A positron emission tomography (PET) imaging system (10) includes a singles unit (24), a delay unit (26), a scaling unit (28), and a reconstruction unit (30). The singles unit (24) is configured to generate a correction sinogram of random coincidences defined by a coincidence time window tw and a time period t based on rij=2 t si sj where rij is an estimate of the random coincidences in the time period t between singles at detector locations si and sj. The delay unit (26) is configured to determine delay coincidences in the time period t defined by a delay coincidence time window of a paired coincidences including tw to 2 tw. The scaling unit (28) is configured to scale the correction sinogram of random coincidences based on the delay coincidences. The reconstruction unit (30) is configured to iteratively reconstruct one or more images based on the scaled random sinogram and a prompt sinogram for the time period t.
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机译：正电子发射断层扫描（PET）成像系统（ 10 ）包括单身单位（ 24 ），延迟单位（ 26 ），缩放单位（ 28 ）和重建单位（ 30 ）。单打单元（ 24 ）配置为基于r ij生成由重合时间窗口t w 和时间段t定义的随机重合的校正正弦图 = 2 ts i s j 其中r ij 是检测器中单身之间的时间段t中随机重合的估计位置s i 和s j 。延迟单元（ 26 ）被配置为确定在由包括t w 到2 t w 。缩放单元（ 28 ）被配置为基于延迟一致来缩放随机一致的校正正弦图。重构单元（ 30 ）被配置为基于缩放的随机正弦图和时间段的即时正弦图来迭代地重构一个或多个图像。
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