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Comparative Overview of Brain Perfusion Imaging Techniques ...
Different techniques, such as pulse height analysis, use of multiple energy windows, or deconvolution, allow subtraction of the scatter from the projection data before the image reconstruction. Finally, several iterative reconstruction methods such as ordered subsets expectation maximization have been proposed recently to correct images for ......
Knowledge-based iterative model reconstruction ...
The aim of this study was to compare image quality of low tube voltage cerebral computed tomography angiography (CTA) reconstructed with knowledge-based iterative model reconstruction (IMR), filtered back projection (FBP), and hybrid iterative reconstruction (HIR).. A total of 101 patients with suspected cerebrovascular diseases were enrolled and randomized into 2 groups, 100 kVp tube voltage ......
Quantitative Image Analysis | Physics and Instrumentation ...
For stationary IQ phantom scans from 1 cm diameter ROIs, the average SDs of mean and maximum RCs ranged from 1.4% to 8.0%, depending on the methods of acquisition and reconstruction (coefficients of variation range 2.5% to 9.8%). Similar SDs were observed for both analytic and iterative reconstruction methods .
The effect of different image reconstruction techniques on ...
Iterative reconstruction had favourable results for the DECT analysis: a significantly smaller spread for each material in the ρ e-Z eff space and lower Z eff and ρ e residuals (on average 24 and 25% lower, respectively). In terms of image quality assurance, the techniques FDK, Iterative FDK and SART provided acceptable results.
Feasibility of Iterative Model Reconstruction for ...
Recently introduced iterative reconstruction techniques for CT could reduce the quantum noise ... These methods might dramatically reduce the image noise compared with the HIR technique and cause the results in our study. In the quantitative image analysis, ... an evaluation in 60 patients of the comparative value of CT, MRI, and myelo-CT ......
Iterative Methods for Image Reconstruction
Iterative Methods for Image Reconstruction Jeffrey A. Fessler EECS Department The University of Michigan ISBI Tutorial Apr. 6, 2006 0.0 c J. Fessler, March 15, 2006 p0intro These annotated slides were prepared by Jeff Fessler for attendees of the ISBI tutorial on statisti-cal image reconstruction methods.
Methods for Clinical Evaluation of Noise Reduction ...
ITERATIVE RECONSTRUCTION SUMMARY OF TECHNIQUES 1.) To provide an overview of existing noise reduction strategies for low dose computed tomography (CT), including filtered back projection, image-space denoising, projection-space denoising, and iterative reconstruction. 2.) To review quantitative and qualitative tools and metrics for evaluating...
Iterative Reconstruction Technique for Reducing Body ...
Quantitative Analysis Two abdominal imaging fellows not involved in qualitative data analysis made quantitative noise measurements on a total of 36 data sets: 12 low-dose CT without adaptive statistical iterative reconstruction, 12 low-dose CT with adaptive sta-tistical iterative reconstruction, and 12 routine-dose comparison CT....
Comparative assessment of three image reconstruction ...
Methods: In this Institutional Review Board-approved study, contrast-enhanced (CE) abdominopelvic CT scans from 23 patients were reconstructed using filtered back projection (FBP), adaptive statistical iterative reconstruction (ASiR) and iterative reconstruction in image space (IRIS) and were reviewed by two blinded readers....
A Short Introduction To Qualitative Comparative Analysis
∞ See for a review of the book: Verweij, S. (2013). Set-theoretic methods for the social sciences: A guide to qualitative comparative analysis. International Journal of Social Research Methodology, 16(2), 165-166. ∞ Seminal works: ∞ Ragin, C.C. (1987). The comparative method: Moving beyond qualitative and quantitative strategies....
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