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Removing ring artefacts from synchrotron radiation-based hard X-ray tomography data

机译:从基于同步加速器辐射的硬X射线断层扫描数据中去除环形伪像

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In hard X-ray microtomography, ring artefacts regularly originate from improperly functioning pixel elements on the detector or from particles and scratches on the scintillator. We show that due to the high sensitivity of contemporary beamline setups further causes inducing inhomogeneities in the impinging wavefronts have to be considered. We propose in this study a method to correct the thereby induced failure of simple flatfield approaches. The main steps of the pipeline are (ⅰ) registration of the reference images with the radiographs (projections), (ⅱ) integration of the flat-field corrected projection over the acquisition angle, (ⅲ) high-pass filtering of the integrated projection, (ⅳ) subtraction of filtered data from the flat-field corrected projections. The performance of the protocol is tested on data sets acquired at the beamline ID19 at ESRF using single distance phase tomography.
机译:在硬X射线显微断层照相术中,环状伪影通常来自检测器上功能不正常的像素元素或闪烁体上的颗粒和划痕。我们表明,由于当代光束线设置的高灵敏度,必须考虑在入射波阵面中引起不均匀性的其他原因。我们在这项研究中提出了一种方法来纠正由此引起的简单平场方法的失效。管线的主要步骤是(ⅰ)将参考图像与射线照片(投影)配准;(ⅱ)在获取角上对平场校正后的投影进行积分;(ⅲ)对积分投影进行高通滤波; (ⅳ)从平场校正后的投影中减去滤波后的数据。使用单距相层析成像技术在ESRF的束线ID19上采集的数据集上测试协议的性能。

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