A new mathematical appoach using the inverse Radon equation for restoration of images in problems of linear two-dimensional x-ray tomography is formulated. In this approach, Fourier transformation is not used, and it gives the chance to create the practical computing algorithms having more reliable mathematical substantiation. Results of software implementation show that for especially for low number of projections, the described approach performs better than standard X-ray tomographic reconstruction algorithms.
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http://dx.doi.org/10.3233/XST-160587 | DOI Listing |
Comput Methods Biomech Biomed Engin
November 2024
CREATIS, CNRS UMR 5220, Inserm U630, INSA de Lyon, Universite de Lyon, Lyon, France.
In this work, we investigate a new deep learning reconstruction method of blood flow velocity within deformed vessels from contrast enhanced X-ray projections and vessel geometry. The principle of the method is to perform linear or nonlinear dimension reductions on the Radon projections and on the mesh of the vessel. These low dimensional projections are then fused to obtain the velocity field in the vessel.
View Article and Find Full Text PDFViruses
September 2024
Institute of Infectious Diseases and Tropical Medicine, LMU University Hospital, LMU Munich, 80802 Munich, Germany.
This study analyzes immune responses to SARS-CoV-2 vaccination and infection, including asymptomatic cases, focusing on infection risks during the Omicron wave, particularly among high-risk healthcare workers. In the KoCo-Impf study, we monitored 6088 vaccinated participants in Munich aged 18 and above. From 13 May to 31 July 2022, 2351 participants were follow-uped.
View Article and Find Full Text PDFFront Public Health
October 2024
Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SESANE/LEPID, Fontenay-aux-Roses, France.
Am J Epidemiol
August 2024
Field Research Branch, Division of Field studies and Engineering, National institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), Department of Health and Human Services (DHHS), Cincinnati, Ohio, USA.
Radon is a known cause of lung cancer. Protective standards for radon exposure are derived largely from studies of working populations that are prone to healthy worker survivor bias. This bias can lead to under-protection of workers and is a key barrier to understanding health effects of many exposures.
View Article and Find Full Text PDFJ Imaging
July 2024
Department of Medical Physics, School of Medicine, University of Patras, 26504 Patras, Greece.
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