| Project/Area Number |
25630165
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Measurement engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 超音波 / 角度依存性 / ビーム形成 / 拡散ビーム / 変位ベクトル / 拡散波 / ビームフォーミング |
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| Outline of Final Research Achievements |
Spatial resolution in diagnostic ultrasound imaging is a very important factor determining the accuracy of medical diagnosis. In conventional ultrasound imaging, spatial resolution is improved by using focused beams both in transmit and receive. However, in such a conventional method, an ultrasound beam is created only in one direction in general. Due to the strong angular dependence of ultrasonic reflection, it is difficult to image an object with a curved surface, such as an arterial wall, because the ultrasound beam is perpendicular to the surface of the object in a very limited region. In the present study, a very effective method was developed to reduce the angular dependence of ultrasonic imaging by creating multiple focused receiving beams in different directions using spherically diverging transmit beams produced by transmitting apertures with multiple transducer elements. Multiple transducer elements realize sufficient sound pressure even in the use of a diverging beam.
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