Effects of electrode types and output powers of microwave ablation on temperature increases: Consecutive monitoring by MR temperature mapping

• Morikawa Shigehiro

  Molecular Neuroscience Research Center, Shiga University of Medical Science

• Inubushi Toshiro

  Molecular Neuroscience Research Center, Shiga University of Medical Science

• Kurumi Yoshimasa

  Department of Surgery, Shiga University of Medical Science

• Naka Shigeyuki

  Department of Surgery, Shiga University of Medical Science

• Tani Tohru

  Department of Surgery, Shiga University of Medical Science

• Tezuka Kei

  Azwell, LTD

• Wakikaido Koichi

  Azwell, LTD

• Haque Hasnine A

  GE-Yokogawa, Medical Systems

Bibliographic Information

Other Title

• マイクロ波出力と針状電極の形状による加温領域への影響―MR温度画像を用いた連続的モニタリング―

Abstract

Temperature changes in both an agar phantom and beef liver during microwave ablation for 10 minutes were consecutively monitored by MR temperature mapping using the proton resonance frequency method. Three kinds of MR-compatible needle-type electrodes (A : normal type with 2 mm gap, B : high output type with 6 mm gap, C : ball-tip type with 2 mm gap) and 2 output powers (80W and 110W) were used. Maximum temperature increases were obtained with electrode A at 110W in an agar phantom, but with electrode B at 110W in beef liver. This difference might have been caused by the condition of the water molecules around the electrode. The area with a temperature increase of more than 30°C showed good correspondence with the coagulated liver. This technique, which did not require cutting the sample and could continuously detect the temperature increase in the same sample, should be useful for the evaluation of electrodes and for the optimization of output power and duration in microwave ablation.

Journal

• Journal of Microwave Surgery

  Journal of Microwave Surgery 20 27-33, 2002

  Study Group of Microwave Surgery

Keywords

• microwave ablation
• MR temperature monitoring
• electrode

Details

• CRID: 1390282680157034496
• NII Article ID: 130000066745
• DOI: 10.3380/jmicrowavesurg.20.27
• ISSN: 1882210X
• ISSN: 09177728
• Web Site: https://search.jamas.or.jp/link/ui/2003083606
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed