Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Levon, Vogelsang"'
Autor:
Si Li, David H. Feiglin, Levon Vogelsang, C. Ross Schmidtlein, Lixin Shen, Edward D. Lipson, Andrzej Krol, Yuesheng Xu, Jiahan Zhang
Publikováno v:
Medical Physics. 42:4872-4887
Purpose: The authors have recently developed a preconditioned alternating projection algorithm (PAPA) with total variation (TV) regularizer for solving the penalized-likelihood optimization model for single-photon emission computed tomography (SPECT)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00a0fe886c40886a195a0d8e2cd5fd6d
https://doi.org/10.1118/1.4926846
https://doi.org/10.1118/1.4926846
Autor:
Si, Li, Jiahan, Zhang, Andrzej, Krol, C Ross, Schmidtlein, Levon, Vogelsang, Lixin, Shen, Edward, Lipson, David, Feiglin, Yuesheng, Xu
Publikováno v:
Medical physics. 42(8)
The authors have recently developed a preconditioned alternating projection algorithm (PAPA) with total variation (TV) regularizer for solving the penalized-likelihood optimization model for single-photon emission computed tomography (SPECT) reconstr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::1c88adc827517e6f434b0510a7099a0b
https://pubmed.ncbi.nlm.nih.gov/26233214
https://pubmed.ncbi.nlm.nih.gov/26233214
Autor:
Andrzej Krol, Levon Vogelsang, Yuesheng Xu, Jiahan Zhang, David H. Feiglin, Lixin Shen, Si Li
Publikováno v:
Medical Imaging 2013: Physics of Medical Imaging.
The objective of this study was to develop very low noise and high-contrast-to-noise ratio fast proximity algorithm for MAP ECT reconstruction that would allow significant (factor of two or more) patient’s dose reduction, as compared to conventiona
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07b7dd0a4f9110736cd51f60b5b326c1
https://doi.org/10.1117/12.2008153
https://doi.org/10.1117/12.2008153
Publikováno v:
SPIE Proceedings.
The purpose of this study was to develop and implement an accurate and computationally efficient method for determination of the mesh-domain ssssssystem matrix including attenuation compensation for Ordered Subsets Expectation Maximization (OSEM) Sin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4292157ddb49266525518b270562aff
https://doi.org/10.1117/12.844427
https://doi.org/10.1117/12.844427
Publikováno v:
SPIE Proceedings.
The purpose of this study was investigation of the L -curve method performance for the optimized hyperparameter selection in maximum a posteriori (MAP) Ordered Subsets Expectation Maximization (OSEM) Single Photon Computed Emission Tomography (SPECT)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b547af7365c7d4f0d446681663be01c
https://doi.org/10.1117/12.844614
https://doi.org/10.1117/12.844614
Autor:
A. Pogany, Russell Kincaid, Andrew W. Stevenson, Sylvain Fourmaux, Cristina Serbanescu, Edward D. Lipson, Marina Servol, Levon Vogelsang, Hongwei Ye, Andrzej Krol, Steve Wilkins, Yakov Nesterets, Jean-Claude Kieffer
Publikováno v:
Proceedings of SPIE--the International Society for Optical Engineering. 7078
We are developing and exploring the imaging performance of, an in vivo, in-line holography, x-ray phase-contrast, micro-CT system with an ultrafast laser-based x-ray (ULX) source. By testing and refining our system, and by performing computer simulat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::431d62c752cfc0844f607417fdd86bbf
https://pubmed.ncbi.nlm.nih.gov/20046808
https://pubmed.ncbi.nlm.nih.gov/20046808
Autor:
Yuesheng Xu, Xiaofei Hu, Yao Lu, Levon Vogelsang, Edward D. Lipson, Andrzej Krol, David Feiglin, Lixin Shen
Publikováno v:
SPIE Proceedings.
In order to improve reconstructed image quality, we investigated performance of OSEM mesh-domain SPECT reconstruction with explicit prior anatomical and physiological information that was used to perform accurate attenuation compensation. It was acco
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4b11fc84a18ba31d567fbf8ec94c058
https://doi.org/10.1117/12.813815
https://doi.org/10.1117/12.813815
Publikováno v:
SPIE Proceedings.
To improve quality of OSEM SPECT reconstruction in the mesh domain, we implemented an adaptive mesh generation method that produces tomographic mesh consisting of triangular elements with size and density commensurate with geometric detail of the obj
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd90c1bb5acbb46a206a3c852968b697
https://doi.org/10.1117/12.813866
https://doi.org/10.1117/12.813866
Autor:
Levon Vogelsang, Andrzej Krol, Edward D. Lipson, David Feiglin, Xiaofei Hu, Bo Yu, Yuesheng Xu, Yao Lu
Publikováno v:
SPIE Proceedings.
A new method for attenuation compensation (AC) in mesh-domain SPECT OSEM reconstruction using strip-area approximation (SAAC) is introduced and compared to sing le-ray AC (SRAC). SAAC uses the polygonal area of the intersection of a mesh element (ME)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::75d45cbe4b23fb87c955dfffce8af846
https://doi.org/10.1117/12.813750
https://doi.org/10.1117/12.813750
Autor:
Xiaofei Hu, Edward D. Lipson, Yao Lu, David Feiglin, Yuesheng Xu, Andrzej Krol, Lixin Shen, Hongwei Ye, Levon Vogelsang
Publikováno v:
SPIE Proceedings.
To improve the speed and quality of ordered-subsets expectation-maximization (OSEM) SPECT reconstruction, we have implemented a content-adaptive, singularity-based, mesh-domain, image model (CASMIM) with an accurate algorithm for estimation of the me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9add9b14bb9d63b83721d4f386741d8f
https://doi.org/10.1117/12.773082
https://doi.org/10.1117/12.773082