Robust Algorithm for Denoising of Photon-Limited Dual-Energy Cone Beam CT Projections

Autor: Luis A. Zavala-Mondragon, Fons van der Sommen, Danny Ruijters, Klaus J. Engel, Heidrun Steinhauser, Peter H.N. de With

Publikováno v: ISBI
ISBI 2020-2020 IEEE International Symposium on Biomedical Imaging, 867-871
STARTPAGE=867;ENDPAGE=871;TITLE=ISBI 2020-2020 IEEE International Symposium on Biomedical Imaging

Dual-Energy CT offers significant advantages over traditional CT imaging because it offers energy-based awareness of the image content and facilitates material discrimination in the projection domain. The Dual-Energy CT concept has intrinsic redundan

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53777ea09ec8318fbb91835db320b077
https://doi.org/10.1109/isbi45749.2020.9098442

[Untitled]

Autor: Klaus-J. Engel

Publikováno v: Positivity. 1:103-124

Many evolutionary systems can be described by an abstract Cauchy problem governed by an operator matrix. Assuming this problem to be “one-sided coupled” and “well-posed” we study in this paper the positivity and the stability of the associate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::01f85a14aea681ea73f19cf1833d99f9
https://doi.org/10.1023/a:1009794800971

?Neglect of Diatomic Differential Overlap? in nonempirical quantum chemical orbital theories. III. On the spectrum of the overlap matrix for diatomic molecules over locally orthogonalized basis functions

Autor: Klaus Neymeyr, Klaus J. Engel

Publikováno v: International Journal of Quantum Chemistry. 53:537-540

The sum of the smallest and the greatest eigenvalue of the overlap matrix of diatomic molecules in a basis of locally orthogonalized linearly independent functions is equal to 2. Therewith, polynomial expansion techniques for the justification of the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85b350f4aec139f30a857f7188eaf9e6
https://doi.org/10.1002/qua.560530510

Growth Estimates for Semigroups Generated by 2Sx2 Operator Matrices

Autor: Klaus-J. Engel

Publikováno v: Results in Mathematics. 20:444-453

In this paper we give an explicit formula for semigroups generated by 2×2 operator matrices. Using this formula we can derive an estimate for the growth bound of the associated matrix generator. Finally these results are applied to a complete second

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fc2986473f35dd602785be07b225e170
https://doi.org/10.1007/bf03323185

Polynomial operator matrices as generators: The general case

Autor: Klaus-J. Engel

Publikováno v: Integral Equations and Operator Theory. 13:175-192

Of concern are systems of linear evolution equations $$(ACP)\dot u(t) = Au(t),u(0) = u_0 ,$$ whereu is a function with values in a product Banach space ɛ:=E n andA=(p ij (A)) is anxn matrix whose entries are polynomials in a fixed linear possibly un

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09bc28e0f341f8082d0115fe94d97079
https://doi.org/10.1007/bf01193755