• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>NDT & E international >Measurement of micron level distortions in a macroscopic cylindrical object from x-ray CT images
【24h】

Measurement of micron level distortions in a macroscopic cylindrical object from x-ray CT images

机译：从X射线CT图像测量宏观圆柱形物体中的微米级畸变

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A technique for the measurement or tracking of fine distortion in macroscopic objects of nominally circular section is described and assessed. Distortions of order several microns have been measured in a 14 cm diameter, thick-walled polymethyl methacrylate (PMMA or Perspex) cylinder by tracking the location of multiple edge points of the object in its x-ray CT images using the circle-PLUS subpixel edge detection procedure. The cylinder was deformed by compressing it along a diameter over a total range of 340 μm (0.7 pixel in its CT image) in 10 steps. The successive cylinder wall deflections in the direction of the compression, and the corresponding deflections in the perpendicular direction, were calculated from images obtained using a GE Lightspeed medical CT scanner. The calculated shifts in cylinder diameter were compared directly with mechanical measurements obtained with a micrometer. The minimum detectable shift in object diameter of 0.033 pixel or l/30th of a pixel (16μm) was calculated from the image and verified by mechanical measurement. The circle-PLUS edge detection procedure should be applicable to both precision industrial measurements and clinical measurements such as vessel or bone dimensions or applications requiring precise organ size, shape or position determination. The procedure is not restricted to x-ray CT applications and could also be readily applied to precision optical measurements or MRI data.
机译：描述和评估了一种用于测量或跟踪名义上圆形截面的宏观物体中的精细变形的技术。通过使用circle-plus子像素边缘跟踪对象在其x射线CT图像中多个边缘点的位置，已在直径为14 cm的厚壁聚甲基丙烯酸甲酯（PMMA或有机玻璃）圆柱中测量了几微米的失真检测程序。通过沿10个步骤在340μm的总范围（其CT图像中的0.7像素）的直径上压缩圆柱，使圆柱变形。由使用GE Lightspeed医用CT扫描仪获得的图像计算出压缩方向上连续的气缸壁偏斜以及垂直方向上的相应偏斜。将计算出的圆柱直径偏移直接与用千分尺获得的机械测量值进行比较。从图像计算出物体直径的最小可检测偏移为0.033像素或像素的1/30（16μm），并通过机械测量进行了验证。 circle-PLUS边缘检测程序应适用于精密的工业测量和临床测量，例如血管或骨骼的尺寸或需要精确的器官大小，形状或位置确定的应用。该程序不仅限于X射线CT应用，还可以很容易地应用于精密光学测量或MRI数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号