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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >First realisation of a three-dimensional refraction contrast computerised neutron tomography
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First realisation of a three-dimensional refraction contrast computerised neutron tomography

机译：三维折射对比计算机中子断层扫描的首次实现

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摘要

We performed tomographic investigations of a sample with a special double crystal diffractometer (DCD) using only the refraction of a neutron beam as imaging signal. Up to now refraction contrast tomographies with DCDs have been performed with the standard detectors and linear position sensitive detectors (PSD). Especially the combination of a bent crystal type DCD with a PSD saved exposure time and increased the accuracy of the reconstructed image. However, the reconstructed objects had to be (high) slices of an object (having congruent cross sections in the height) due to the lack of any vertical resolution. Hence only two-dimensional slices of samples could be reconstructed and imaged. As the refraction effect is measured in a horizontal plane of scattering, other refraction angles out of that plane of scattering could be neglected. Therefore, a three-dimensional reconstruction of the sample volume becomes possible with a two-dimensional position sensitive detector. First results achieved by this set-up using the refraction contrast method will be given.
机译：我们仅使用中子束的折射作为成像信号，使用特殊的双晶衍射仪（DCD）对样品进行了层析成像研究。到目前为止，已经使用标准检测器和线性位置敏感检测器（PSD）进行了带DCD的折射对比断层扫描。特别是将弯曲晶体型DCD与PSD结合使用，可以节省曝光时间并提高重建图像的准确性。但是，由于缺乏垂直分辨率，因此重建的对象必须是对象的（高）切片（在高度上具有一致的横截面）。因此，仅二维样本切片可以被重建和成像。由于在散射的水平面中测量了折射效果，因此可以忽略该散射平面之外的其他折射角。因此，利用二维位置敏感检测器可以对样品体积进行三维重建。将给出通过使用折射对比方法进行此设置所获得的第一个结果。

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