Results 41 to 50 of about 6,769 (235)

Nonlinear two-dimensional terahertz photon echo and rotational spectroscopy in the gas phase [PDF]

, 2016
Ultrafast two-dimensional spectroscopy utilizes correlated multiple light-matter interactions for retrieving dynamic features that may otherwise be hidden under the linear spectrum.
Fleischer, Sharly, Hwang, Harold Y., Lu, Jian, Nelson, Keith A., Ofori-Okai, Benjamin K., Zhang, Yaqing   +5 more
core   +2 more sources

An Update in Qualitative Imaging of Bone Using Ultrashort Echo Time Magnetic Resonance

Frontiers in Endocrinology, 2020
Bone is comprised of mineral, collagenous organic matrix, and water. X-ray-based techniques are the standard approach for bone evaluation in clinics, but they are unable to detect the organic matrix and water components in bone.
Saeed Jerban, Douglas G. Chang, Yajun Ma, Hyungseok Jang, Eric Y. Chang, Eric Y. Chang, Jiang Du   +6 more
doaj   +1 more source

Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers [PDF]

, 2015
We present a setup for complete characterization of femtosecond pulses generated by seeded free-electron lasers (FEL's) in the extreme-ultraviolet spectral region.
Dacasa, Hugo, De Ninno, Giovanni, Garzella, David, Gauthier, David, Lozano, Magali, Mahieu, Benoît, Merdji, Hamed, Rousseau, Jean-Philippe, Zeitoun, Philippe   +8 more
core   +3 more sources

High-Contrast Lumbar Spinal Bone Imaging Using a 3D Slab-Selective UTE Sequence

Frontiers in Endocrinology, 2022
Ultra-short echo time (UTE) MRI with post-processing is a promising technique in bone imaging that produces a similar contrast to computed tomography (CT).
Amir Masoud Afsahi, Alecio F. Lombardi, Alecio F. Lombardi, Zhao Wei, Michael Carl, Jiyo Athertya, Koichi Masuda, Mark Wallace, Roland R. Lee, Roland R. Lee, Ya-Jun Ma   +10 more
doaj   +1 more source

Ultrashort echo time magnetization transfer (UTE‐MT) imaging of cortical bone [PDF]

NMR in Biomedicine, 2015
Magnetization transfer (MT) imaging is one way to indirectly assess pools of protons with fast transverse relaxation. However, conventional MT imaging sequences are not applicable to short T2 tissues such as cortical bone. Ultrashort echo time (UTE) sequences with TE values as low as 8 µs can detect signals from different water components in cortical ...
Chang, EY, Bae, WC, Shao, H, Biswas, R, Li, S, Chen, J, Patil, S, Healey, R, D'Lima, DD, Chung, CB, Du, J   +10 more
openaire   +5 more sources

Spectral phase conjugation via extended phase matching [PDF]

, 2005
It is shown that the copropagating three-wave-mixing parametric process, with appropriate type-II extended phase matching and pumped with a short second-harmonic pulse, can perform spectral phase conjugation and parametric amplification, which shows a ...
Tsang, Mankei
core   +3 more sources

Rapid dual‐RF, dual‐echo, 3D ultrashort echo time craniofacial imaging: A feasibility study [PDF]

Magnetic Resonance in Medicine, 2018
PurposeTo develop a dual‐radiofrequency (RF), dual‐echo, 3D ultrashort echo‐time (UTE) pulse sequence and bone‐selective image reconstruction for rapid high‐resolution craniofacial MRI.MethodsThe proposed pulse sequence builds on recently introduced dual‐RF UTE imaging. While yielding enhanced bone specificity by exploiting high sensitivity of short T2
Hyunyeol, Lee, Xia, Zhao, Hee Kwon, Song, Rosaline, Zhang, Scott P, Bartlett, Felix W, Wehrli   +5 more
openaire   +2 more sources

AASLD practice guidance on drug, herbal, and dietary supplement–induced liver injury

, 2022
Hepatology, EarlyView.
Robert J. Fontana, Iris Liou, Adrian Reuben, Ayako Suzuki, M. Isabel Fiel, William Lee, Victor Navarro   +6 more
wiley   +1 more source

Photon echoes of molecular photoassociation

, 2004
Revivals of optical coherence of molecular photoassociation driven by two ultrashort laser pulses are addressed in the Condon approach. Based on textbook examples and numerical simulation of KrF excimer molecules, a prediction is made about an existence ...
Dykhne, Alexander M., Rudavets, Alexander G.   +1 more
core   +1 more source

MRI-based porosity index (PI) and suppression ratio (SR) in the tibial cortex show significant differences between normal, osteopenic, and osteoporotic female subjects

Frontiers in Endocrinology, 2023
IntroductionUltrashort echo time (UTE) MRI enables quantitative assessment of cortical bone. The signal ratio in dual-echo UTE imaging, known as porosity index (PI), as well as the signal ratio between UTE and inversion recovery UTE (IR-UTE) imaging ...
Saeed Jerban, Saeed Jerban, Saeed Jerban, Yajun Ma, Yajun Ma, Dina Moazamian, Jiyo Athertya, Sophia Dwek, Hyungseok Jang, Hyungseok Jang, Gina Woods, Christine B. Chung, Christine B. Chung, Eric Y. Chang, Eric Y. Chang, Jiang Du, Jiang Du   +16 more
doaj   +1 more source