The Experts below are selected from a list of 81075 Experts worldwide ranked by ideXlab platform
Thomas J Vogl - One of the best experts on this subject based on the ideXlab platform.
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value of a noise optimized virtual monoenergetic reconstruction technique in dual energy ct for planning of transcatheter aortic valve replacement
European Radiology, 2017Co-Authors: Simon S Martin, Moritz H Albrecht, Julian L Wichmann, K Husers, Janerik Scholtz, Christian Booz, Boris Bodelle, Ralf W Bauer, Sarah C Metzger, Thomas J VoglAbstract:Objectives To evaluate objective and subjective image quality of a noise-optimized virtual monoenergetic imaging (VMI+) reconstruction technique in dual-energy computed tomography (DECT) angiography prior to transcatheter aortic valve replacement (TAVR).
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value of a noise optimized virtual monoenergetic reconstruction technique in dual energy ct for planning of transcatheter aortic valve replacement
European Radiology, 2017Co-Authors: Simon S Martin, Moritz H Albrecht, Julian L Wichmann, K Husers, Janerik Scholtz, Christian Booz, Boris Bodelle, Ralf W Bauer, Sarah C Metzger, Thomas J VoglAbstract:Objectives To evaluate objective and subjective image quality of a noise-optimized virtual monoenergetic imaging (VMI+) reconstruction technique in dual-energy computed tomography (DECT) angiography prior to transcatheter aortic valve replacement (TAVR).
Harriet C Thoeny - One of the best experts on this subject based on the ideXlab platform.
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diffusion weighted imaging of the parotid gland influence of the choice of b values on the apparent diffusion coefficient value
Journal of Magnetic Resonance Imaging, 2004Co-Authors: Harriet C Thoeny, Frederik De Keyzer, Chris Boesch, Robert HermansAbstract:PURPOSE: To determine how the ADC value of parotid glands is influenced by the choice of b-values. MATERIALS AND METHODS: In eight healthy volunteers, diffusion-weighted echo-planar imaging (DW-EPI) was performed on a 1.5 T system, with b-values (in seconds/mm2) of 0, 50, 100, 150, 200, 250, 300, 500, 750, and 1000. ADC values were calculated by two alternative methods (exponential vs. logarithmic fit) from five different sets of b-values: (A) all b-values; (B) b=0, 50, and 100; (C) b=0 and 750; (D) b=0, 500, and 1000; and (E) b=500, 750, and 1000. RESULTS: The mean ADC values for the different settings were (in 10(-3) mm2/second, exponential fit): (A) 0.732+/-0.019, (B) 2.074+/-0.084, (C) 0.947+/-0.020, (D) 0.890+/-0.023, and (E) 0.581+/-0.021. ADC values were significantly (P <0.001) different for all pairwise comparisons of settings (A-E) of b-values, except for A vs. D (P=0.172) and C vs. D (P=0.380). The ADC(B) was significantly higher than ADC(C) or ADC(D), which was significantly higher than ADC(E). ADC values from exponential vs. logarithmic fit (P=0.542), as well as left vs. right parotid gland (P=0.962), were indistinguishable. CONCLUSION: The ADC values calculated from low b-value settings were significantly higher than those calculated from high b-value settings. These results suggest that not only true diffusion but also perfusion and saliva flow may contribute to the ADC.
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diffusion weighted imaging of the parotid gland influence of the choice of b values on the apparent diffusion coefficient value
Journal of Magnetic Resonance Imaging, 2004Co-Authors: Harriet C Thoeny, Frederik De Keyzer, Chris Boesch, Robert HermansAbstract:Purpose To determine how the ADC value of parotid glands is influenced by the choice of b-values. Materials and Methods In eight healthy volunteers, diffusion-weighted echo-planar imaging (DW-EPI) was performed on a 1.5 T system, with b-values (in seconds/mm2) of 0, 50, 100, 150, 200, 250, 300, 500, 750, and 1000. ADC values were calculated by two alternative methods (exponential vs. logarithmic fit) from five different sets of b-values: (A) all b-values; (B) b = 0, 50, and 100; (C) b = 0 and 750; (D) b = 0, 500, and 1000; and (E) b = 500, 750, and 1000. Results The mean ADC values for the different settings were (in 10−3 mm2/second, exponential fit): (A) 0.732 ± 0.019, (B) 2.074 ± 0.084, (C) 0.947 ± 0.020, (D) 0.890 ± 0.023, and (E) 0.581 ± 0.021. ADC values were significantly (P < 0.001) different for all pairwise comparisons of settings (A–E) of b-values, except for A vs. D (P = 0.172) and C vs. D (P = 0.380). The ADC(B) was significantly higher than ADC(C) or ADC(D), which was significantly higher than ADC(E). ADC values from exponential vs. logarithmic fit (P = 0.542), as well as left vs. right parotid gland (P = 0.962), were indistinguishable. Conclusion The ADC values calculated from low b-value settings were significantly higher than those calculated from high b-value settings. These results suggest that not only true diffusion but also perfusion and saliva flow may contribute to the ADC. J. Magn. Reson. Imaging 2004;20:786–790. © 2004 Wiley-Liss, Inc.
Louis Laflamme - One of the best experts on this subject based on the ideXlab platform.
