Results 31 to 40 of about 1,054,818 (327)

Contrast‐to‐noise ratio (CNR) as a quality parameter in fMRI [PDF]

Journal of Magnetic Resonance Imaging, 2007
AbstractPurposeTo evaluate the impact of data quality on the localization of brain activation in functional magnetic resonance imaging (fMRI) and to explore whether the temporal contrast‐to‐noise‐ratio (CNR) provides a quantitative parameter to estimate fMRI quality.Materials and MethodsWe investigated two methods for defining the CNR by comparing them
Geissler, Alexander, Gartus, Andreas, Foki, Thomas, Tahamtan, Amir Reza, Beisteiner, Roland, Barth, Markus   +5 more
openaire   +3 more sources

Contrast-to-noise ratio comparison between X-ray fluorescence emission tomography and computed tomography. [PDF]

J Med Imaging (Bellingham)
We provide a comparison of X-ray fluorescence emission tomography (XFET) and computed tomography (CT) for detecting low concentrations of gold nanoparticles (GNPs) in soft tissue and characterize the conditions under which XFET outperforms energy-integrating CT (EICT) and photon-counting CT (PCCT).We compared dose-matched Monte Carlo XFET simulations ...
DeBrosse H, Jadick G, Meng LJ, La Rivière P.   +3 more
europepmc   +3 more sources

Noise Properties of Superconducting Coplanar Waveguide Microwave Resonators [PDF]

, 2007
We have measured noise in thin-film superconducting coplanar waveguide resonators. This noise appears entirely as phase noise, equivalent to a jitter of the resonance frequency.
Benjamin A. Mazin, Henry G. LeDuc, Jiansong Gao, Jonas Zmuidzinas, Peter K. Day, Wilhelm F. K.   +5 more
core   +2 more sources

Length summation in noise [PDF]

, 2019
To investigate the effect of background noise on visual summation, we measured the contrast detection thresholds for targets with or without a white noise mask in luminance contrast. The targets were Gabor patterns placed at 3° eccentricity to either the
Chen, C-C., Tyler, C. W., Yeh, Y-H. C.
core   +1 more source

Appearance of fractional charge in the noise of non-chiral Luttinger liquids [PDF]

, 2004
The current noise of a voltage biased interacting quantum wire adiabatically connected to metallic leads is computed in presence of an impurity in the wire.
Dolcini, F., Grabert, H., Safi, I., Trauzettel, B.   +3 more
core   +2 more sources

A study on correlation between thyroid CT radiation dose, image quality and female body composition [PDF]

Zhongguo aizheng zazhi
Background and purpose: With the increasing use of medical imaging examinations, Computed tomography (CT) scans have become one of the primary sources of effective dose.
SHEN Xigang, LIN Chengxiang, PENG Weijun, GU Yajia
doaj   +1 more source

Enhancement of microvessel in laser speckle image using gaussian kernel template [PDF]

Journal of Innovative Optical Health Sciences, 2019
Laser speckle contrast imaging (LSCI) is an optical imaging method, which can monitor microvascular flow variation directly without addition of any ectogenous dye.
Yameng Zhang, Yuemei Zhao, Weitao Li, Zhiyu Qian, Lidong Xing   +4 more
doaj   +1 more source

Abbreviated Cardiac MRI Protocol with Post-contrast Cine SSFP: Reproducibility, Contrast-to-noise Ratio, and Energy Savings

Journal of Cardiovascular Magnetic Resonance
Fadi Ibrahim, MD, BSc, Farah Cadour, MD, MSc, Dinesh Thavendiranathan, MD, Bradley Allen, MD, MSc, FSCMR, Kate Hanneman, MD, MPH   +4 more
doaj   +2 more sources

Photo--assisted current and shot noise in the fractional quantum Hall effect [PDF]

, 2003
The effect of an AC perturbation on the shot noise of a fractional quantum Hall fluid is studied both in the weak and the strong backscattering regimes. It is known that the zero-frequency current is linear in the bias voltage, while the noise derivative
A. Crépieux, A. Kumar, A.A. Kozhevnikov, Adeline Crépieux, C. Bruder, C. de C. Chamon, C. de C. Chamon, C. de C. Chamon, C.L. Kane, C.L. Kane, C.L. Kane, C.W.J. Beenakker, D. Feldman, G. Cuniberti, G. Platero, G.B. Lesovik, G.B. Lesovik, G.B. Lesovik, G.B. Lesovik, H.H. Lin, I. Safi, J. Torrès, K.I. Imura, K.I. Imura, L. Saminadayar, L.H. Reydellet, L.P. Kouwenhoven, L.P. Kouwenhoven, M. Büttiker, M. Büttiker, M. Büttiker, M. Reznikov, M. Sassetti, M.H. Pedersen, P. Fendley, Pierre Devillard, R. Aguado, R. de-Picciotto, R.J. Schoelkopf, R.J. Schoelkopf, S.R. Yang, T. Martin, T. Martin, T. Martin, T. Martin, T.H. Oosterkamp, Thierry Martin, V. Rodriguez, V.V. Ponomarenko, X. Jehl, X.G. Wen, X.G. Wen, Y. Gavish, Y. Gavish, Y. Levinson, Y. Oreg   +55 more
core   +9 more sources

Improving the Contrast of Pseudothermal Ghost Images Based on the Measured Signal Distribution of Speckle Fields

Applied Sciences, 2021
In this study, we examine the quality of microscale ghost images as a function of the measured histographic signal distribution of the speckle fields from a nonuniform pseudothermal light source.
Zhe Sun, Frederik Tuitje, Christian Spielmann   +2 more
doaj   +1 more source