Phase objects in synchrotron radiation hard x-ray imaging
Phase objects in synchrotron radiation hard x-ray imaging
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DOI：
10.1088/0022-3727/29/1/023
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发表时间：
1996-01-14
影响因子：
3.4
通讯作者：
Schlenker, M
中科院分区：
文献类型：
--
作者：
Cloetens, P;Barrett, R;Schlenker, M
相位物体很容易通过第三代同步加速器辐射源（例如 ESRF）的硬 X 射线束中的菲涅耳衍射成像，这主要是由于源的角尺寸非常小。相位物体可能会导致晶体的 X 射线衍射图像（形貌图）出现虚假对比度。结果表明，这种对比度可以通过随机相位板来消除，这提供了一种调整光源角度大小的有效方法。通过实验探索和讨论了这种非常简单的技术在硬 X 射线范围内对相位物体进行成像的可能性。它们看起来非常有前途，特别是一块人类椎骨的例子表明，并且可以扩展到相位断层扫描。
Phase objects are readily imaged through Fresnel diffraction in the hard x-ray beams of third-generation synchrotron radiation sources such as the ESRF, due essentially to the very small angular size of the source. Phase objects can lead to spurious contrast in x-ray diffraction images (topographs) of crystals. It is shown that this contrast can be eliminated through random phase plates, which provide an effective way of tailoring the angular size of the source. The possibilities of this very simple technique for imaging phase objects in the hard x-ray range are explored experimentally and discussed. They appear very promising, as shown in particular by the example of a piece of human vertebra, and could be extended to phase tomography.