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Joint estimation of attenuation and emission images from PET scans

机译:宠物扫描的衰减和发射图像的联合估计

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In modern PET scanners, image reconstruction is performed sequentially in two steps regardless of the reconstruction method: 1. Attenuation correction factor computation (ACF) from transmission scans, 2 Emission image reconstruction using the computed ACFs. This reconstruction scheme does not use all the information in the transmission and emission scans. Post-injection transmission scans contain emission contamination which includes information about emission parameters. Conversely emission scans contain information about the attenuating medium. To use all the available information, we propose a joint estimation approach that estimates the attenuation map and the emission image from these two scans. The penalized-likelihood objective function is nonconvex for this problem. We propose an algorithm based on paraboloidal surrogates that alternates between emission and attenuation parameters and is guaranteed to monotonically decrease the objective function.
机译:在现代宠物扫描仪中,无论重建方法如何,图像重建都按顺序执行:1.衰减校正因子计算(ACF)从传输扫描,2使用计算的ACF的发射图像重建。该重建方案不使用传输和发射扫描中的所有信息。后喷射传输扫描包含排放污染,包括有关发射参数的信息。相反,发射扫描包含有关衰减媒介的信息。要使用所有可用信息,我们提出了一种联合估计方法,估计衰减图和来自这两个扫描的发光图像。受到惩罚的可能性目标函数是此问题的非谐波。我们提出了一种基于抛物面代理的算法,其在发射和衰减参数之间交替,并保证单调地降低目标函数。

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