Real-time temperature control system based on the finite element method for liver radiofrequency ablation

Effect of the time interval on control

Yosuke Isobe, Hiroki Watanabe, Nozomu Yamazaki, Xiaowei Lu, Yo Kobayashi, Tomoyuki Miyashita, Makoto Hashizume, Masakatsu G. Fujie

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    Radiofrequency (RF) ablation is increasingly being used to treat liver cancer because it is minimally invasive. However, it is difficult for operators to control the size of the coagulation zones precisely, because no method has been established to form an adequate and suitable ablation area. To overcome this limitation, we propose a new system that can control the coagulation zone size. The system operates as follows: 1) the liver temperature is estimated using a temperature-distribution simulator to reduce invasiveness; 2) the output power of the RF generator is controlled automatically according to the liver temperature. To use this system in real time, both the time taken to calculate the temperature in the simulation and the control accuracy are important. We therefore investigated the relationship between the time interval required to change the output voltage and temperature control stability in RF ablation. The results revealed that the proposed method can control the temperature at a point away from the electrode needle to obtain the desired ablation size. It was also shown to be necessary to reduce the time interval when small tumors are cauterized to avoid excessive treatment. In contrast, such high frequency feedback control is not required when large tumors are cauterized.

    Original languageEnglish
    Title of host publicationProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
    Pages392-396
    Number of pages5
    DOIs
    Publication statusPublished - 2013
    Event2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013 - Osaka, Japan
    Duration: 2013 Jul 32013 Jul 7

    Other

    Other2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013
    CountryJapan
    CityOsaka
    Period13/7/313/7/7

    Fingerprint

    Real time control
    Ablation
    Temperature control
    Liver
    Control systems
    Finite element method
    Temperature
    Coagulation
    Tumors
    Needles
    Voltage control
    Feedback control
    Temperature distribution
    Simulators
    Computer Systems
    Liver Neoplasms
    Electrodes
    Neoplasms

    ASJC Scopus subject areas

    • Computer Vision and Pattern Recognition
    • Signal Processing
    • Biomedical Engineering
    • Health Informatics

    Cite this

    Isobe, Y., Watanabe, H., Yamazaki, N., Lu, X., Kobayashi, Y., Miyashita, T., ... Fujie, M. G. (2013). Real-time temperature control system based on the finite element method for liver radiofrequency ablation: Effect of the time interval on control. In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS (pp. 392-396). [6609519] https://doi.org/10.1109/EMBC.2013.6609519

    Real-time temperature control system based on the finite element method for liver radiofrequency ablation : Effect of the time interval on control. / Isobe, Yosuke; Watanabe, Hiroki; Yamazaki, Nozomu; Lu, Xiaowei; Kobayashi, Yo; Miyashita, Tomoyuki; Hashizume, Makoto; Fujie, Masakatsu G.

