| Presentation | 2012-02-23 High speed synthetic aperture beamforming on arbitrary orthogonal coordinate system Chikayoshi SUMI, Naoto Yamazaki, Yousuke Ishii, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Almost conventional medical ultrasound imaging equipments perform transmission and reception beamforming and electric scanning using array-type transducers with various aperture geometries such as a linear type, a convex type etc. For secta scanning, arc scanning, and radial scanning, a mechanical scan is also performed. We also reported new beamforming methods such as a lateral modulation (LM) using crossed, steered beams and ASTA (a defined steering angle) with post signal processing for yielding a LM. Using such methods, we succeeded in permitting LM imaging with a lateral modulation frequency and displacement vector measurement using the multidimensional autocorrelation method (MAM) and multidimensional Doppler method (MDM). For a high speed scanning, we also use plane wave transmission. Such a scanning is effective in yielding an axial strain measurement, particularly when using a 2-dimensional array aperture transducer. Generally, all the imaging and measurement are performed on orthogonal coordinate systems, which are determined by the used aperture geometry, beamforming method and scanning method. When an arbitrary curvilinear orthogonal coordinate system is used, for imaging echo data and measurement data using a display, the data of respective pixels or voxels expressed by a Cartesian coordinate system are interpolated. After converting the data, the measurement can also be performed. In this report, it is confirmed that for an arbitrary scanning method, the echo data of an arbitrary position can be immediately generated through synthetic aperture processing using Fourier's transforms. Then, we propose that the method is used for the imaging and measurement only using a Cartesian coordinate system. In simulations shown, the rotation of the coordinate system is performed on a case where the transmission of a plane wave is performed. The method approach can also be used for an arbitrary directional beamforming and an arbitrary field of vision (FOV) regardless the geometry of the aperture used. The approach does not require any interpolation processing for generating echo data, and thus it is possible to permit high speed measurement and imaging with a high accuracy. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Arbitrary coordinate system / high speed / echo imaging / displacement vector measurement / arbitrary beamforming |
| Paper # | US2011-110 |
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| Committee | US |
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| Conference Date | 2012/2/16(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | High speed synthetic aperture beamforming on arbitrary orthogonal coordinate system |
| Sub Title (in English) | |
| Keyword(1) | Arbitrary coordinate system |
| Keyword(2) | high speed |
| Keyword(3) | echo imaging |
| Keyword(4) | displacement vector measurement |
| Keyword(5) | arbitrary beamforming |
| 1st Author's Name | Chikayoshi SUMI |
| 1st Author's Affiliation | Dept of Info and Commun Sci, Faculty of Sci and Tech, Sophia University() |
| 2nd Author's Name | Naoto Yamazaki |
| 2nd Author's Affiliation | Dept of Info and Commun Sci, Faculty of Sci and Tech, Sophia University |
| 3rd Author's Name | Yousuke Ishii |
| 3rd Author's Affiliation | Dept of Info and Commun Sci, Faculty of Sci and Tech, Sophia University |
| Date | 2012-02-23 |
| Paper # | US2011-110 |
| Volume (vol) | vol.111 |
| Number (no) | 443 |
| Page | pp.pp.- |
| #Pages | 4 |
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