Investigation of maximum a posteriori probability expectation-maximization for image-based weighting spectral X-ray CT image reconstruction

2018 ◽  
Vol 26 (5) ◽  
pp. 853-864 ◽  
Author(s):  
Zhengdong Zhou ◽  
Runchao Xin ◽  
Shaolin Guan ◽  
Jianbo Li ◽  
Jiali Tu
Keyword(s):  
Image Reconstruction ◽  
Expectation Maximization ◽  
Posteriori Probability ◽  
Maximum A Posteriori ◽  
Ct Image ◽  
A Posteriori ◽  
X Ray ◽  
A Posteriori Probability ◽  
Ct Image Reconstruction

scholarly journals Population pharmacokinetic modeling of isoniazid, rifampin, and pyrazinamide.

1997 ◽  
Vol 41 (12) ◽  
pp. 2670-2679 ◽  
Author(s):  
C A Peloquin ◽  
G S Jaresko ◽  
C L Yong ◽  
A C Keung ◽  
A E Bulpitt ◽  
...  
Keyword(s):  
Expectation Maximization ◽  
High Performance ◽  
Posteriori Probability ◽  
Maximum A Posteriori ◽  
Population Pharmacokinetic ◽  
A Posteriori ◽  
Population Pharmacokinetic Modeling ◽  
A Posteriori Probability ◽  
Modeling Methods ◽  
Elimination Half

Isoniazid (INH), rifampin (RIF), and pyrazinamide (PZA) are the most important drugs for the treatment of tuberculosis (TB). The pharmacokinetics of all three drugs in the plasma of 24 healthy males were studied as part of a randomized cross-over phase I study of two dosage forms. Subjects ingested single doses of INH at 250 mg, RIF at 600 mg, and PZA at 1,500 mg. Plasma was collected for 36 h and was assayed by high-performance liquid chromatography. The data were analyzed by noncompartmental, iterative two-stage maximum a posteriori probability Bayesian (IT2B) and nonparametric expectation maximization (NPEM) population modeling methods. Fast and slow acetylators of INH had median peak concentrations in plasma (C[max]) of 2.44 and 3.64 microg/ml, respectively, both of which occurred at 1.0 h postdose (time of maximum concentrations of drugs in plasma [T(max)]), with median elimination half-lives (t1/2) of 1.2 and 3.3 h, respectively (by the NPEM method). RIF produced a median C(max) of 11.80 microg/ml, a T(max) of 1.0 h, and a t1/2 of 3.4 h. PZA produced a median C(max) of 28.80 microg/ml, a T(max) of 1.0 h, and a t1/2 of 10.0 h. The pharmacokinetic behaviors of INH, RIF, and PZA were well described by the three methods used. These models can serve as benchmarks for comparison with models for other populations, such as patients with TB or TB with AIDS.

scholarly journals Line Integral Alternating Minimization Algorithm for Dual-Energy X-Ray CT Image Reconstruction

2016 ◽  
Vol 35 (2) ◽  
pp. 685-698 ◽  
Author(s):  
Yaqi Chen ◽  
Joseph A. O'Sullivan ◽  
David G. Politte ◽  
Joshua D. Evans ◽  
Dong Han ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Dual Energy ◽  
Ct Image ◽  
Alternating Minimization ◽  
Minimization Algorithm ◽  
Line Integral ◽  
X Ray ◽  
Alternating Minimization Algorithm ◽  
Ct Image Reconstruction
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