Results 51 to 60 of about 1,371,529 (165)

High-contrast, High-angular-resolution Optical Speckle Imaging: Uncovering Hidden Stellar Companions

The Astronomical Journal
We explore the possibility of detecting very faint, very close-in stellar companions using large aperture ground-based telescopes and the technique of optical speckle imaging.
Steve B. Howell, Arturo O. Martinez, Douglas A. Hope, David R. Ciardi, Stuart M. Jefferies, Fabien R. Baron, Michael B. Lund   +6 more
doaj   +1 more source

High resolution and contrast 7 tesla MR brain imaging of the neonate

Frontiers in Radiology
IntroductionUltra-high field MR imaging offers marked gains in signal-to-noise ratio, spatial resolution, and contrast which translate to improved pathological and anatomical sensitivity.
Philippa Bridgen, Philippa Bridgen, Raphael Tomi-Tricot, Raphael Tomi-Tricot, Raphael Tomi-Tricot, Raphael Tomi-Tricot, Alena Uus, Alena Uus, Daniel Cromb, Megan Quirke, Megan Quirke, Jennifer Almalbis, Jennifer Almalbis, Beya Bonse, Beya Bonse, Miguel De la Fuente Botella, Miguel De la Fuente Botella, Alessandra Maggioni, Alessandra Maggioni, Pierluigi Di Cio, Pierluigi Di Cio, Paul Cawley, Paul Cawley, Chiara Casella, Ayse Sila Dokumaci, Alice R. Thomson, Alice R. Thomson, Jucha Willers Moore, Jucha Willers Moore, Devi Bridglal, Joao Saravia, Thomas Finck, Anthony N. Price, Anthony N. Price, Elisabeth Pickles, Elisabeth Pickles, Elisabeth Pickles, Lucilio Cordero-Grande, Lucilio Cordero-Grande, Lucilio Cordero-Grande, Alexia Egloff, Alexia Egloff, Jonathan O’Muircheartaigh, Jonathan O’Muircheartaigh, Jonathan O’Muircheartaigh, Serena J. Counsell, Sharon L. Giles, Sharon L. Giles, Sharon L. Giles, Maria Deprez, Maria Deprez, Enrico De Vita, Enrico De Vita, Enrico De Vita, Enrico De Vita, Mary A. Rutherford, Mary A. Rutherford, Mary A. Rutherford, A. David Edwards, A. David Edwards, A. David Edwards, Joseph V. Hajnal, Joseph V. Hajnal, Joseph V. Hajnal, Shaihan J. Malik, Shaihan J. Malik, Shaihan J. Malik, Tomoki Arichi, Tomoki Arichi, Tomoki Arichi   +69 more
doaj   +1 more source

Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-field Spectroscopy

The Astronomical Journal, 2023
While radial velocity surveys have demonstrated that the population of gas giants peaks around 3 au, the most recent high-contrast imaging surveys have only been sensitive to planets beyond ∼10 au.
Shubh Agrawal, Jean-Baptiste Ruffio, Quinn M. Konopacky, Bruce Macintosh, Dimitri Mawet, Eric L. Nielsen, Kielan K. W. Hoch, Michael C. Liu, Travis S. Barman, William Thompson, Alexandra Z. Greenbaum, Christian Marois, Jenny Patience   +12 more
doaj   +1 more source

Evaluation of spine disorders using high contrast imaging of the cartilaginous endplate

Frontiers in Physiology
Introduction: Many spine disorders are caused by disc degeneration or endplate defects. Because nutrients entering the avascular disc are channeled through the cartilaginous endplate (CEP), structural and compositional changes in the CEP may block this ...
Jiyo S. Athertya, Sheronda Statum, Xiaojun Chen, Kevin Du, Soo Hyun Shin, Saeed Jerban, Christine B. Chung, Christine B. Chung, Eric Y. Chang, Eric Y. Chang, Yajun Ma   +10 more
doaj   +1 more source

Theranostics and contrast agents for magnetic resonance imaging

Biomaterials Research, 2018
Background Magnetic resonance imaging is one of the diagnostic tools that uses magnetic particles as contrast agents. It is noninvasive methodology which provides excellent spatial resolution. Although magnetic resonance imaging offers great temporal and
Yohan Jeong, Hee Sook Hwang, Kun Na
doaj   +1 more source

Inner structure- and surface-controlled hollow MnO nanocubes for high sensitive MR imaging contrast effect

Nano Convergence, 2020
Manganese oxide (MnO) nanocubes were fabricated and their surface were modified by ligand encapsulation or ligand exchange, to render them water-soluble. And then, MnO formed the hollow structure by etching using acidic solution (phthalate buffer, pH 4.0)
Aastha Kukreja, Byunghoon Kang, Seungmin Han, Moo-Kwang Shin, Hye Young Son, Yuna Choi, Eun-Kyung Lim, Yong-Min Huh, Seungjoo Haam   +8 more
doaj   +1 more source

Compact meta-differentiator for achieving isotropically high-contrast ultrasonic imaging

Nature Communications
Ultrasonic imaging is crucial in the fields of biomedical engineering for its deep penetration capabilities and non-ionizing nature. However, traditional techniques heavily rely on impedance differences within objects, resulting in poor contrast when ...
Yurou Jia, Suying Zhang, Xuan Zhang, Houyou Long, Caibin Xu, Yechao Bai, Ying Cheng, Dajian Wu, Mingxi Deng, Cheng-Wei Qiu, Xiaojun Liu   +10 more
doaj   +1 more source

Interferometric wavefront sensors for high contrast imaging

Optics Express, 2006
Several novel interferometer configurations are presented which have a high signal-to-noise ratio making them suitable for high contrast imaging. High contrast imaging instruments, such as required to directly observe extrasolar planets, will require adaptive optics systems capable of reducing the atmospherically induced phase aberrations to a few nm ...
openaire   +2 more sources

High Relaxivity Contrast Agents for MRI and Molecular Imaging

, 2006
Gd(III) chelates have played an important role in the development of clinical applications of MRI technique by adding relevant physiological information to the superb anatomical resolution attainable with this imaging modality.
S. AIME, A. BARGE, E. GIANOLIO, R. PAGLIARIN, L. SILENGO, TEI, LORENZO   +5 more
openaire   +4 more sources

High-frequency ultrasound for microcirculation in metastatic mouse lymph node: contrast-free versus contrast-enhanced imaging

Scientific Reports
Focal defects are one of the important features for the diagnosis of lymph node (LN) metastasis. In our previous study, an accurate method for detecting contrast agents was proposed.
Kazuki Maeda, Masaaki Omura, Ariunbuyan Sukhbaatar, Tsuyoshi Sugiura, Tetsuya Kodama   +4 more
doaj   +1 more source