An Improved Ordered Subsets Expectation Maximization Reconstruction
Positron emission computerized tomography (PET) based on Ordered Subsets Expectation Maximization (OS-EM) is usually used to computerized tomography, which imposes the radionuclide to emission positron. But it also has some disadvantage as costing long time and bad reconstruction quality. Filtered Back Projection (FBP) that has many advantages such as simple structure and short reconstruction time is firstly introduced to the initialization stage to accelerate reconstruction. Then, the smoothness method is introduced to improve the reconstruction quality after OS-EM algorithm. The results show that this method has the advantages of fast reconstruction speed and good quality.
KeywordsPositron Emission Tomography Iteration Step Source Image Order Subset Expectation Maximization Reconstruction Quality
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