| Project/Area Number |
24500561
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Medical systems
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| Research Institution | Doshisha University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
AKIYAMA Iwaki 同志社大学, 生命医科学部, 教授 (80192912)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | 血流速度ベクトル計測 / マイクロバブル / 非線形振動 / 超音波エコー方式 / 流路ファントム / 超音波造影剤 / 和音成分 / 超音波ビーム交差方式 / 和音生成 / 血流速度ベクトル / 造影超音波 / ２ビーム交差方式 / 和音 / 音響放射力 / 粘性 / 音圧 / グリセリン水溶液 / 和音・差音成分 / 2周波数送波 / 血流模擬ファントム / 音圧依存性 |
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| Outline of Final Research Achievements |
Since the Doppler frequency of summed and different frequency observed by the ultrasonic crossed beams contrast echo method is calculated as a function of two angle components for the beams to the flow direction, a blood flow vector is estimated by solving the simultaneous equations of second harmonic and summed components without beam angle. This study discusses the feasibility of the proposed method by using experimental system incudes flow phantom. This experimental system is constructed as follows. The silicone tube of 4mm of inner diameter is located in the degassed water tank. The two ultrasonic beams of frequency of 3.2MHz and 2.0 MHz are crossed at the tube. Microbubbles (Sonazoid) are flowed in the tube with degassed water. Flow velocities are set as 10 mm/s, 20 mm/s and 30 mm/s. The summed frequency is 5.2MHz and second harmonic is 6.4 MHz. As a result, the flow velocities are estimated within the error ratio of 10%.
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