Computer simulation of CT mammography using a flat-panel imager
Computer simulation of CT mammography using a flat-panel imager
复制标题
使用平板成像仪对 CT 乳房 X 线摄影进行计算机模拟
DOI：
10.1117/12.480015
复制
发表时间：
2003
期刊：
影响因子：
3.8
通讯作者：
X. Gong
中科院分区：
文献类型：
--
作者：
Aruna A. Vedula;S. Glick;X. Gong
已经开发了软件来模拟锥形束CT乳腺X射线摄影成像系统，该系统由X射线管和绕下垂乳房同时旋转的平板探测器组成。模拟使用解析表达式或射线跟踪来生成由输入X射线能量谱规定的以1 keV间隔的乳房体模的投影集。X射线焦斑被建模为具有高斯分布。该探测器被建模为非晶硅（aSi：H）平板成像仪，使用结构化的碘化铯闪烁体。通过将每个能量间隔处的投影图像的统计变化建模为缩放泊松过程来模拟通过检测器的噪声传播。闪烁体模糊是通过使用经验确定的调制传递函数来模拟的。在引入噪声和探测器模糊之后，然后组合在每个能量下模拟的投影集，并使用Feldkamp的锥束重建算法进行重建。使用该框架，可以研究多个采集和重建参数的影响。示出了一些示例，包括kVp设置和投影角度的数量对重建图像的影响。
Software has been developed to simulate a cone-beam CT mammography imaging system that consists of an x-ray tube and a flat-panel detector that rotate simultaneously around the pendant breast. The simulation uses an analytical expression or ray-tracing to generate projection sets of breast phantoms at 1 keV intervals dictated by the input x-ray energy spectra. The x-ray focal spot was modeled as having a Gaussian distribution. The detector was modeled as an amorphous silicon (aSi:H) flat-panel imager that uses a structured CsI scintillator. Noise propagation through the detector was simulated by modeling statistical variations of the projection images at each energy interval as a scaled Poisson process. Scintillator blurring was simulated by using an empirically determined modulation transfer function. After introducing noise and detector blur, projection sets simulated at each energy were then combined and reconstructed using Feldkamp's cone-beam reconstruction algorithm. Using this framework, the effects of a number of acquisition and reconstruction parameters can be investigated. Some examples are shown including the impact of the kVp setting and the number of projection angles on the reconstructed image.
影响因子：
3.8
作者：
SIDDON, RL
通讯作者：
SIDDON, RL
影响因子：
3.8
作者：
Siewerdsen, JH;Antonuk, LE;Cunningham, IA
通讯作者：
Cunningham, IA