Results 51 to 60 of about 5,344,290 (172)

Peculiar Magnetosphere‐Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The auroral‐like sporadic E‐layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing questions regarding the physical processes responsible for the substantial ...
Lígia A. Da Silva, Hui Li, Laysa C. A. Resende, Vânia F. Andrioli, Angela M. Santos, Juliano Moro, Paulo R. Jauer, Luis Eduardo Vieira, Lívia R. Alves, José Paulo Marchezi, Jiankui Shi, Jiyao Xu, Paulo P. Batista, Jose V. Bageston, Yajun Zhu, Clezio M. Denardini, Chi Wang, Ezequiel Echer, Guotao Yang, Alexandre A. Pimenta, Joaquim R. Costa, Zhengkuan Liu   +21 more
wiley   +1 more source

Potential of quantitative X‐ray imaging from photon‐counting CT: A novel analysis based on effective atomic number and physical density

Journal of Applied Clinical Medical Physics, Volume 27, Issue 7, July 2026.
Abstract Background Conventional CT assessment of lung lesions is based mainly on morphological features. CT values represent relative X‐ray attenuation that does not directly reflect tissue composition and/or physical density. Quantitative imaging using photon‐counting CT (PC‐CT) has the potential to provide quantitative parameters, such as effective ...
Takashi Asahara, Rina Nishigami, Natsumi Kimoto, Mana Mitani, Yusuke Morimitsu, Noriaki Akagi, Fumiyo Higaki, Toshihiro Iguchi, Takao Hiraki, Hiroaki Hayashi   +9 more
wiley   +1 more source

Realistic Kidney Tissue Surrogates for Multienergy Computed Tomography-Feasibility and Estimation of Energy-Dependent Attenuation Thresholds for Renal Lesion Enhancement in Low-kV and Virtual Monoenergetic Imaging

, 2021
PURPOSE The aims of this study were to assess if kidney tissue surrogates (KTSs) are superior to distilled water-iodine solutions in the emulation of energy-dependent computed tomography (CT) attenuation characteristics of renal parenchyma and to ...
Sartoretti, Thomas, Breiding, Philipe Sebastian, Ghafoor, Soleen, Euler, André, Froehlich, Johannes Malta, Donati, Olivio Fabrizio, Zadory, Matthias   +6 more
core   +1 more source

Photon-Counting Detector CT Virtual Monoengergetic Images for Cochlear Implant Visualization—A Head to Head Comparison to Energy-Integrating Detector CT

Tomography, 2022
Cochlear implants (CIs) are the primary treatment method in patients with profound sensorineural hearing loss. Interpretation of postoperative imaging with conventional energy-integrating detector computed tomography (EID-CT) following CI surgery remains
Stephan Waldeck, Daniel Overhoff, Leona Alizadeh, Benjamin V. Becker, Matthias Port, Matthias F. Froelich, Marc A. Brockmann, Sven Schumann, Thomas J. Vogl, Stefan O. Schoenberg, Sandra Schmidt   +10 more
doaj   +1 more source

Introduction to TREx‐ATM V2.0: A Versatile Model of Auroral Transport and Its Effects in the Ionosphere

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Auroral transport models (ATMs) play an important role in quantitative studies of optical auroras, their driving mechanisms, and their effects on the ionosphere and thermosphere. TREx‐ATM was initially developed as the support model for the Transition Region Explorer (TREx) mission, and has gained increasing applications in the community in ...
Jun Liang, E. Donovan, E. Spanswick, C. Gabrielse, D. Chaddock, J. Houghton   +5 more
wiley   +1 more source

Dual-Energy CT in Oncologic Imaging

Tomography
Dual-energy CT (DECT) is an innovative technology that is increasingly widespread in clinical practice. DECT allows for tissue characterization beyond that of conventional CT as imaging is performed using different energy spectra that can help ...
Giovanni Foti, Giorgio Ascenti, Andrea Agostini, Chiara Longo, Fabio Lombardo, Alessandro Inno, Alessandra Modena, Stefania Gori   +7 more
doaj   +1 more source

Imaging of intracranial hemorrhage in photon counting computed tomography using virtual monoenergetic images

