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    • 10. 发明授权
    • Method of removing foil shadows of a synchronous grid, and a radiographic apparatus using the same
    • 去除同步网格的箔阴影的方法,以及使用其的射线照相设备
    • US08737568B2
    • 2014-05-27
    • US13324098
    • 2011-12-13
    • Akinori Fujita
    • Akinori Fujita
    • G21K1/10
    • A61B6/487A61B6/4233A61B6/4291A61B6/4441A61B6/5252A61B6/588
    • An extracting step (step S1) extracts uninfluenced pixels with a relatively high degree of certainty, while avoiding influences of random quantum noise as much as possible. An approximate fluoroscopic image is obtained based on such uninfluenced pixels (step S2). Thus, accuracy of the approximate fluoroscopic image can be improved over that of the prior art. Therefore, a grid foil shadow image (step S3) and a foil shadow standard image (step S4) calculated successively based on the approximate fluoroscopic image have improved accuracy over the prior art. As a result, while inhibiting influences of random quantum noise, a foil shadow removed image can be obtained which is free from artifacts due to distortion of a synchronous grid.
    • 提取步骤(步骤S1)尽可能地避免随机量子噪声的影响,提取具有相对较高确定性的未受影响的像素。 基于这种未受影响的像素获得近似透视图像(步骤S2)。 因此,与现有技术相比,可以提高近似透视图像的精度。 因此,与现有技术相比,基于近似透视图像连续计算的网格箔影像(步骤S3)和箔影标准图像(步骤S4)具有提高的精度。 结果,在抑制随机量子噪声的影响的同时,由于同步电网的失真,可以获得没有伪影的箔影去除图像。