The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hyle B Park - One of the best experts on this subject based on the ideXlab platform.
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
New Phytologist, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema. © The Authors. Published by SPIE under a
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
Neurophotonics, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Jenny I Szu, Mike S Hsu, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema.
Lawrence Musanje - One of the best experts on this subject based on the ideXlab platform.
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curing Light Attenuation in filled resin restorative materials
Dental Materials, 2006Co-Authors: Lawrence MusanjeAbstract:Abstract Objective To characterize the Attenuation of the curing Light in filled resin restorative materials (FRRMs) to aid understanding of curing depth. Materials and methods One hundred and eighty materials of various shades from several manufacturers were tested in various ways. One set (66 materials) was used to determine the applicability of Lambert's Law using a quartz-tungsten-halogen curing Light (Optilux 400, Demetron Research) by measuring the transmitted Light with a dental radiometer (Cure Rite, EFOS) for successive thicknesses of ground 10 mm diameter specimens from 3 to 0.5 mm in 0.5 mm steps. A second set (17 materials) were similarly tested with separate specimens from 1 to 5 mm in thickness using a transmission densitometer (DT1405, RY Parry) fitted with a curing-Light dichroic filter. For a third (overlapping) set (165 materials), the 1 mm pure (reflectance-free) optical density ( D 1 value) was determined from two specimens, ∼1 and ∼2 mm thick using the densitometer as above. From D 1 the critical thickness ( x CRIT ), identified as depth of cure (DoC) for an excess surface exposure factor of 2, was calculated. Results Lambert's Law was found to hold with no evidence of appreciable differential absorption effects. Attenuation coefficient and D 1 were significantly correlated ( P −13 ). D 1 varied between about 0.23 and 0.72, for corresponding x CRIT values of 1.3 and 0.4 mm. There was no correlation between D 1 and reflectance ( P > 0.09), and no systematic effect due to shade letter, but a highly significant ( P −8 ), but weak (−0.066 mm/unit), correlation between shade number and D 1 . Significance Depth of cure can be calculated directly from the D 1 value determined via simple optical density measurements on two specimens providing that (a) an irradiation time can be determined for the surface of a specimen to be “sufficiently” cured (i.e. for DoC = 0 precisely), and (b) an excess internal surface exposure ratio can be chosen such that the corresponding DoC is attained in a practicable irradiation time.
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curing Light Attenuation in filled resin restorative materials
Dental Materials, 2006Co-Authors: Lawrence Musanje, Brian W. DarvellAbstract:Abstract Objective To characterize the Attenuation of the curing Light in filled resin restorative materials (FRRMs) to aid understanding of curing depth. Materials and methods One hundred and eighty materials of various shades from several manufacturers were tested in various ways. One set (66 materials) was used to determine the applicability of Lambert's Law using a quartz-tungsten-halogen curing Light (Optilux 400, Demetron Research) by measuring the transmitted Light with a dental radiometer (Cure Rite, EFOS) for successive thicknesses of ground 10 mm diameter specimens from 3 to 0.5 mm in 0.5 mm steps. A second set (17 materials) were similarly tested with separate specimens from 1 to 5 mm in thickness using a transmission densitometer (DT1405, RY Parry) fitted with a curing-Light dichroic filter. For a third (overlapping) set (165 materials), the 1 mm pure (reflectance-free) optical density ( D 1 value) was determined from two specimens, ∼1 and ∼2 mm thick using the densitometer as above. From D 1 the critical thickness ( x CRIT ), identified as depth of cure (DoC) for an excess surface exposure factor of 2, was calculated. Results Lambert's Law was found to hold with no evidence of appreciable differential absorption effects. Attenuation coefficient and D 1 were significantly correlated ( P −13 ). D 1 varied between about 0.23 and 0.72, for corresponding x CRIT values of 1.3 and 0.4 mm. There was no correlation between D 1 and reflectance ( P > 0.09), and no systematic effect due to shade letter, but a highly significant ( P −8 ), but weak (−0.066 mm/unit), correlation between shade number and D 1 . Significance Depth of cure can be calculated directly from the D 1 value determined via simple optical density measurements on two specimens providing that (a) an irradiation time can be determined for the surface of a specimen to be “sufficiently” cured (i.e. for DoC = 0 precisely), and (b) an excess internal surface exposure ratio can be chosen such that the corresponding DoC is attained in a practicable irradiation time.
Carissa L Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
New Phytologist, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema. © The Authors. Published by SPIE under a
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
Neurophotonics, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Jenny I Szu, Mike S Hsu, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema.
Yan Wang - One of the best experts on this subject based on the ideXlab platform.
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a rapid scene depth estimation model based on underwater Light Attenuation prior for underwater image restoration
Pacific Rim Conference on Multimedia, 2018Co-Authors: Wei Song, Yan Wang, Dongmei Huang, Dian TjondronegoroAbstract:Underwater images present blur and color cast, caused by Light absorption and scattering in water medium. To restore underwater images through image formation model (IFM), the scene depth map is very important for the estimation of the transmission map and background Light intensity. In this paper, we propose a rapid and effective scene depth estimation model based on underwater Light Attenuation prior (ULAP) for underwater images and train the model coefficients with learning-based supervised linear regression. With the correct depth map, the background Light (BL) and transmission maps (TMs) for R-G-B Light are easily estimated to recover the true scene radiance under the water. In order to evaluate the superiority of underwater image restoration using our estimated depth map, three assessment metrics demonstrate that our proposed method can enhance perceptual effect with less running time, compared to four state-of-the-art image restoration methods.
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
New Phytologist, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema. © The Authors. Published by SPIE under a
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
Neurophotonics, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Jenny I Szu, Mike S Hsu, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema.
Devin K Binder - One of the best experts on this subject based on the ideXlab platform.
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
New Phytologist, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema. © The Authors. Published by SPIE under a
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decreased Light Attenuation in cerebral cortex during cerebral edema detected using optical coherence tomography
Neurophotonics, 2014Co-Authors: Carissa L Rodriguez, Melissa M Eberle, Devin K Binder, Yan Wang, Jenny I Szu, Mike S Hsu, Hyle B ParkAbstract:Cerebral edema develops in response to a variety of conditions, including traumatic brain injury and stroke, and contributes to the poor prognosis associated with these injuries. This study examines the use of optical coherence tomography (OCT) for detecting cerebral edema in vivo. Three-dimensional imaging of an in vivo water intoxication model in mice was performed using a spectral-domain OCT system centered at 1300 nm. The change in Attenuation coefficient was calculated and cerebral blood flow was analyzed using Doppler OCT techniques. We found that the average Attenuation coefficient in the cerebral cortex decreased over time as edema progressed. The initial decrease began within minutes of inducing cerebral edema and a maximum decrease of 8% was observed by the end of the experiment. Additionally, cerebral blood flow slowed during late-stage edema. Analysis of local regions revealed the same trend at various locations in the brain, consistent with the global nature of the cerebral edema model used in this study. These results demonstrate that OCT is capable of detecting in vivo optical changes occurring due to cerebral edema and highLights the potential of OCT for precise spatiotemporal detection of cerebral edema.