Restoration of lost frequency in OpenPET imaging: comparison between the method of convex projections and the maximum likelihood expectation maximization method

2014 ◽  
Vol 7 (2) ◽  
pp. 329-339 ◽  
Author(s):  
Hideaki Tashima ◽  
Takayuki Katsunuma ◽  
Hiroyuki Kudo ◽  
Hideo Murayama ◽  
Takashi Obi ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Expectation Maximization ◽  
Maximum Likelihood Expectation Maximization

APPLICATION OF THE FOREST SHIELDING FACTOR TO THE MAXIMUM-LIKELIHOOD EXPECTATION MAXIMIZATION METHOD FOR AIRBORNE RADIATION MONITORING

2019 ◽  
Vol 184 (3-4) ◽  
pp. 400-404 ◽  
Author(s):  
M Sasaki ◽  
Y Sanada ◽  
A Yamamoto
Keyword(s):  
Maximum Likelihood ◽  
Expectation Maximization ◽  
Attenuation Factor ◽  
Radiation Monitoring ◽  
Actual Measurement ◽  
Shielding Factor ◽  
Maximum Likelihood Expectation Maximization ◽  
Em Method ◽  
Field Radiation ◽  
Aerial Vehicle

Abstract The maximum-likelihood expectation maximization (ML-EM) method is expected to improve the accuracy of airborne radiation monitoring using an unmanned aerial vehicle. The accuracy of the ML-EM method depends on various parameters, including detector efficiency, attenuation factor, and shielding factor. In this study, we evaluate the shielding factor of trees based on several field radiation measurements. From the actual measurement, the shielding factors were well correlated with the heights of the trees. The evaluated shielding factors were applied to the ML-EM method in conjunction with the measured data obtained from above the Fukushima forest. Compared with the conventional methods used for calculating the dose rate, the proposed method is found to be more reliable.

A maximum likelihood expectation maximization algorithm with thresholding

2005 ◽  
Vol 29 (7) ◽  
pp. 571-578 ◽  
Author(s):  
Keh-Shih Chuang ◽  
Meei-Ling Jan ◽  
Jay Wu ◽  
Jeng-Chang Lu ◽  
Sharon Chen ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Expectation Maximization ◽  
Expectation Maximization Algorithm ◽  
Maximum Likelihood Expectation Maximization
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