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A preliminary study of multiple-image computed tomography

机译:多图像计算机断层扫描的初步研究

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In conventional computed tomography (CT) a single volumetric image representing the linear attenuation coefficient of an object is produced. For weakly absorbing tissues, the attenuation of the X-ray beam may not be the best description of disease-related information. In this work we present a new volumetric imaging method, called multiple-image computed tomography (MICT), that can concurrently produce several images from a set of measurements made with a single X-ray beam. MICT produces three volumetric images that represent the attenuation, refraction, ultra-small-angle scattering properties of an object. The MICT method is implemented to reconstruct images of a physical phantom and a biological object from measurement data produced by a synchroton light source. An iterative reconstruction method is employed for reconstruction of MICT images from experimental data sets that contains enhanced Poisson noise levels that are representative of future benchtop implementations of MICT. We also demonstrated that images produced by the DEI-CT method (the predecessor of MICT) can contain significant artifacts due to ultra-small-angle scattering effects while the corresponding MICT images do not.
机译:在常规的计算机断层摄影(CT)中,产生表示物体的线性衰减系数的单个体积图像。对于吸收较弱的组织,X射线束的衰减可能不是疾病相关信息的最佳描述。在这项工作中,我们提出了一种新的体积成像方法,称为多图像计算机断层扫描(MICT),该方法可以从使用单个X射线束进行的一组测量中同时产生几幅图像。 MICT产生三个体积图像,分别表示对象的衰减,折射,超小角度散射特性。 MICT方法用于从同步光源产生的测量数据中重建人体模型和生物物体的图像。一种迭代重建方法用于从实验数据集中重建MICT图像,该实验数据集包含增强的Poisson噪声水平,该水平代表了MICT的未来台式实现方式。我们还证明了DEI-CT方法(MICT的前身)产生的图像由于超小角度散射效应而可能包含明显的伪影,而相应的MICT图像则没有。

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