Álvarez-Gómez Juan Manuel, Santos-Blasco Joaquín, Moliner Martínez Laura, Rodríguez-Álvarez María José
Instituto de Instrumentación para Imagen Molecular (I3M), Centro Mixto CSIC-Universitat Politècnica de València, 46022 València, Spain.
J Imaging. 2021 Sep 30;7(10):199. doi: 10.3390/jimaging7100199.
Improvements in energy resolution of modern positron emission tomography (PET) detectors have created opportunities to implement energy-based scatter correction algorithms. Here, we use the energy information of auxiliary windows to estimate the scatter component. Our method is directly implemented in an iterative reconstruction algorithm, generating a scatter-corrected image without the need for sinograms. The purpose was to implement a fast energy-based scatter correction method on list-mode PET data, when it was not possible to use an attenuation map as a practical approach for the scatter degradation. The proposed method was evaluated using Monte Carlo simulations of various digital phantoms. It accurately estimated the scatter fraction distribution, and improved the image contrast in the simulated studied cases. We conclude that the proposed scatter correction method could effectively correct the scattered events, including multiple scatters and those originated in sources outside the field of view.
现代正电子发射断层扫描（PET）探测器能量分辨率的提高为实施基于能量的散射校正算法创造了机会。在此，我们利用辅助窗的能量信息来估计散射分量。我们的方法直接在迭代重建算法中实现，无需正弦图即可生成散射校正图像。目的是在无法使用衰减图作为散射降解的实际方法时，对列表模式PET数据实施一种快速的基于能量的散射校正方法。使用各种数字体模的蒙特卡罗模拟对所提出的方法进行了评估。它准确地估计了散射分数分布，并在模拟研究案例中提高了图像对比度。我们得出结论，所提出的散射校正方法可以有效地校正散射事件，包括多次散射和源自视野外源的散射事件。
