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Blood Flow Imaging Technique for Intravascular Ultrasound

Research Project

Project/Area Number 08680920
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Biomedical engineering/Biological material science
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

KUDO Nobuki  Hokkaido Univ.Grad.School of Eng.Instructor, 大学院・工学研究科, 助手 (30271638)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Makoto  Hokkaido Univ.Grad.School of Eng.Assistant Professor, 大学院・工学研究科, 助教授 (10154858)
YAMAMOTO Katsuyuki  Hokkaido Univ.Grad.School of Eng.Professor, 大学院・工学研究科, 教授 (10088867)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsMedical ultrasound / Intravascular Ultrasound / Blood flow measurement / Correlation / RF signal / Atheroma / Vascular lumen
Research Abstract

1.RF echo processing
We developed a new time domain correlation technique for detecting displacement and velocity vectors. The technique is based on calculation of the correlation between RF echo detected by a single transducer at a fixed repetition rate. Relation between the velocity vector and correlation was derived theoretically. Advanced RF signal processing techniques for evaluation of structure and charactor of biological tissue were also discussed.
2.Measurement system
>>Transducers for IVUS
Small transducers (1.2mm * 0.8mm) which can be used in the IVUS catheter were developed. Improvement of spatial resolution and speckle reduction in the B-mode image were discussed.
>>Data acquisition and processing system
RF echo signal of the 16 sequential radial scan images is digitized into a 4 Mbyte digital data and a correlation image is processed in several minutes using personal computer. A blood flow phantom was also diveloped for in vitro experiments.
3.Experimental evaluation
>>Measurement of flow velocity (1-D distribution)
In vitro experiments to measure the one-dimensional distribution of the flow velocity in the flow phantom were carried out. The experimental results demonstrated the practicability of the flow velocity measurement in the IVUS using the correlation technique.
>>Detection of vascular lumen (2-D imaging)
Extension of the correlation technique to the radial scan image was discussed. In this case, it is difficult to measure the flow velocity using correlation technique. However, still it is possible to get the information whether it flows or not. In vitro experiment showed that the vascular lumen was clearly identified in the radial scan image using the correlation technique.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 山本 克之: "動脈硬化の定量的評価を目指した超音波計測" 東北大学電気通信研究所シンポジウム論文集. 36. 151-161 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nobuki, KUDO: "Uitrosound Attenuation Mesurement of Tissuein Frequency Range 2.5-40MHz Using a Multi-resonance Transducer" 1997 IEEE Ultrasonics Symposium Proceedings. 1181-1184 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 工藤 信樹: "超音波RFエコー解析による頸動脈壁厚計測に関する検討" 超音波医学. 25・3(印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 張 旭: "相関法を用いた単一集束超音波ビームによる変位・流速ベクトルの計測特性の理論解析" 超音波医学. 25・3(印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyuki YAMAMOTO et al.: "Ultrasonic measurement for quantitative evaluation of arteriosclerosis" Proceedings of Electrical Communication Lab.Symposium of Tohoku University. 36. 151-161 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nobuki KUDO et al.: "Ultrasound Attenuation Measurement of Tissue in Frequency Range 2.5-40 MHz Using a Multi-Resonance Transducer" 1997 IEEE Ultrasonics Symposium Proceedings. 1181-1184 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nobuki KUDO et al.: "Measurement of the Wall Thikness of the Carotid Artery Using Ultrasound Radiofrequency Echo Signals" Jpn J.Med.Ultrasonics. 25-3 (in print). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Xu ZHANG et al.: "Theoretical Analysis on Measurement of Displacement and Velocity Vectors with a Single Focused Ultrasound Beam Using a Time-Domain Correlation Technique" Jpn J.Med.Ultrasonics. 25-3 (in print). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 山本 克之: "動脈硬化の定量評価を目指した超音波計測" 東北大学電気通信研究所シンポジウム論文集. 36. 151-161 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nobuki KUDO: "Ultrasound Attenuation Measurement,of Tissue in Frequency Range 2.5-40MHz Using a Multi-resonance Transducer" Ultrasonic Symposium,1997 IEEE International. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 工藤 信樹: "超音波RFエコー解析による頸動脈壁厚計測に関する検討" 超音波医学. 25・3(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 張 旭: "相関法を用いた単一集束超音波ビームによる変位・流速ベクトルの計測特性の理論解析" 超音波医学. 25・3(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 山本克之: "動脈硬化の定量評価を目指した超音波計測" 東北大学電気通信研究所シンポジウム論文集. 36巻. 151-161 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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