| 基于图像配准的CT定位像床板影校正 |
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| 引用本文： | 张力新,安会霞,林旻,邢占峰,曹玉珍.基于图像配准的CT定位像床板影校正[J].天津大学学报(自然科学与工程技术版),2006,39(11):1375-1378. |
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| 作者姓名： | 张力新 安会霞 林旻 邢占峰 曹玉珍 |
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| 作者单位： | [1]天津大学精密仪器与光电子工程学院,天津300072 [2]航卫通用电气医疗系统有限公司,北京100176 |
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| 摘 要： | 针对计算机断层成像中床板非均匀性制约定位像质量给临床扫描带来的问题，提出基于图像配准的数字减影方法．该方法先通过仿射变换将空床板扫描图像投射到与待校正图像相同高度的平面上，再采用单向Sobel算子提取出两幅图像中的床板纵向特征并对齐，最终对经过块匹配精确配准的两幅图像进行数字减影，消除待校正定位像中的床板影．仿真试验证明了该方法的有效性．
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| 关 键 词： | 定位像 仿射变换 图像配准 床板影校正 |
| 文章编号： | 0493-2137（2006）11-1375-04 |
| 收稿时间： | 2005-11-01 |
| 修稿时间： | 2005-11-012006-07-05 |
Cradle Image Correction Method for CT Scout Scan Based on Image Registration |
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| ZHANG Li-xin,AN Hui-xia,LIN Min,XING Zhan-feng,CAO Yu-zhen.Cradle Image Correction Method for CT Scout Scan Based on Image Registration[J].Journal of Tianjin University(Science and Technology),2006,39(11):1375-1378. |
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| Authors: | ZHANG Li-xin AN Hui-xia LIN Min XING Zhan-feng CAO Yu-zhen |
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| Institution: | 1.School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China; 2. GE Hangwei Medical System Co., Ltd. Beijing 100176,China |
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| Abstract: | In scout scan of computer tomography(CT),the limited cradle quality imposes a limit on the clinical CT scan.For this reason,a digital subtraction method based on image registration technology was presented.First,the cradle only image was projected to the plane at the height of object image through affine transformation.Second,the vertical characteristics of cradle in both cradle only and cradle with patient images were extracted by using Sobel operator and then registrated.Finally,the cradle image was subtracted from the cradle with patient images.The results of simulation demonstrate the efficiency of this method. |
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| Keywords: | scout scan affine transformation image registration cradle image correction |
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