CAJ | 학술논문

不完全投影数据的代数重建问题一直是CT应用中的热点问题.通过对相互垂直角度投影图像之间的关系分析,文中提出一种改进的代数重建(ART)算法.该算法采用记录射线穿过网格编号和射线与网格相交长度的方法计算投影系数矩阵,并在反投影过程中对不完全投影数据采用凸集投影约束的方法进行重建.实验表明该算法与ART算法相比,图像重建的速度与图像重建的质量都得到较大提高.
불완전투영수거적대수중건문제일직시CT응용중적열점문제.통과대상호수직각도투영도상지간적관계분석,문중제출일충개진적대수중건(ART)산법.해산법채용기록사선천과망격편호화사선여망격상교장도적방법계산투영계수구진,병재반투영과정중대불완전투영수거채용철집투영약속적방법진행중건.실험표명해산법여ART산법상비,도상중건적속도여도상중건적질량도득도교대제고.
Algebraic reconstruction based on incomplete projection data is a hot issue in CT application. An improved algebraic reconstruction technique (ART) is proposed based on the analysis of relationships between images with mutual perpendicular projection angles. The projection coefficient matrix is calculated by recording the indices of ray-cross grids and the lengths of grid-ray intersections. In the process of reverse projection, POCS restriction is used to reconstruct the image from the incomplete data. The experimental results show that compared with the ART algorithm, the proposed algorithm greatly improves the speed and the quality of image reconstruction.