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Image reconstruction with a half-detector in single-photon emission computed tomography with nonuniform attenuation

机译:非均匀衰减的单光子发射计算机断层扫描中半探测器的图像重建

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摘要

In parallel beam computed tomography, measured projections at conjugate views are mathematically identical. This symmetry can be exploited for either reducing the scanning angle or the size of the detector arrays. In single-photon emission computed tomography (SPECT), because the gamma rays in the conjugate views suffer different photon attenuation, measured projections at conjugate views are generally different. Therefore, it had been widely considered that projections covering 360 deg and the whole detector face are required for exact reconstruction of the distributions of gamma-ray emitters. In this work, we show that projections covering 360 deg, but acquired with a half-detector viewing half of the image space, provide the necessary information to reconstruct a unique image in SPECT with nonuniform attenuation.
机译:在平行光束计算机断层扫描中,共轭视图上测量的投影在数学上是相同的。这种对称性可用于减小扫描角度或探测器阵列的尺寸。在单光子发射计算机断层扫描 (SPECT) 中,由于共轭视图中的伽马射线受到不同的光子衰减,因此共轭视图下的测量投影通常不同。因此,人们普遍认为,要精确重建伽马射线发射器的分布,需要覆盖360度和整个探测器表面的投影。在这项工作中,我们展示了覆盖 360 度的投影,但通过半探测器观察一半的图像空间来获取,为在 SPECT 中以非均匀衰减重建独特的图像提供了必要的信息。

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