Hamamatsu SHR74000 is a newly designed full three-dimensional(3D) whole body positron emission tomography(PET) scanner with small crystal size and large field of view(FOV).With the improvement of sensitivity,the scatt...Hamamatsu SHR74000 is a newly designed full three-dimensional(3D) whole body positron emission tomography(PET) scanner with small crystal size and large field of view(FOV).With the improvement of sensitivity,the scatter events increase significantly at the same time,especially for large objects.Monte Carlo simulations help us to understand the scatter phenomena and provide good references for scatter correction.In this paper,we introduce an effective scatter correction method based on single scatter simulation for the new PET scanner,which accounts for the full 3D scatter correction.With the results from Monte Carlo simulations,we implement a new scale method with special concentration on scatter events from outside the axial FOV and multiple scatter events.The effects of scatter correction are investigated and evaluated by phantom experiments;the results show good improvements in quantitative accuracy and contrast of the images,even for large objects.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No 60772125)the Key Foundation of Guangdong Province of China (Grant No 07117784)Scientific Plan of Zhejiang Province of China (Grant No 2008C23060)
文摘Hamamatsu SHR74000 is a newly designed full three-dimensional(3D) whole body positron emission tomography(PET) scanner with small crystal size and large field of view(FOV).With the improvement of sensitivity,the scatter events increase significantly at the same time,especially for large objects.Monte Carlo simulations help us to understand the scatter phenomena and provide good references for scatter correction.In this paper,we introduce an effective scatter correction method based on single scatter simulation for the new PET scanner,which accounts for the full 3D scatter correction.With the results from Monte Carlo simulations,we implement a new scale method with special concentration on scatter events from outside the axial FOV and multiple scatter events.The effects of scatter correction are investigated and evaluated by phantom experiments;the results show good improvements in quantitative accuracy and contrast of the images,even for large objects.
