ACKNOWLEDGEMENTS I would like to thank my advisor, Dr. Hengyong Yu, who first introduced me to the wonderful world of CT image reconstruction. He devoted a great deal of time to instruct me throughout the years. His inspiration, constant support and valuable advice encouraged me to conquer the hardship both in research and life. I would also like to thank my co-advisor, Dr. Ge Wang, whose valua...

The importance of localized phase in signal representation is investigated. The convergence rate of the POCS algorithm (Projection Onto Convex Sets) used for image reconstruction from spectral phase is deened and analyzed, and the characteristics of images optimally represented by phase-only information are presented. It is concluded that images of geometric form are most eeciently represented ...

Accurate scatter compensation in SPECT can be performed by modelling the scatter response function during the reconstruction process. This method is called reconstruction-based scatter compensation (RBSC). It has been shown that RBSC has a number of advantages over other methods of compensating for scatter, but using RBSC for fully 3D compensation has resulted in prohibitively long reconstructi...

Objective The aim of this study was to compare the contrast gray white matter between forward-projected model-based iterative reconstruction solution (FIRST) and hybrid (IR) by measuring computed tomography value brain parenchyma. Methods Computed values in 15 areas 21 patients (7 males, 14 females; average age, 49.5 ± 10.7 years) were measured compared FIRST IR with filtered back projection (F...

Iterative Algorithms can obtain good reconstruction image for enough Iterative times in the technique ct image reconstruction. The order method of the Weighted Distance Orthogonal (WDO) is introduced in this paper to accelerate the Iterative reconstruction, which improves greatly the access mode of ART to projection data, based on the crucial effect that the access order of projection date has ...

The role of phase in the spectra of digital type is examined. Characters and text are found to have more information in the phase than in the magnitude, just as for natural images. For letterforms, this means that the position of features, not their size, has the greatest influence on their discrimination. An iterative reconstruction of characters from their phase and from a magnitude character...

This paper is written for physicians and presents basic principles of image reconstruction in nuclear medicine. Both analytical and iterative methods are discussed without rigorous mathematics. q 2001 Elsevier Science Ltd. All rights reserved.

This article describes a quantitative evaluation of visualizing small vessels using several image reconstruction methods in computed tomography. Simulated vessels with diameters of 1-6 mm made by 3D printer was scanned using 320-row detector computed tomography (CT). Hybrid iterative reconstruction (hybrid IR) and model-based iterative reconstruction (MBIR) were performed for the image reconstr...