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Image resolution improvement based on sinogram super-resolution in PET

机译:基于正弦图超分辨率的PET图像分辨率提高

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One of the limits of PET imaging is the low spatial resolution due to a predetermined detector width. To overcome this limit, we may increase the number of samples by using the wobbling motion. Since the line spread function (LSF) of the sinogram is determined by the detector width, however, the increase of the number of samples is not sufficient to improve the sinogram resolution. In this paper, based on oversampled data obtained from the wobbling motion, we propose a novel and efficient super-resolution (SR) scheme for the sinogram. Since the proposed SR scheme adopts the penalized expectation maximization (EM) algorithm, it guarantees non-negative values of the super-resolved sinogram data. Through the experiments, we demonstrate that the proposed SR scheme can noticeably improve the spatial image resolution.
机译:PET成像的限制之一是由于预定的检测器宽度而导致的低空间分辨率。为了克服这个限制,我们可以通过使用摆动运动来增加样本数量。但是,由于正弦图的线扩展函数(LSF)由检测器的宽度决定,因此,采样数量的增加不足以提高正弦图的分辨率。在本文中,基于从摆动运动中获得的过采样数据,我们为正弦图提出了一种新颖而有效的超分辨率(SR)方案。由于建议的SR方案采用了惩罚期望最大化(EM)算法,因此可以保证超分辨正弦图数据的非负值。通过实验,我们证明了提出的SR方案可以显着提高空间图像分辨率。

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