摘要
计算机 X线摄影 (Computed Radiography,CR)是近年来国际上较热门的研究课题之一。较之使用普通 X光胶片的常规χ线摄影 ,它的基本原理是采用专用信息数字化载体 ,即影像板 IP(ImagingPlate) ,来完成影像数据的提取及数字化 ,并借助计算机进行影像数据处理和影像重建工作。在 X线影像信号的提取过程中 ,由于受到各种随机干扰噪声的影响 ,使得实际采集到的数据为信噪比很低的含噪信号 ,需进行消噪处理。本文将小波变换 ,这一时—频分析理论引入到 X线影像数据的弱信号检测和影像重建工作中 。
Computed Radiography (CR) is being popularly studied in the world recent years. Compared with common X-ray imaging,CR system applies a special kind of digital message carrier, i.e. Imaging Plate (IP), to detect and digitize image data. With the aid of computer, it's possible for CR system to process and reconstruct X-ray image. Because there exists random noises while detecting X-ray image data, what we get finally is noisy signals, which need to be processed. In the paper,Wavelet Transformation (WT), a time-frequency domain analysis theory was introduced into X-ray image data detection and image reconstruction. Based on WT, removal of random noises of CR images has been accomplished in our work.
出处
《光学精密工程》
EI
CAS
CSCD
2000年第5期428-431,共4页
Optics and Precision Engineering
基金
国家自然科学基金
