The Experts below are selected from a list of 258564 Experts worldwide ranked by ideXlab platform
Namsik Chung - One of the best experts on this subject based on the ideXlab platform.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Namsik ChungAbstract:Background— The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Doppler echocardiography–based MR quantification has well-documented limitations. Methods and Results— We consecutively enrolled 221 patients with MR. Adequate image quality was obtained by 2D- and 3D-color Doppler echocardiography in 211 (95.5%) patients. The quantitative differences between the MR volumes obtained by 2D- and 3D-proximal isovelocity surface area (PISA) were analyzed in various MR subgroups. In the validation cohort (n=52), MR volume obtained by 3D-PISA showed a better agreement with phase-contrast cardiac MRI than 2D-PISA ( r =0.97 versus 0.84). In all 211 patients, 2D-PISA underestimated the MR volume when compared with 3D-PISA (52.4±19.6 versus 59.5±25.6 mL; P =0.005). A total of 33.3% with severe MR based on 3D-PISA were incorrectly assessed by 2D-PISA as having nonsevere MR. In the subgroup analysis, the MR severity (odds ratio, 6.96; 95% confidence interval, 3.04–15.94; P 15 mL) between 2D- and 3D-PISA methods. Conclusions— Quantification of MR by 3D-PISA method is clinically feasible and more accurate than the current 2D-PISA method. MR quantification by 2D-PISA significantly underestimated MR volume with severe, eccentric MR with an asymmetrical orifice. This article demonstrates that 3D-color Doppler echocardiography could be used as a valuable tool to confirm treatment strategy in patients with significant MR.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Ran Heo, In Jeong Cho, Namsik ChungAbstract:Background—The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Dop...
Jaehuk Choi - One of the best experts on this subject based on the ideXlab platform.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Namsik ChungAbstract:Background— The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Doppler echocardiography–based MR quantification has well-documented limitations. Methods and Results— We consecutively enrolled 221 patients with MR. Adequate image quality was obtained by 2D- and 3D-color Doppler echocardiography in 211 (95.5%) patients. The quantitative differences between the MR volumes obtained by 2D- and 3D-proximal isovelocity surface area (PISA) were analyzed in various MR subgroups. In the validation cohort (n=52), MR volume obtained by 3D-PISA showed a better agreement with phase-contrast cardiac MRI than 2D-PISA ( r =0.97 versus 0.84). In all 211 patients, 2D-PISA underestimated the MR volume when compared with 3D-PISA (52.4±19.6 versus 59.5±25.6 mL; P =0.005). A total of 33.3% with severe MR based on 3D-PISA were incorrectly assessed by 2D-PISA as having nonsevere MR. In the subgroup analysis, the MR severity (odds ratio, 6.96; 95% confidence interval, 3.04–15.94; P 15 mL) between 2D- and 3D-PISA methods. Conclusions— Quantification of MR by 3D-PISA method is clinically feasible and more accurate than the current 2D-PISA method. MR quantification by 2D-PISA significantly underestimated MR volume with severe, eccentric MR with an asymmetrical orifice. This article demonstrates that 3D-color Doppler echocardiography could be used as a valuable tool to confirm treatment strategy in patients with significant MR.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Ran Heo, In Jeong Cho, Namsik ChungAbstract:Background—The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Dop...
Gilles Rousselier - One of the best experts on this subject based on the ideXlab platform.
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Modeling of large strain multi-axial deformation of anisotropic metal sheets with strength-Differential Effect using a Reduced Texture Methodology
International Journal of Plasticity, 2014Co-Authors: Gilles RousselierAbstract:This paper works on the macroscopic modeling of the anisotropic plasticity of a 6260-T6 thin-walled aluminum extrusion with a focus on the large strain multi-axial deformation with Strength-Differential Effect (SDE). Based on the framework of the self-consistent polycrystalline plasticity, the recently developed Reduced Texture Methodology (RTM) (Rousselier et al., 2012) is employed to provide the computational efficiency needed for industrial applications while keeping the physically-based nature of the plasticity model. In particular, the new model features a novel hardening law at slip-system level to better capture large strain behaviors, as well as a generic method designed to describe the stress/strain history Effect. All model parameters (including texture) are identified from mechanical experiments using a special optimization procedure. An extensive experimental program covering more than 30 distinct multi-axial stress states with both proportional and non-proportional loadings is used to calibrate and validate the present model. Both full- and reduced-thickness specimens are tested to capture the through-thickness heterogeneity of texture and grain size. It is shown that the present model predicts well the stress-strain responses in most of the multi-axial loading conditions which have been tested. Moreover, the model is able to capture various interesting behaviors of the present material during plastic deformation, including anisotropy, through-thickness heterogeneity, SDE of tension/compression or shear, and cross-hardening during non-proportional loadings. Furthermore, successful simulation of two structural level tests including a circular punch indentation and a three-point bending shows the applicability and potential of the new model in industrial practices.
