Results 91 to 100 of about 6,769 (235)

Attenuation correction for brain PET imaging using deep neural network based on dixon and ZTE MR images

, 2018
Positron Emission Tomography (PET) is a functional imaging modality widely used in neuroscience studies. To obtain meaningful quantitative results from PET images, attenuation correction is necessary during image reconstruction. For PET/MR hybrid systems,
Fakhri, Georges El, Gong, Kuang, Kim, Kyungsang, Li, Quanzheng, Seo, Youngho, Yang, Jaewon   +5 more
core   +1 more source

Ultrafast Transitions in X‐Ray Irradiated Solids

Contributions to Plasma Physics, EarlyView.
ABSTRACT In this review, we present current developments on modeling ultrafast transitions in solids triggered by intense, atto‐ to femtosecond pulses from X‐ray free electron lasers. This specific irradiation regime requires dedicated simulation tools based on theoretical and computational methods, involving the elements of classical and quantum ...
Sebastião Antunes, Konrad J. Kapcia, Vladimir Lipp, Beata Ziaja   +3 more
wiley   +1 more source

Ultrashort Echo-Time MRI for the Assessment of Tracheomalacia in Neonates

Chest, 2020
Bronchoscopy is the gold standard for evaluating tracheomalacia; however, reliance on an invasive procedure limits understanding of normal airway dynamics. Self-gated ultrashort echo-time MRI (UTE MRI) can assess tracheal dynamics but has not been rigorously evaluated.This study was a validation of UTE MRI diagnosis of tracheomalacia in neonates using ...
Erik B, Hysinger, Alister J, Bates, Nara S, Higano, Dan, Benscoter, Robert J, Fleck, Catherine K, Hart, Gregory, Burg, Alessandro, De Alarcon, Paul S, Kingma, Jason C, Woods   +9 more
openaire   +3 more sources

Enhanced Nonlinear Optical Absorption Properties and Carrier Dynamics of Violet Phosphorene by Oxidation for Ultrafast Photonic Applications

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
This study investigates the effects of oxidation treatment on the nonlinear optical absorption properties and carrier dynamics of two‐dimensional violet phosphorene (VP), elucidating the underlying physical mechanisms. Furthermore, ultrashort laser pulses are achieved utilizing the enhanced saturation absorption and shortened carrier relaxation ...
Bo Li, Han Pan, Qingling Tang, Zhongben Pan, Hongwei Chu, Ying Li, Dechun Li   +6 more
wiley   +1 more source

Confined Hot Carrier Cooling Via Excited‐State Energy Gap Engineering in Graphyne Carbon Allotropes

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
The excited‐state energy gap (EEG), regulated by the concentration of sp‐hybridized carbon, provides an effective handle for tuning electron–phonon coupling behavior. This design enables long‐lived confinement of hot carriers near the top of the EEG with controllable energy levels.
Fulong Dai, Zhaozhao Xiong, Yingcong Liu, Feiyu Cheng, Haochun Sun, Zhenfa Zheng, Jin Zhao, Zhuojian Liang, Zhuo Kang, Yue Zhang   +9 more
wiley   +1 more source

ULTRASHORT TIME ECHO MRI SEQUENCE TO QUANTIFY VERTEBRAL BONE MORPHOLOGY IN YOUNG ADULTS

Current Directions in Biomedical Engineering
While MRI is the modality of choice for soft tissue imaging, its ability to visualize bone structures remains limited. In contrast, CT provides superior bone imaging but involves ionizing radiation, making it suboptimal for longitudinal studies in ...
Conticello Salvatore, Jung Bernd, Dozio Scilla, Beutler-Minth Verena, Bähler Philippe, Schmid Stefan, Büchler Philippe   +6 more
doaj   +1 more source

Quantitative Ultrashort Echo Time Magnetic Resonance Imaging: Perfusion [PDF]

, 2023
Zeng, Chun, Du, Jiang, Athertya, Jiyo, Bydder, Graeme M   +3 more
openaire   +2 more sources

Sizing and concentration analysis of cfDNA using Biabooster technology: Results from a prospective plasma‐based collection of 77 patients with locally advanced unresectable esophageal cancer

International Journal of Cancer, EarlyView.
What's New? This study introduces a novel approach for detecting locally advanced esophageal carcinoma using cell‐free DNA (cfDNA) analysis through a highly sensitive fragmentome assay. Unlike traditional sequencing‐based methods that are limited by the absence of specific mutations in esophageal tumors, our method offers an alternative by quantifying ...
Anouchka Modesto, Sophie Gibert, Caroline Delmas, David Tougeron, Amaury Paumier, Alexandre Taillez, Samuel Le Sourd, Delphine Argo Leignel, Philippe Ronchin, Ariane Darut Jouve, Véronique Vendrely, Olivier Riou, Jérôme Martin‐Babau, Thomas Leroy, Laurent Quéro, Naïma Hanoun, Pierre Cordelier, Veronica Pezzella, Jean Pierre Delord, Rosine Guimbaud, Elizabeth Moyal, Catherine Seva   +21 more
wiley   +1 more source

A pilot study of short T2* measurements with ultrashort echo time imaging at 0.35 T

BioMedical Engineering OnLine, 2018
Purpose Ultrashort echo time (UTE) sequences play a key role in imaging and quantifying short T2 species. However, almost all of the relevant studies was conducted at relatively high fields. The purpose of this work was to further explore the feasibility
Xiuyuan Chen, Bensheng Qiu
doaj   +1 more source

Ultrashort Echo Time Imaging of Phosphorus in Man

, 2012
The 31P nucleus is NMR-visible and exists throughout the human body. The MRI/MRS community has principally focused on the 31P in the high-energy metabolites, which have relatively long T2s. However, using short echo time (TE) methods, it is possible to obtain signal from the short P that is present in the hydroxyapatite of the bone matrix. This article
openaire   +1 more source