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Neutron tomography in double crystal diffractometers

机译:双晶衍射仪中的中子断层扫描

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Using a double crystal diffractometer (DCD) for tomographic imaging introduces the possibility to use various signals for image contrast. In conventional neutron and X-ray radiography and tomography the contrast signal for imaging arises just from the attenuation in the sample. Due to recent developments in digital imaging tomography gained a lot of importance in medicine and non-destructive testing (NDT). But not all materials deliver an useful contrast concerning attenuation neither in the case of X-rays nor for neutrons. In a DCD attenuation but also other interactions between penetrating radiation and sample can be registered. Besides the common attenuation there are especially refraction and small-angle scattering effects. It will be shown at least for neutrons that from each of these signals recorded as tomographic projections in a DCD an image of the sample can be reconstructed by the means of common filtered back projection (FBP) algorithm. Additionally, all the signals can be registered in one measurement and can be used for independent reconstructions resulting in different images expressing different characteristics of the sample. (C) 2004 Elsevier B.V. All rights reserved.
机译:使用双晶衍射仪(DCD)进行断层成像会引入使用各种信号进行图像对比度的可能性。在常规的中子和X射线摄影和断层摄影中,用于成像的对比信号仅来自样品中的衰减。由于数字成像层析成像的最新发展,在医学和无损检测(NDT)中变得越来越重要。但是,并非所有材料都能在X射线和中子衰减方面都没有提供有用的对比。在DCD衰减中,穿透辐射与样本之间的其他相互作用也可以记录下来。除了常见的衰减以外,还有折射和小角度散射效应。至少对于中子而言,将显示出,这些信号中的每一个都以断层摄影投影形式记录在DCD中,可以通过通用滤波反投影(FBP)算法重建样本图像。另外,所有信号都可以记录在一个测量中,并且可以用于独立的重建,从而得到表示样品不同特性的不同图像。 (C)2004 Elsevier B.V.保留所有权利。

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