摘要
目的介绍了目前主流的PET散射校正方法,并进行了横向评估,最后讨论了目前散射校正存在的问题和发展方向。方法基于东软医疗系统股份有限公司NeuWise Pro PET/CT产品进行仿真实验,评估视野外核素分布对每种方法的散射估计精度影响。结果视野外部分的核素产生的散射事件,对散射的空间分布存在明显影响,应该纳入模型考虑的范围。蒙特卡罗计算法的散射估计精度更高。结论临床上,若视野外临近部分活度较高,如脑部、肝部、肾脏和膀胱等,很可能会导致散射估计出现偏差。考虑视野外核素分布的蒙特卡罗法散射估计,有助于提高散射分布的估计精度。
Objective Current mainstream PET scattering correction methods are introduced and evaluated horizontally,and finally,the existing problems and development direction of scattering correction are discussed.Methods Based on NeuWise Pro PET/CT products of Neusoft Medical System Co.Ltd.,the simulation experiment is carried out to evaluate the influence of radionuclide distribution out of FOV(field of view)on the scattering estimation accuracy of each method.Results The scattering events produced by radionuclide out of FOV have an obvious impact on the spatial distribution of scattering,which should be considered in the model.The scattering estimation accuracy of Monte Carlo method is higher than single scatter simulation(SSS).Conclusion Clinically,if the activity of the adjacent parts out of the FOV is high,such as brain,liver,kidney and bladder,it is likely to lead to the deviation of scattering estimation.Considering the Monte Carlo scattering estimation of the distribution of radionuclide out of FOV,it’s helpful to improve the accuracy of scattering distribution estimation.
作者
孙智鹏
李明
马健
马瑾瑾
梁国栋
SUN Zhipeng;LI Ming;MA Jian;MA Jinjin;LIANG Guodong(Neusoft Medical Systems Co.Ltd.,Shenyang,110167)
出处
《中国医疗器械杂志》
2023年第1期47-53,共7页
Chinese Journal of Medical Instrumentation
关键词
PET
图像重建
散射校正
蒙特卡罗计算法
PET
image reconstruction
scattering correction
Monte Carlo algorithm