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prognostic value of exercise capacity as evaluated by the 6 minute walk test in patients undergoing transcatheter aortic valve implantation
Journal of the American College of Cardiology, 2013Co-Authors: Luis Nombelafranco, Marina Urena, Robert Delarochelliere, Daniel Doyle, Henrique B Ribeiro, Melanie Cote, Philippe Pibarot, Hugo Delarochelliere, Louis Laflamme, Paul PoirierAbstract:To the Editor: Determination of individual patient risk for early-term and midterm outcomes following transcatheter aortic valve implantation (TAVI) has predominantly centered on baseline comorbidities, cardiac surgery risk algorithms, and peri-procedural complications. However, there is
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prognostic value of exercise capacity as evaluated by the 6 minute walk test in patients undergoing transcatheter aortic valve implantation
Journal of the American College of Cardiology, 2013Co-Authors: Michael Mok, Luis Nombelafranco, Marina Urena, Robert Delarochelliere, Daniel Doyle, Henrique B Ribeiro, Melanie Cote, Philippe Pibarot, Hugo Delarochelliere, Louis LaflammeAbstract:To the Editor: Determination of individual patient risk for early-term and midterm outcomes following transcatheter aortic valve implantation (TAVI) has predominantly centered on baseline comorbidities, cardiac surgery risk algorithms, and peri-procedural complications. However, there is
Ritva Vanninen - One of the best experts on this subject based on the ideXlab platform.
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Gadoterate meglumine decreases ADC values of breast lesions depending on the b value combination
Scientific Reports, 2018Co-Authors: Otso Arponen, Mazen Sudah, Anna Sutela, Mikko Taina, Amro Masarwah, Timo Liimatainen, Ritva VanninenAbstract:To retrospectively evaluated the influence of administration of the gadolinium based intravenous contrast agent (G-CA) on apparent diffusion coefficient (ADC) values in ADC maps generated using multiple b value combinations. A total of 106 women underwent bilateral 3.0 T breast MRI. As an internal validation, diffusion-weighted imaging (b values of 0, 200, 400, 600, 800 s/mm2) was performed before and after the G-CA (gadoterate meglumine (0.2 ml/kg, 3 ml/s)). Whole lesion and fibroglandular tissue (FGT) covering region-of-interests (ROIs) were drawn on the b = 800 s/mm2 images; ROIs were then propagated to multiple retrospectively generated ADC maps. Twenty-seven patients (mean age 55.8 ± 10.8 years) with 32 mass-like enhancing breast lesions including 25 (78.1 %) histopathologically malignant lesions were enrolled. Lesion ADC values were statistically significantly higher in pre-G-CA than post-G-CA ADC maps (ADC0,200,400,600,800: 1.05 ± 0.35 × 10−3 mm2/s vs. 1.02 ± 0.36 × 10−3 mm2/s (P
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gadoterate meglumine decreases adc values of breast lesions depending on the b value combination
Scientific Reports, 2018Co-Authors: Otso Arponen, Mazen Sudah, Anna Sutela, Mikko Taina, Amro Masarwah, Timo Liimatainen, Ritva VanninenAbstract:To retrospectively evaluated the influence of administration of the gadolinium based intravenous contrast agent (G-CA) on apparent diffusion coefficient (ADC) values in ADC maps generated using multiple b value combinations. A total of 106 women underwent bilateral 3.0 T breast MRI. As an internal validation, diffusion-weighted imaging (b values of 0, 200, 400, 600, 800 s/mm2) was performed before and after the G-CA (gadoterate meglumine (0.2 ml/kg, 3 ml/s)). Whole lesion and fibroglandular tissue (FGT) covering region-of-interests (ROIs) were drawn on the b = 800 s/mm2 images; ROIs were then propagated to multiple retrospectively generated ADC maps. Twenty-seven patients (mean age 55.8 ± 10.8 years) with 32 mass-like enhancing breast lesions including 25 (78.1 %) histopathologically malignant lesions were enrolled. Lesion ADC values were statistically significantly higher in pre-G-CA than post-G-CA ADC maps (ADC0,200,400,600,800: 1.05 ± 0.35 × 10−3 mm2/s vs. 1.02 ± 0.36 × 10−3 mm2/s (P < 0.05); ADC0,200,400: 1.25 ± 0.42 × 10−3 mm2/s vs. 1.20 ± 0.35 × 10−3 mm2/s (P < 0.05)). ADC values between pre- and post-contrast maps were not statistically different when the maps were generated using other b value combinations. Contrast agent administration did not affect the FGT ADC values. G-CA statistically significantly reduced the ADC values of breast lesions on ADC maps generated using the clinically widely utilized b values.
Luis Nombelafranco - One of the best experts on this subject based on the ideXlab platform.
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prognostic value of exercise capacity as evaluated by the 6 minute walk test in patients undergoing transcatheter aortic valve implantation
Journal of the American College of Cardiology, 2013Co-Authors: Luis Nombelafranco, Marina Urena, Robert Delarochelliere, Daniel Doyle, Henrique B Ribeiro, Melanie Cote, Philippe Pibarot, Hugo Delarochelliere, Louis Laflamme, Paul PoirierAbstract:To the Editor: Determination of individual patient risk for early-term and midterm outcomes following transcatheter aortic valve implantation (TAVI) has predominantly centered on baseline comorbidities, cardiac surgery risk algorithms, and peri-procedural complications. However, there is
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prognostic value of exercise capacity as evaluated by the 6 minute walk test in patients undergoing transcatheter aortic valve implantation
Journal of the American College of Cardiology, 2013Co-Authors: Michael Mok, Luis Nombelafranco, Marina Urena, Robert Delarochelliere, Daniel Doyle, Henrique B Ribeiro, Melanie Cote, Philippe Pibarot, Hugo Delarochelliere, Louis LaflammeAbstract:To the Editor: Determination of individual patient risk for early-term and midterm outcomes following transcatheter aortic valve implantation (TAVI) has predominantly centered on baseline comorbidities, cardiac surgery risk algorithms, and peri-procedural complications. However, there is
