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Fundamental Research on Acoustic Diagnosis of Intracranial Aneurysms

Research Project

Project/Area Number 60440068
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Cerebral neurosurgery
Research InstitutionTokyo Institute of Technology

Principal Investigator

IKEBE Jun  Tokyo Institute of Technology, Professor, 精密工学研究所, 教授 (70016749)

Co-Investigator(Kenkyū-buntansha) KOSUGI Yukio  Tokyo Institute of Technology, Associate Professor, 大学院総合理工学研究科, 助教授 (30108237)
TAKAKURA Kintomo  University of Tokyo, Professor, 医学部, 教授 (90109984)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥10,000,000 (Direct Cost: ¥10,000,000)
KeywordsAneurysm / AVM / Blood-flow / Turbulence / Sound / Acoustic-Diagnosis
Research Abstract

Intracranial aneurysm and arteriovenous malformation (AVM) are potentially dangerous diseases because they often cause fatal hemorrhage without any warning signs or symptoms. In the normal cerebrovascular system, the blood flow is laminar and no sound is audible, whereas in the abnormal arteries, turbulent flow sometimes generate an acoustically detectable noise; this sound is called a cranial bruit.
In this research, methods of detecting the cranial bruit are investigated. For successful detection of the sound, sensitive detectors must be applied close to the head since the sound is very weak, and, as in cerebrovascular diseases, the sound source is usually concealed deep inside the hard shelter of the skull. For this purpose , we designed new detectors that are acoustically matched to the head by making measurements of the mechanical impedance of the heads of normal subjects. The detection system used had a gain of 40 to 50 dB greater than that of an ordinary stethoscope. In our experiments on the patients suffering from intracranial aneurysm and AVM , the sound usually started about 160 msec after the ventricular contraction and lasted for 100 to 400 msec. Its frequency component mostly ranged from 200 Hz to 2 kHz, but the spectrum profile changed according to the detector position and the degree of abnormality. These results showed the possibility of noninvasive diagnosis of intracranial vascular lesions, especially for detecting aneurysms in health care examinations.

Report

(2 results)
  • 1986 Final Research Report Summary
  • 1985 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Yukio Kosugi: IEEE Transactions on Biomedical Engineering. 34-3. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yukio Kosugi: Progress in Acoustic Emission. 3. 236-243 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 高倉公朋: Clinical Neuroscience. 3-8. 866-867 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 小杉幸夫: 日本非破壊検査協会特別研究委員会資料. 006-96. 1-7 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yukio Kosugi: "Detection and Analysis of Cranial Bruit" IEEE Trans. on Biomedical Engineering. 34-3. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yukio Kosugi: "Acoustic Diagnosis of Vascular Disease of The Brain" Progress in Acoustic Emission. <III> . 236-243 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kintomo Takakura: "Method to predict the subarachnoid hemorrhage" Clinical Neuroscience. 3-8. 866-867 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yukio Kosugi: "Measurement of Cranial Bruit and the The diagnosis of the Vascular Disease of the Brain" Acoustic Emission (Tokyo). 78. 1-7 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 電子通信学会全国大会予稿集. #2720. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] Clinical Neurocience. 3-8. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 日本非破壊検査協会特別研究委員会資料. 006-96. (1986)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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