    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS. 2013. p. 392-396 6609519.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Isobe, Y, Watanabe, H, Yamazaki, N, Lu, X, Kobayashi, Y, Miyashita, T, Hashizume, M & Fujie, MG 2013, Real-time temperature control system based on the finite element method for liver radiofrequency ablation: Effect of the time interval on control. in Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS., 6609519, pp. 392-396, 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013, Osaka, Japan, 13/7/3. https://doi.org/10.1109/EMBC.2013.6609519
    Isobe Y, Watanabe H, Yamazaki N, Lu X, Kobayashi Y, Miyashita T et al. Real-time temperature control system based on the finite element method for liver radiofrequency ablation: Effect of the time interval on control. In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS. 2013. p. 392-396. 6609519 https://doi.org/10.1109/EMBC.2013.6609519
    Isobe, Yosuke ; Watanabe, Hiroki ; Yamazaki, Nozomu ; Lu, Xiaowei ; Kobayashi, Yo ; Miyashita, Tomoyuki ; Hashizume, Makoto ; Fujie, Masakatsu G. / Real-time temperature control system based on the finite element method for liver radiofrequency ablation : Effect of the time interval on control. Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS. 2013. pp. 392-396
    @inproceedings{06908b8b34584143b7615463eb57ffe3,
    title = "Real-time temperature control system based on the finite element method for liver radiofrequency ablation: Effect of the time interval on control",
    abstract = "Radiofrequency (RF) ablation is increasingly being used to treat liver cancer because it is minimally invasive. However, it is difficult for operators to control the size of the coagulation zones precisely, because no method has been established to form an adequate and suitable ablation area. To overcome this limitation, we propose a new system that can control the coagulation zone size. The system operates as follows: 1) the liver temperature is estimated using a temperature-distribution simulator to reduce invasiveness; 2) the output power of the RF generator is controlled automatically according to the liver temperature. To use this system in real time, both the time taken to calculate the temperature in the simulation and the control accuracy are important. We therefore investigated the relationship between the time interval required to change the output voltage and temperature control stability in RF ablation. The results revealed that the proposed method can control the temperature at a point away from the electrode needle to obtain the desired ablation size. It was also shown to be necessary to reduce the time interval when small tumors are cauterized to avoid excessive treatment. In contrast, such high frequency feedback control is not required when large tumors are cauterized.",
    author = "Yosuke Isobe and Hiroki Watanabe and Nozomu Yamazaki and Xiaowei Lu and Yo Kobayashi and Tomoyuki Miyashita and Makoto Hashizume and Fujie, {Masakatsu G.}",
    year = "2013",
    doi = "10.1109/EMBC.2013.6609519",
    language = "English",
    isbn = "9781457702167",
    pages = "392--396",
    booktitle = "Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS",

    }

    TY - GEN

    T1 - Real-time temperature control system based on the finite element method for liver radiofrequency ablation

    T2 - Effect of the time interval on control

    AU - Isobe, Yosuke

    AU - Watanabe, Hiroki

    AU - Yamazaki, Nozomu

    AU - Lu, Xiaowei

    AU - Kobayashi, Yo

    AU - Miyashita, Tomoyuki

    AU - Hashizume, Makoto

    AU - Fujie, Masakatsu G.

    PY - 2013

    Y1 - 2013

    N2 - Radiofrequency (RF) ablation is increasingly being used to treat liver cancer because it is minimally invasive. However, it is difficult for operators to control the size of the coagulation zones precisely, because no method has been established to form an adequate and suitable ablation area. To overcome this limitation, we propose a new system that can control the coagulation zone size. The system operates as follows: 1) the liver temperature is estimated using a temperature-distribution simulator to reduce invasiveness; 2) the output power of the RF generator is controlled automatically according to the liver temperature. To use this system in real time, both the time taken to calculate the temperature in the simulation and the control accuracy are important. We therefore investigated the relationship between the time interval required to change the output voltage and temperature control stability in RF ablation. The results revealed that the proposed method can control the temperature at a point away from the electrode needle to obtain the desired ablation size. It was also shown to be necessary to reduce the time interval when small tumors are cauterized to avoid excessive treatment. In contrast, such high frequency feedback control is not required when large tumors are cauterized.

    AB - Radiofrequency (RF) ablation is increasingly being used to treat liver cancer because it is minimally invasive. However, it is difficult for operators to control the size of the coagulation zones precisely, because no method has been established to form an adequate and suitable ablation area. To overcome this limitation, we propose a new system that can control the coagulation zone size. The system operates as follows: 1) the liver temperature is estimated using a temperature-distribution simulator to reduce invasiveness; 2) the output power of the RF generator is controlled automatically according to the liver temperature. To use this system in real time, both the time taken to calculate the temperature in the simulation and the control accuracy are important. We therefore investigated the relationship between the time interval required to change the output voltage and temperature control stability in RF ablation. The results revealed that the proposed method can control the temperature at a point away from the electrode needle to obtain the desired ablation size. It was also shown to be necessary to reduce the time interval when small tumors are cauterized to avoid excessive treatment. In contrast, such high frequency feedback control is not required when large tumors are cauterized.

    UR - http://www.scopus.com/inward/record.url?scp=84886528335&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84886528335&partnerID=8YFLogxK

    U2 - 10.1109/EMBC.2013.6609519

    DO - 10.1109/EMBC.2013.6609519

    M3 - Conference contribution

    SN - 9781457702167

    SP - 392

    EP - 396

    BT - Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS

    ER -