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Effect of iterative reconstruction techniques on image ...
Purpose: We aimed to evaluate the quality of chest computed tomography (CT) images obtained with low-dose CT using three iterative reconstruction (IR) algorithms. Methods: Two 64-detector spiral CT scanners (HDCT and iCT) were used to scan a chest phantom containing 6 ground-glass nodules (GGNs) at 11 radiation dose levels. CT images were reconstructed by filtered back projection or three IR ...
Simulation-based evaluation of OSEM iterative ...
In this study, we investigated the characteristics of the UW-OSEM and the ANW-OSEM iterative reconstruction methods in the context of ligand-receptor PET studies with low counts. The assessment was conducted using replicates of simulated [18F]MPPF acquisitions. The quantitative accuracy obtained with the iterative and analytical methods was ......
Quantitative Comparison of Analytic and Iterative ...
The purpose of the present study was to assess the quantitative accuracy of both iterative reconstruction and 3D acquisition for cardiac PET studies. To this end, an interleaved 2D/3D scan protocol was used to enable comparison of 2D and 3D imaging within the same patient and study, and data were reconstructed with both FBP and OSEM.
Comparative studies of total-variation-regularized sparse ...
Theoretically, the PVDM performs more accurately than the DDM. On iterative reconstruction, the total variation (TV) regularization of an image has been commonly combined in the literature with alternative iterative algorithms to improve the ill-posedness of sparse reconstruction methods. 26–30 26. T.
Comparison of reconstruction methods and quantitative ...
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Analytical image reconstruction methods in emission tomography
The reconstruction methods are divided into analytic and iterative approaches, each one presenting its own advantages and limitations. The choice of one or the other depends basically on the clinical objective of the study and the computational facilities supplied by the imaging system manufacturers.
Comparative evaluation of scatter correction techniques in ...
Much research and development has been concentrated on the scatter compensation required for quantitative 3D positron emission tomography (PET). Increasingly sophisticated scatter correction procedures are under investigation, particularly those based on accurate scatter models and iterative reconstruction-based scatter compensation approaches. The main difference among the correction methods ......
Comparison among Reconstruction Algorithms for ...
Filtered backprojection (FBP) reconstruction and three iterative reconstruction methods, that is, OSEM, OSEM with time-of-flight, and OSEM with both time-of-flight and point-spread-function, were performed for each study. The four reconstruction methods were named as FBP, OSEM, TOF, and TPSF, respectively, for the comparison in this study....
Standardized Uptake Value Using Thyroid Quantitative SPECT ...
The clinical applications of the quantitative single photon emission computed tomography (SPECT)/computed tomography (CT) are being expanded to a variety of fields of nuclear medicine. However, clinical application of quantitative SPECT/CT for the evaluation of Graves’ disease (GD) still needs further investigation. Our aim was to investigate the feasibility of standard uptake value (SUV) of ...
 Quantitative comparison of FBP, EM, and Bayesian ...
For EM and the Bayesian reconstruction methods, we compare reconstruction quality for our empiri-cal (2-D) kernel and the simple triangular kernel shown in Fig. 2. The objective of this comparison is to demonstrate the importance of accurate system modeling for iterative reconstruction, and, more impor-
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