| Project/Area Number |
08671062
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | Kurume University School of Medicine |
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Principal Investigator |
ONIZUKA Yoshihiko Kurume University School of Medicine, Assistant professor, 医学部, 助教授 (30160899)
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| Co-Investigator(Kenkyū-buntansha) |
HAYABUCHI Naofumi Kurume University School of Medicine, Assistant professor, 医学部, 教授 (20108731)
INUTUKA Hiroki Kurume University School of Medicine, Assistant professor, コンピュータ教育センター, 助教授 (70248350)
JOH Seiya Kurume University School of Medicine, Assistant professor, 医学部, 助手 (30196662)
SATO Hitoshi Kurume University School of Medicine, Assistant professor, 助手 (90285057)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Hyperthermia / Radiofrequency / Electric field / Magnetic field / Treatment planning / SAR distribution / treatment plannning / SAR distrilution / 温熱療法 / RF波 / 電磁界強度 / サーモトロン / ダイオード |
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| Research Abstract |
Radio frequency hyperthermia device Thermotron 8 (RF-8) is popular for deep hyperthermia treatments in Japan. However, their physical characteristics are not available. For this purpose, we measured the electric field strength in a water phantom with specially designed probes with a diode and high-resistivity leads. These probes consist of a diode(ISS-1) and high resistance leads (FULOTRON, DAIKIN Co.Ltd.). Measurements were possible by using a combination ofa dipole antenna and a diode rectifier for an electric field strength. Also, for measurement of magnetic field strength, a combination of a loop antenna and a diode rectifier was used. The probes were inserted and scanned in a phantom filled with saline (0.3% MaC1) which was irradiated by RF-8 operating at a frequency of 8MHz. The probes were calibrated with Broadband Isotropic Field Meter (Holaday Industries Inc.). Our simple field probes with high-resistance leads werea ble to measure the field strength. Onthe central axis of twoel ectrodes (14cm diameter), the fields trength of E-field decreased to 86.8% and the strength of M-field decreased to 51.1% at the distance of 9 cm from thece nter of two electrodes. The asymmetric power distribution was observed at the vertical line on the mid plane between two electrodes. We concluded that the distortions of the field in our results are to the groung connection of one electrode side.
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