oct


  • Ferromagnetic implants
  • Hyperthermia
  • Rotary scanning
  • Soft heating
  • Wireless temperature measurement


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