由于难以控制的胃肠蠕动、现有影像设备的有限分辨力及技术偏重于其他器官系统,胃肠道的数字影像技术的临床应用已落后于其他系统。胃肠透视的数字化在获得、储存和处理系统的优点是稳定的影像质量、优化的硬件曝光、立即图像显示、可...由于难以控制的胃肠蠕动、现有影像设备的有限分辨力及技术偏重于其他器官系统,胃肠道的数字影像技术的临床应用已落后于其他系统。胃肠透视的数字化在获得、储存和处理系统的优点是稳定的影像质量、优化的硬件曝光、立即图像显示、可与图像分类和联络(picturearchiving and communication,PAC)系统结合、可进行后处理使影像优化、操作方便及费用少。由于计算机辅助的电视透视系统的发展,展开更多
Synthetic aperture radar interferometry (InSAR) has been used as an innovative technique for digital elevation model (DEM) and topographic map generation. In this paper, external DEMs are used for InSAR DEM generation...Synthetic aperture radar interferometry (InSAR) has been used as an innovative technique for digital elevation model (DEM) and topographic map generation. In this paper, external DEMs are used for InSAR DEM generation to reduce the errors in data processing. The DEMs generated from repeat-pass InSAR are compared. For steep slopes and severe changes in topography, phase unwrapping quality can be improved by subtracting the phase calculated from an external DEM. It is affirmative that the absolute height accuracy of the InSAR DEM is improved by using external DEM. The data processing was undertaken without the use of ground control points and other manual operation.展开更多
In photogrammetry and remote sensing, image matching is a basic and crucial process for automatic DEM generation. In this paper we presented a image relaxation matching method based on feature points. This method can ...In photogrammetry and remote sensing, image matching is a basic and crucial process for automatic DEM generation. In this paper we presented a image relaxation matching method based on feature points. This method can be considered as an extention of regular grid point based matching. It avoids the shortcome of grid point based matching. For example, with this method, we can avoid low or even no texture area where errors frequently appear in cross correlaton matching. In the mean while, it makes full use of some mature techniques such as probability relaxation, image pyramid and the like which have already been successfully used in grid point matching process. Application of the technique to DEM generaton in different regions proved that it is more reasonable and reliable.展开更多
文摘由于难以控制的胃肠蠕动、现有影像设备的有限分辨力及技术偏重于其他器官系统,胃肠道的数字影像技术的临床应用已落后于其他系统。胃肠透视的数字化在获得、储存和处理系统的优点是稳定的影像质量、优化的硬件曝光、立即图像显示、可与图像分类和联络(picturearchiving and communication,PAC)系统结合、可进行后处理使影像优化、操作方便及费用少。由于计算机辅助的电视透视系统的发展,
文摘肋骨骨折是常见的胸部损伤，X线检查是肋骨骨折的首选检查手段[1]，从传统的屏-片系统到计算机X线摄影、（com-puted radiography，CR）数字化点片、数字X线摄影（digital radiography，DR）系统及DR的高级应用功能-双能量减影（dual energy subtraction，DES）的临床应用使X线片诊断肋骨骨折的价值迈上了一个新的阶段。尽管检查手段在不断发展，但肋骨骨折漏诊、误诊仍时有发生。外伤性肋骨骨折文献报道很多[2-5]，但对前肋端骨折的报道很少，而此段又是肋骨骨折最易漏诊、误诊的部位。本研究收集本院自2008年8月至2013年4月1126例外伤性肋骨骨折病例，
基金Funded by the Key Tenth five Project of State Bureau of Surveying and Mapping (No. 1469990324236 04 06) and the Faculty Research Grant of Uni versity of New South Wales (No. PS03283).
文摘Synthetic aperture radar interferometry (InSAR) has been used as an innovative technique for digital elevation model (DEM) and topographic map generation. In this paper, external DEMs are used for InSAR DEM generation to reduce the errors in data processing. The DEMs generated from repeat-pass InSAR are compared. For steep slopes and severe changes in topography, phase unwrapping quality can be improved by subtracting the phase calculated from an external DEM. It is affirmative that the absolute height accuracy of the InSAR DEM is improved by using external DEM. The data processing was undertaken without the use of ground control points and other manual operation.
文摘In photogrammetry and remote sensing, image matching is a basic and crucial process for automatic DEM generation. In this paper we presented a image relaxation matching method based on feature points. This method can be considered as an extention of regular grid point based matching. It avoids the shortcome of grid point based matching. For example, with this method, we can avoid low or even no texture area where errors frequently appear in cross correlaton matching. In the mean while, it makes full use of some mature techniques such as probability relaxation, image pyramid and the like which have already been successfully used in grid point matching process. Application of the technique to DEM generaton in different regions proved that it is more reasonable and reliable.
