| Presentation | 2008-02-26 Imaging of Displacement Distribution Inside Object Generated by Dual Acoustic Radiation Force Yoshitaka ODAGIRI, Hideyuki HASEGAWA, Hiroshi KANAI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Many studies have been conducted to measure mechanical properties of tissues by applying an ultra-sound-induced acoustic radiation force. To assess mechanical properties, strain of an object must be generated. However, one radiation force is not effective because it also generates translational motion when the object is much harder than surrounding medium. In this study, two cyclic radiation forces are applied to a muscle phantom from two opposite horizontal directions so that the object is cyclically compressed in the horizontal direction. By the horizontal compression, the object is vertically expanded due to the incompressibility. The resultant vertical displacement is measured using ultrasound. Two ultrasonic transducers for actuation were both driven by sums of two continuous sinusoidal signals at two slightly different frequencies (1MHz and (1M+5) Hz). The displacement of several micrometers in amplitude, which fluctuated at 5Hz, were measured by the ultrasonic phased tracking method. Upward displacements at the surface were found when acoustic radiation forces increased. Such displacements correspond vertical expansion due to the horizontal compression. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | acoustic radiation force / strain / ultrasonic phased tracking method / acupuncture therapy |
| Paper # | US2007-114 |
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| Committee | US |
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| Conference Date | 2008/2/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Imaging of Displacement Distribution Inside Object Generated by Dual Acoustic Radiation Force |
| Sub Title (in English) | |
| Keyword(1) | acoustic radiation force |
| Keyword(2) | strain |
| Keyword(3) | ultrasonic phased tracking method |
| Keyword(4) | acupuncture therapy |
| 1st Author's Name | Yoshitaka ODAGIRI |
| 1st Author's Affiliation | Graduate School of Engineering, Tohoku University() |
| 2nd Author's Name | Hideyuki HASEGAWA |
| 2nd Author's Affiliation | Graduate School of Engineering, Tohoku University |
| 3rd Author's Name | Hiroshi KANAI |
| 3rd Author's Affiliation | Graduate School of Engineering, Tohoku University |
| Date | 2008-02-26 |
| Paper # | US2007-114 |
| Volume (vol) | vol.107 |
| Number (no) | 494 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |