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Rotation Detection in Chest Radiographs Based on Generalized Line Histogram of Rib-Orientations

机译:基于肋骨方向线直方图的胸部X线片旋转检测

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We present a generalized line histogram technique to compute global rib-orientation for detecting rotated lungs in chest radiographs. We use linear structuring elements, such as line seed filters, as kernels to convolve with edge images, and extract a set of lines from the posterior rib-cage. After convolving kernels in all possible orientations in the range [0, p), we measure the angle for which the line histogram has maximum magnitude. This measure provides a good approximation of the global chest rib-orientation for each lung. A chest radiograph is said to be upright if the difference between the orientation angles of both lungs with respect to the horizontal axis, is negligible. We validate our method on sets of normal and abnormal images and argue that rib orientation can be used for rotation detection in chest radiographs as aid in quality control during image acquisition, and to discard images from training and testing data sets. In our test, we achieve a maximum accuracy of 90%.
机译:我们提出了一种通用的线直方图技术来计算全局肋骨方向,以检测胸部X光片中的旋转肺部。我们使用线性构造元素(例如线种子过滤器)作为内核与边缘图像进行卷积,并从后肋骨笼中提取出一组线。在范围[0,p)内的所有可能方向上对内核进行卷积后,我们测量线直方图具有最大幅度的角度。该方法为每个肺部提供了一个很好的整体胸肋方向的近似值。如果两个肺部相对于水平轴的定向角之间的差异可忽略不计,则称胸部X光片是直立的。我们在正常和异常图像集上验证了我们的方法,并认为肋骨方向可用于胸部X光片的旋转检测,以帮助在图像获取期间进行质量控制,并从训练和测试数据集中丢弃图像。在我们的测试中,我们达到了90%的最大精度。

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