Neuroradiology
Abstract Purpose To determine the optimal virtual monoenergetic image (VMI) for detecting and assessing intracranial hemorrhage in unenhanced photon counting CT of the head based on the evaluation of quantitative and qualitative image quality parameters.
Denise Schoenbeck, Alexander Sacha, Julius Henning Niehoff, Christoph Moenninghoff, Jan Borggrefe, Sebastian Horstmeier, Alexey Surov, Iram Shahzadi, Ulrich Knappe, Jan Robert Kroeger, Arwed Elias Michael   +10 more
openaire   +3 more sources

Comparison of Low‐Iodine Concentration Quantification Accuracy and Contrast‐To‐Noise Ratio Across Three Dual‐Energy CT Techniques: A Phantom Study

Journal of Medical Radiation Sciences, Volume 73, Issue 2, Page 224-232, June 2026.
Using a clinical abdominal CT protocol, all three DECT techniques accurately quantified iodine. Rapid kV‐switching achieved the lowest detectable and quantifiable iodine concentrations, while dual‐layer DECT provided the highest normalised contrast‐to‐noise ratio on 40‐keV virtual monoenergetic images.
Chonsitron Sirituenlee, Sirapasson Kraison, Paweena Wongpan, Pawitiya Supawarapong, Teeraphat Pataraphitakpong, Supannika Kawvised, Samrit Kittipayak, Monchai Phonlakrai   +7 more
wiley   +1 more source

Advancing Heliophysics and Space Weather Modeling Through Open Science

Space Weather, Volume 24, Issue 6, June 2026.
Abstract We present a community‐wide effort to develop a strategy and action plan to advance heliophysics and space weather modeling through open science. While open science has the potential to enhance the quality and pace of scientific discovery, its application to scientific modeling requires more careful consideration regarding open data and open ...
C. Corti, M. M. Kuznetsova, M. A. Reiss, J. Yue, J. Karpen, C. N. Arge, F. Bacchini, C. Bard, S. Bruinsma, R. M. Caplan, L. K. S. Daldorff, P. J. Deka, C. R. DeVore, S. Elvidge, N. Ganushkina, J. D. Huba, B. V. Jackson, V. Jordanova, J. A. Linker, H. Liu, J. G. Luhmann, S. Markidis, P. Mayank, V. Merkin, N. Moens, D. Odstrcil, Y. A. Omelchenko, M. Palmroth, S. Poedts, A. J. Ridley, Y. Shou, V. Tenishev, D. R. Themens, G. Toth, W. Wang, R.‐P. Wilhelm, M. A. Young, B. Cecconi, M.‐Y. Chou, D. De Zeeuw, G. L. Delzanno, C. Didigu, M. El Alaoui, S. Fung, J. Green, Z. Huang, L. K. Jian, L. J. Landwer, M. Lesko, P. MacNeice, A. Masson, M. L. Mays, P. M. Mehta, M. S. Miesch, E. Palmerio, M. Petrenko, E. Provornikova, L. Rastätter, L. Rusaitis, N. Sachdeva, E. Samara, D. Sur, A. Taktakishvili, J. Topper, T. Tsui, C. Verbeke, J. Wang, C. Wiegand, M. Wiltberger, Y. Zheng, M. M. Bisi, M. K. Georgoulis, T. Kodikara, T. Pulkkinen, A. Chartier, D. da Silva, A. Faturahman, K. Garcia‐Sage, D. Kondrashov, V. E. Ledvina, W. Liu, C. Pandey, E. Resnick, C. Shi, R. S. Weigel, K. Whitman, I. Zakharenkova, K. Zhang   +87 more
wiley   +1 more source

Refining imaging parameters for dual‐energy cone‐beam computed tomography in image‐guided radiation therapy

Journal of Applied Clinical Medical Physics, Volume 27, Issue 5, May 2026.
Abstract Purpose To develop a dose estimation method for virtual monoenergetic images (VMIs) derived from sequential dual‐energy (DE) cone‐beam computed tomography (CBCT), enhancing image quality while reducing imaging dose. The goal is to generate VMIs with lower imaging dose than standard CBCT for future clinical applications.
Hyejoo Kang, Andrew Keeler, Matthew Georgesen, Jason Luce, Ha Nguyen, Mathias Lehmann, Sebastien Gros, John C. Roeske   +7 more
wiley   +1 more source