Sanghoon Shin - One of the best experts on this subject based on the ideXlab platform.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Namsik ChungAbstract:Background— The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Doppler echocardiography–based MR quantification has well-documented limitations. Methods and Results— We consecutively enrolled 221 patients with MR. Adequate image quality was obtained by 2D- and 3D-color Doppler echocardiography in 211 (95.5%) patients. The quantitative differences between the MR volumes obtained by 2D- and 3D-proximal isovelocity surface area (PISA) were analyzed in various MR subgroups. In the validation cohort (n=52), MR volume obtained by 3D-PISA showed a better agreement with phase-contrast cardiac MRI than 2D-PISA ( r =0.97 versus 0.84). In all 211 patients, 2D-PISA underestimated the MR volume when compared with 3D-PISA (52.4±19.6 versus 59.5±25.6 mL; P =0.005). A total of 33.3% with severe MR based on 3D-PISA were incorrectly assessed by 2D-PISA as having nonsevere MR. In the subgroup analysis, the MR severity (odds ratio, 6.96; 95% confidence interval, 3.04–15.94; P 15 mL) between 2D- and 3D-PISA methods. Conclusions— Quantification of MR by 3D-PISA method is clinically feasible and more accurate than the current 2D-PISA method. MR quantification by 2D-PISA significantly underestimated MR volume with severe, eccentric MR with an asymmetrical orifice. This article demonstrates that 3D-color Doppler echocardiography could be used as a valuable tool to confirm treatment strategy in patients with significant MR.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Ran Heo, In Jeong Cho, Namsik ChungAbstract:Background—The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Dop...
Geuru Hong - One of the best experts on this subject based on the ideXlab platform.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Namsik ChungAbstract:Background— The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Doppler echocardiography–based MR quantification has well-documented limitations. Methods and Results— We consecutively enrolled 221 patients with MR. Adequate image quality was obtained by 2D- and 3D-color Doppler echocardiography in 211 (95.5%) patients. The quantitative differences between the MR volumes obtained by 2D- and 3D-proximal isovelocity surface area (PISA) were analyzed in various MR subgroups. In the validation cohort (n=52), MR volume obtained by 3D-PISA showed a better agreement with phase-contrast cardiac MRI than 2D-PISA ( r =0.97 versus 0.84). In all 211 patients, 2D-PISA underestimated the MR volume when compared with 3D-PISA (52.4±19.6 versus 59.5±25.6 mL; P =0.005). A total of 33.3% with severe MR based on 3D-PISA were incorrectly assessed by 2D-PISA as having nonsevere MR. In the subgroup analysis, the MR severity (odds ratio, 6.96; 95% confidence interval, 3.04–15.94; P 15 mL) between 2D- and 3D-PISA methods. Conclusions— Quantification of MR by 3D-PISA method is clinically feasible and more accurate than the current 2D-PISA method. MR quantification by 2D-PISA significantly underestimated MR volume with severe, eccentric MR with an asymmetrical orifice. This article demonstrates that 3D-color Doppler echocardiography could be used as a valuable tool to confirm treatment strategy in patients with significant MR.
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Differential Effect of 3 dimensional color doppler echocardiography for the quantification of mitral regurgitation according to the severity and characteristics
Circulation-cardiovascular Imaging, 2014Co-Authors: Jaehuk Choi, Geuru Hong, Ji Min Sung, Hyukjae Chang, Sanghoon Shin, Chi Young Shim, Ran Heo, In Jeong Cho, Namsik ChungAbstract:Background—The aim of this study is to explore the Differential Effect of 3-dimensional color Doppler echocardiography for the quantification of mitral regurgitation (MR). Two-dimensional color Dop...
