TY - GEN
T1 - Accelerated MAP reconstructions using an accelerated factor
AU - Tsai, Yu Jung
AU - Hsiao, Ing Tsung
PY - 2010
Y1 - 2010
N2 - In emission tomography, statistical reconstruction has been proved outperforming FBP (filtered backprojection) [1]. ML-EM (maximum likelihood expectation-maximization) [2] algorithm is one of the most widely used statistical reconstruction methods. Although with good image quality, the ML-EM algorithm is challenged by its slow convergence speed and ill-condition problem. To solve for the problems, based on the ideas from the accelerated EM (AEM) [3] and maximum a posteriori EM (MAP-EM) [4] algorithms, we derived two approaches (MAP-AEM1 and MAP-AEM2) in this study to accelerate MAP reconstruction using a bigger step size instead of ordered subsets. The results were compared with ordered-subset methods of both BSREM and MAPCOSEM. From the preliminary results, our methods showed the speedup ability for the traditional MAP-EM.
AB - In emission tomography, statistical reconstruction has been proved outperforming FBP (filtered backprojection) [1]. ML-EM (maximum likelihood expectation-maximization) [2] algorithm is one of the most widely used statistical reconstruction methods. Although with good image quality, the ML-EM algorithm is challenged by its slow convergence speed and ill-condition problem. To solve for the problems, based on the ideas from the accelerated EM (AEM) [3] and maximum a posteriori EM (MAP-EM) [4] algorithms, we derived two approaches (MAP-AEM1 and MAP-AEM2) in this study to accelerate MAP reconstruction using a bigger step size instead of ordered subsets. The results were compared with ordered-subset methods of both BSREM and MAPCOSEM. From the preliminary results, our methods showed the speedup ability for the traditional MAP-EM.
UR - http://www.scopus.com/inward/record.url?scp=79960302615&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2010.5874411
DO - 10.1109/NSSMIC.2010.5874411
M3 - 会议稿件
AN - SCOPUS:79960302615
SN - 9781424491063
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 3278
EP - 3281
BT - IEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010
T2 - 2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010
Y2 - 30 October 2010 through 6 November 2010
ER -