マイクロコンピュータを用いた超音波ホログラフィシステムにおける再生像の特性

概要

論文の詳細を見る
The accoustical pulse echo method or the accoustical tomography method are widely used to measure the inside of the human body three-dimensionally. But the resolution of the obtained image is not sufficiently well because the ultrasonic wave is extended by the diffraction of the object. On the contrary, the accoustical holography detects the amplitude and the phase of the wavefront extended by the diffraction and obtains the reconstructed image with the back propagation method numerically. So the resolution of the image will be improved. On that reason, we constructed the experimental system of the acoustical holography using the microcomputer and considered the characteristics of the reconstructed imge. From the experimental results, we could make clear that the acoustical holography was effective to improve the range resolution and the depth resolution of the image of the three-dimensional object. Besides we could improve the depth resolution of the acoustical holography using the burst acoustical wave instead of the sequential accoustical wave. These results are available when the accoustical holography is applied to the actual problems for instance the medical problems.
湘南工科大学の論文
1981-09-30