Ultrasound Inverse Scattering Computed Tomography under the Angular Illumination Limitation
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概要
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Transmission ultrasound inverse scattering computed tomography is expected to be useful for breast cancer screening, because it provides the quantitative sound speed reconstruction of tissue properties. For the realization of the system, however, large-scale ring array acquisition systems are required and hardware cost becomes very high. To resolve this problem, four linear array probes are placed around the rectangular perimeter of the target region. By this means, system may be realized at a lower cost and may still be compatible with conventional B mode imaging. In this system, a limitation on the illumination angle is imposed based on the range achievable with electronic scanning by the four linear arrays. Hence, ill-posedness caused by the lack of angular view information becomes a serious problem. As a resolution to this problem, a hybrid method using both angular and frequency diversity observations is employed, so that low-frequency scattering signal components are incorporated into the image reconstruction calculations. To examine the method numerically, scattered data are synthesized for tissue-like rectangular test objects through rigorous calculations using the finite difference method. From the results of the reconstructed images, it is demonstrated that the precision of the sound speed and reproducibility of the object shape is almost satisfactory, even when the illumination view is limited over an extremely narrow range.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-08-15
著者
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YAMADA Akira
Graduate School of Bio-Applications & Systems Engineering, Tokyo University of Agriculture and Techn
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Yano Satoshi
Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
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