Results 11 to 20 of about 65,394 (259)

Anti-scatter grid artifact elimination for high-resolution x-ray imaging detectors without a prior scatter distribution profile [PDF]

Medical Imaging 2018: Physics of Medical Imaging, 2018
Using anti-scatter grids with high-resolution imaging detectors could result in grid-line artifacts, with increasing severity as detector resolution improves. Grid-line mask subtraction can result in residual artifacts that are due to residual scatter penetrating the grid and not subtracted.
S V Setlur, Nagesh, R, Rana, D R, Bednarek, S, Rudin   +3 more
exaly   +7 more sources

Halo artifacts of indwelling urinary catheter by inaccurate scatter correction in 18F-FDG PET/CT imaging: incidence, mechanism, and solutions

EJNMMI Physics, 2020
Background Halo artifacts from urinary catheters can occur due to inaccurate scatter correction, and the artifacts affect the tumor visibility in 18F-FDG PET/CT images. We investigated the incidence rate and the mechanisms of halo-artifact generation and
Keiichi Magota, Naoto Numata, Daiki Shinyama, Junya Katahata, Yamato Munakata, Piotr J. Maniawski, Kentaro Kobayashi, Osamu Manabe, Kenji Hirata, Ukihide Tateishi, Kohsuke Kudo, Tohru Shiga   +11 more
doaj   +1 more source

A model‐based scatter artifacts correction for cone beam CT [PDF]

Medical Physics, 2016
Purpose:Due to the increased axial coverage of multislice computed tomography (CT) and the introduction of flat detectors, the size of x‐ray illumination fields has grown dramatically, causing an increase in scatter radiation. For CT imaging, scatter is a significant issue that introduces shading artifact, streaks, as well as reduced contrast and ...
Zhao, Wei, Vernekohl, Don, Zhu, Jun, Wang, Luyao, Xing, Lei   +4 more
openaire   +3 more sources

Evaluation and Comparison of MODIS C6 and C6.1 Deep Blue Aerosol Products in Arid and Semi-Arid Areas of Northwestern China

Remote Sensing, 2022
The Moderate Resolution Imaging Spectroradiometer (MODIS) Deep Blue (DB) algorithm was developed for aerosol retrieval on bright surfaces. Although the global validation accuracy of the DB product is satisfactory, there are still some regions found to ...
Leiku Yang, Xinyao Tian, Chao Liu, Weiqian Ji, Yu Zheng, Huan Liu, Xiaofeng Lu, Huizheng Che   +7 more
doaj   +1 more source

Distance Dependence in the Solar Neighborhood Age-Metallicity Relation [PDF]

, 1999
The age-metallicity relation for F and G dwarf stars in the solar neighborhood, based on the stellar metallicity data of Edvardsson et al. (1993), shows an apparent scatter that is larger than expected considering the uncertainties in metallicities and ...
Bertelli G., D. R. Garnett, Edvardsson B., Favata F., Francois P., H. A. Kobulnicky, Ng Y. K., Pilyugin L., Roy J.-R., van den Hoek L. B., Wielen R.   +10 more
core   +2 more sources

A patch-based CBCT scatter artifact correction using prior CT [PDF]

SPIE Proceedings, 2017
We have developed a novel patch-based cone beam CT (CBCT) artifact correction method based on prior CT images. First, we used the image registration to align the planning CT with the CBCT to reduce the geometry difference between the two images. Then, we brought the planning CT-based prior information into the Bayesian deconvolution framework to ...
Xiaofeng, Yang, Tian, Liu, Xue, Dong, Xiangyang, Tang, Eric, Elder, Walter J, Curran, Anees, Dhabaan   +6 more
openaire   +2 more sources

The colour magnitude relation for galaxies in the Coma cluster [PDF]

, 2001
We present a new photometric catalogue of the Coma galaxy cluster in the Johnson U- and V- bands. We cover an area of 3360arcmin2 of sky, to a depth of V=20 mag in a 13 arcsec diameter aperture, and produce magnitudes for ~1400 extended objects in metric
A.I. Terlevich, Abraham, Andreon, Andreon, Arimoto, Baier, Beers, Bender, Bertin, Bothun, Bower, Bower, Bower, Caldwell, Caldwell, Charlot, Colless, Djorgovski, Dressler, Dressler, Dressler, Dressler, Ellis, Escalera, Faber, Ferguson, Fried, Frogel, Godwin, Johnson, Jorgensen, Kauffmann, Kodama, Kodama, Kodama, Kuntschner, Landolt, Larson, Larson, Lucey, Maddox, Mehlert, Moss, N. Caldwell, Pahre, Persson, Poggianti, R.G. Bower, Saglia, Saglia, Secker, Stanford, Terlevich, Vader, Van Den Bergh, Visvanathan, Woolf, Worthey, Zepf   +58 more
core   +3 more sources

Global and long-term comparison of SCIAMACHY limb ozone profiles with correlative satellite data (2002–2008) [PDF]

Atmospheric Measurement Techniques, 2012
SCIAMACHY limb scatter ozone profiles from 2002 to 2008 have been compared with MLS (2005–2008), SABER (2002–2008), SAGE II (2002–2005), HALOE (2002–2005) and ACE-FTS (2004–2008) measurements.
S. Mieruch, M. Weber, C. von Savigny, A. Rozanov, H. Bovensmann, J. P. Burrows, P. F. Bernath, C. D. Boone, L. Froidevaux, L. L. Gordley, M. G. Mlynczak, J. M. Russell III, L. W. Thomason, K. A. Walker, J. M. Zawodny   +14 more
doaj   +1 more source

Evaluation of Motion Artifact Metrics for Coronary CT Angiography [PDF]

, 2018
Purpose This study quantified the performance of coronary artery motion artifact metrics relative to human observer ratings. Motion artifact metrics have been used as part of motion correction and best‐phase selection algorithms for Coronary Computed ...
Contijoch, Desjardins, Gaemperli, Hollander, Husmann, Johnson, Kendall, Kim, Kyriakou, Manzke, Mowatt, Parzen, Phelps, Plank, Rohkohl, Stassi, Tang, Vembar, Warfield, Wick   +19 more
core   +2 more sources

A rare case of retained sabot after close-range shotgun injury

Surgical Case Reports, 2021
Background Shotgun injuries are a relatively uncommon type of trauma, and therefore may present a challenge in management for trauma surgeons. This is particularly true in the case of surgeons unfamiliar with the unique characteristics of shotgun wounds ...
J. Alford Flippin, Sami Kishawi, Hannah Braunstein, Alaina M. Lasinski   +3 more
doaj   +1 more source