3 0 0 0 OA 超音波の安全性
- 著者
- 古幡 博
- 出版者
- The Japan Academy of Neurosonology
- 雑誌
- Neurosonology:神経超音波医学 (ISSN:0917074X)
- 巻号頁・発行日
- vol.12, no.1, pp.31-35, 1999-02-28 (Released:2010-10-14)
- 参考文献数
- 5
- 被引用文献数
- 2 1
From the viewpoint of safety, it is necessary for the diagnostic ultrasonic equipment used in clinical practice to satisfy the FDA 510 (k) requirement track III. The new requirement requires medical doctors and staff to have a greater understanding of ultrasonic bioeffects as indicated by the mechanical index (MI) and the thermal index (TI), on the real-time display of recently developed diagnostic ultrasonic devices.This article describes the significance of MI and TI and the variables in clinical use. Also it is noted that the ultrasonic examiner should uphold the principle of ALARA (as low as reasonably achievable) in clinical use.
2 0 0 0 OA 経頭蓋超音波脳血栓溶解療法
- 著者
- 古幡 博
- 出版者
- 公益社団法人 日本生体医工学会
- 雑誌
- 生体医工学 (ISSN:1347443X)
- 巻号頁・発行日
- vol.43, no.2, pp.197-202, 2005 (Released:2007-01-19)
- 参考文献数
- 11
1 0 0 0 東京タワー近傍医療機関における外来電磁界強度の測定
- 著者
- 中川 清隆 松山 寛子 原田 元 二神 成一 谷藤 泰正 天木 嘉清 古幡 博
- 出版者
- 日本医療機器学会
- 雑誌
- 医科器械学 (ISSN:0385440X)
- 巻号頁・発行日
- vol.76, no.3, pp.83-89, 2006-03-01
- 参考文献数
- 12
The Jikei University Hospital is located about 600m from the Tokyo Tower in the central area of Tokyo. This means that the patients and staff members of the hospital may be exposed to strong electromagnetic field intensities (EMFI) radiated from the tower antenna and to various telecommunication EMFI that exist in a large city like Tokyo. EMFI was measured at eight points of the hospital buildings facing the tower. Two types of antenna were used to cover the frequency range from 30MHz to 1.5GHz. EMFI was calculated from every peak value in the frequency spectrum recorded logarithmically. Every peak intensity was less then 2μW/cm at the maximum of the whole spectrum, which is a much lower value than the standard value specified by the Japanese 'Radio Radiation Protection Guidelines For the Human Body in Electromagnetic Fields'. Additionally the total value of the whole spectrum was less than 6μW/cm at all eight points. It is concluded from these actual results of measurement that our hospital does not need to perform any urgent safety measures to protect patients and staff members from the various electromagnetic environments, including strong broadcasting waves from Tokyo Tower.