Focal spot calibration in a digital breast tomosynthesis system
Focal spot calibration in a digital breast tomosynthesis system
复制标题
数字乳腺断层合成系统中的焦点校准
DOI：
10.3938/jkps.60.1457
复制
发表时间：
2012
影响因子：
0.6
通讯作者：
Young
中科院分区：
文献类型：
--
作者：
Jaegu Choi;Sun;Young
数字乳腺断层合成摄影（DBT）技术是一种很有前途的模式，用于乳腺癌的早期检测，并可以提供清晰的诊断图像，其中组织重叠的影响得到缓解。在DBT系统中，系统几何形状的精确校准对于成功的图像重建是必不可少的。在探测器平面处的X射线管中的焦斑的几何校准是DBT系统的最关键参数之一。在本文中，一种新的方法，使用多孔准直器和迭代校准算法的报告，以估计焦斑在探测器平面的位置。迭代算法是基于准直器图像中的面积-距离关系。这一关系的线性已经在经验和理论上得到了验证。无论焦斑在图像中的位置如何，都已经实现了焦斑估计。共15个DBT系统采集的投影图像已成功地重建与我们的新方法提供的焦斑位置的几何信息，焦斑估计方法，本文提出的定位光源，不能被视为或访问可能是一个有用的解决方案。
Digital breast tomosynthesis (DBT) technology is a promising modality for the early detection of breast cancer and could provide clear diagnostic images in which the effect of tissue overlap is alleviated. Accurate calibration of the system geometry is essential for successful image reconstruction in DBT systems. The geometrical calibration of the focal spot in the X-ray tube at the detector plane is one of the most critical parameters of a DBT system. In this paper, a new method using a multi-hole collimator and an iterative calibration algorithm is reported in order to estimate the position of the focal spot at the detector plane. The iterative algorithm is based on the area-distance relationship in the collimator image. The linearity of this relationship has been verified both empirically and theoretically. A focal spot estimate has been achieved regardless of the location of the focal spot in the image. A total of 15 projection images acquired with the DBT system have been successfully reconstructed with geometric information about the focal spot position provided by our new method, and the focal spot estimate method proposed in this paper could be a useful solution for locating optical sources that cannot be viewed or accessed.