Kato Hideki
S.S. Techno-Engineering Corporation.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2006 Sep 20;62(9):1359-68. doi: 10.6009/jjrt.62.1359.
The anti-scatter grid is generally used as a way of eliminating scattered radiation from X-ray photographs. This does not change even if the detector system changes from an analogue system to a digital system such as the flat-panel detector. We developed a new method that uses software to eliminate scatter components from digital X-ray images taken without the use of an anti-scatter grid. With this software, scatter components are eliminated from the X-ray image according to primary-to-scatter ratios, which were calculated on the basis of an imaginary phantom constructed by the pixel value of the X-ray image and on the spectrum of irradiated X-rays. In a trial calculation using a simulation image, it was confirmed that scatter components are eliminated at a high rate that is generally constant on the whole, irrespective of the kind and presence of the inhomogeneous region. When using this technique, the amount of X-ray exposure to a patient can be substantially reduced compared with that of radiography using the anti-scatter grid. Subsequently, the patient dose can be reduced.
反散射栅通常用作消除X射线照片中散射辐射的一种方式。即使探测器系统从模拟系统变为数字系统，如平板探测器，这一点也不会改变。我们开发了一种新方法，该方法使用软件从未使用反散射栅拍摄的数字X射线图像中消除散射成分。利用该软件，根据基于由X射线图像的像素值构建的虚拟体模和照射X射线的光谱计算出的主散射比，从X射线图像中消除散射成分。在使用模拟图像的试验计算中，证实散射成分以总体上通常恒定的高比率被消除，而与不均匀区域的种类和存在无关。使用该技术时，与使用反散射栅的射线照相相比，患者接受的X射线照射量可大幅减少。随后，患者剂量可以降低。
