Investigation of basic imaging properties in digital radiography. 11. Multiple slit-beam imaging technique with image intensifier-TV digital system.
Investigation of basic imaging properties in digital radiography. 11. Multiple slit-beam imaging technique with image intensifier-TV digital system.
复制标题
数字放射线摄影中基本成像特性的研究。
作者：
Kume,Y;Doi,K
我们正在开发一种使用多缝组件 (MSA) 和图像增强器 (II)-TV 数字系统的数字 X 射线成像系统。这种方法的优点是可以显着减少 II-TV 系统中物体的散射和杂光，同时 X 射线利用率保持得比单狭缝光束技术好得多。重建图像的质量与缝宽、前导间隔物、图像帧数、重建算法等诸多参数有关。在本研究中，定量测量了散射和杂光的减少，并分析了图像伪影。研究发现，通过使用 MSA 成像技术，散射和遮蔽眩光的分数可以减少到大约 0.01-0.1，并且分数的大小很大程度上取决于所用 MSA 的狭缝宽度和引线间隔物。这些伪影是由狭缝宽度、引线间隔物和扫描运动的不准确以及图像数据的欠采样引起的。重叠扫描技术可以有效减少重建图像中这些伪影的程度。
We are developing a digital x‐ray imaging system using a multiple slit assembly (MSA) and an image intensifier (II)–TV digital system. The advantage of this approach is that the scatter from an object and the veiling glare in the II–TV system can be reduced significantly while the x‐ray utilization is maintained much better than that with a single slit‐beam technique. The quality of reconstructed images is related to many parameters such as the slit width, the lead spacer, the number of image frames, and the reconstruction algorithm. In this study, reduction of scatter and veiling glare was measured quantitatively, and image artifacts were analyzed. It was found that the fraction of scatter and veiling glare can be reduced to approximately 0.01–0.1 by use of the MSA imaging technique, and that the magnitude of the fractions is strongly dependent upon the slit width and the lead spacer of the MSA used. The artifacts are caused by inaccuracies in the slit width, lead spacer, and scan motion, and by undersampling of image data. The overlap scanning technique was effective in reducing the magnitude of these artifacts in the reconstructed image.