EVALUATION OF SECTION SENSITIVITY PROFILES AND IMAGE NOISE IN SPIRAL CT
EVALUATION OF SECTION SENSITIVITY PROFILES AND IMAGE NOISE IN SPIRAL CT
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DOI：
10.1148/radiology.185.1.1523331
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发表时间：
1992-10-01
期刊：
影响因子：
19.7
通讯作者：
MARCHAL, G
中科院分区：
文献类型：
--
作者：
POLACIN, A;KALENDER, WA;MARCHAL, G
螺旋计算机断层扫描（CT）可在单次屏气内对完整器官或身体切片进行连续容积扫描。螺旋CT的几乎所有图像质量特性与传统的逐节CT的相同;然而，存在像素噪声值的变化和节灵敏度曲线（SSP）的形状的退化。计算机模拟，体模测量，和临床研究中使用的SSP和噪声特性的两个新的部分插值算法进行评估。将结果与标准CT和采用常用线性切片插值算法处理的螺旋CT数据进行比较。当应用新算法时，对于每360度旋转的工作台进给距离等于截面厚度，SSP质量的下降是微不足道的;然而，噪声值增加了。SSP宽度增加，工作台进给距离大于部分宽度，新算法的效果不太明显。这些算法的价值主要体现在多平面重建、电影和三维显示的质量提高上。
Spiral computed tomography (CT) offers continuous volume scanning of complete organs or body sections within a single breath hold. Almost all image quality characteristics of spiral CT are identical to those of conventional section-by-section CT; however, there is a change in pixel noise values and degradation in the shape of the section sensitivity profiles (SSPs). Computer simulations, phantom measurements, and clinical studies were used in evaluating the SSP and noise characteristics of two new section-interpolation algorithms. The results were compared with standard CT and spiral CT data processed with the commonly employed linear section-interpolation algorithm. Degradation of SSP quality was insignificant for a table feed distance per 360-degrees revolution equal to the section thickness when the new algorithms were applied; noise values, however, increased. SSP width increased for table feed distances greater than the section width, the effect being less pronounced with the new algorithms. The value of these algorithms is primarily seen in the improved quality of multiplanar reformations and cine and three-dimensional displays.