scholarly journals Left Ventricle Quantification Using Direct Regression with Segmentation Regularization and Ensembles of Pretrained 2D and 3D CNNs

2020 ◽  
pp. 375-383
Author(s):  
Nils Gessert ◽  
Alexander Schlaefer
Keyword(s):  
Left Ventricle ◽  
2D And 3D ◽  
Direct Regression

scholarly journals 1180 2D and 3D assessment of the left ventricle volume and ejection fraction in a general population

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
F Ericsson ◽  
B Tayal ◽  
K Hay Kragholm ◽  
T Zaremba ◽  
N Holmark Andersen ◽  
...  
Keyword(s):  
General Population ◽  
Left Ventricle ◽  
Ejection Fraction ◽  
Large Population ◽  
Systolic Volume ◽  
End Diastolic Volume ◽  
Significant Difference ◽  
End Systolic Volume ◽  
The Mean ◽  
2D And 3D

Abstract Introduction In standard practice, LV volumes and EF are estimated by 2D technique. 3D echocardiographic assessment seems more reliable; however, this method has not yet been validated in the general population. Purpose To validate 3D echocardiography in a large population sample and investigate differences between 2D and 3D LVEF and volumes Methods In The Copenhagen City Heart Study, 4466 echocardiograms were available for analysis. The echocardiograms were obtained during four consecutive heartbeats in both 2D and 3D with GE Vivid E9. Offline analysis was performed on EchoPac v. 201. LVEF was calculated by the modified Simpsons Biplane Auto EF for 2D and by the 4LVQ method for 3D. Results The study included 2090 echocardiograms. The mean 2D LVEF was 57.3 ± 6.1% (IQR 54 - 61%) and 51.7 ± 7.9% (IQR 47 - 57%) by 3D. The mean end-diastolic volume (EDV) and end-systolic volume (ESV) by 2D and 3D techniques were: EDV 2D 106.1 ± 29.6 ml vs EDV 3D 128.2 ± 32.3 ml , ESV 2D 45.7 ± 15.6 ml vs. ESV 3D 45.7 ± 20.7 , p < 0.05 among all variables. The average difference of means between 2D and 3D LVEF was 5.6 ± 11.2%, -22.1 ± 56.8 ml for EDV, and -16.9 ± 32.9 ml for ESV. The correlation coefficient for LVEF was 0.42, EDV 0.76 and for ESV 0.70. Conclusion In our study, we found a significant difference in both LVEF and ventricular volumes when comparing 2D echocardiograms with 3D. 3DE had, in general, lower LVEF, higher EDV and ESV compared to 2D. Table 1: Summary of results Table 1 - Summary of results n = 2090 Variable Min Max Mean IQR (25-75) p-value LVEF, 2D (%) 18 76 57.3 ± 6.1 54-61 < 0.05 LVEF, 3d (%) 13 77 51.7 ± 7.9 47-57 < 0.05 EDV, 2D (ml) 13 275 106.1 ± 29.6 85-123.8 < 0.05 EDV, 3D (ml) 50 270 128.2 ± 32.3 106-148 < 0.05 ESV, 2D (ml) 15 150 45.7 ± 15.6 35-54 < 0.05 ESV, 3D (ml) 13 185 45.7 ± 20.7 48-74 < 0.05 LVEF: left ventricle ejection fraction, EDV: end-diastolic volume, ESV: end systolic volume, IQR: Inter-quartile range Abstract 1180 Figure 1: Correlation and BA-plot

scholarly journals 1027 Mechanical dispersion of the left and right ventricle and the correlation with ventricular arrhythmias in hypertrophic cardiomyopathy

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
N M Popa-Fotea ◽  
M M Micheu ◽  
M Dorobantu
Keyword(s):  
Left Ventricle ◽  
Right Ventricle ◽  
Ventricular Arrhythmias ◽  
Speckle Tracking ◽  
Control Group ◽  
Mechanical Dispersion ◽  
2D Speckle Tracking ◽  
The Right ◽  
Ventricular Tachycardias ◽  
2D And 3D

Abstract Funding Acknowledgements CREDO Project - ID: 49182, financed through the SOP IEC -A2-0.2.2.1-2013-1 cofinanced by the ERDF Introduction One important cause of sudden cardiac death in hypertrophic cardiomyopathy (HCM) are ventricular arrhythmias. In patients with HCM, non-sustained ventricular arrhythmias were analysed in relation with 2D speckle tracking mechanical dispersion of left ventricle (LVMD), but not in relation with mechanical dispersion of the right ventricle. Purpose To investigate the possible associations between mechanical dispersion and other echocardiographic parameters and the development of non-sustained ventricular tachycardias (NSVT) in HCM patients. Methods Clinical, 24 hours ECG-Holter, 2D and 3D echocardiography data were registered in HCM patients and in a healthy control group (with normal echocardiography). The 24 hours ECG-Holter was used for detecting NSVT. LVMD was calculated as the standard deviation of time to peak negative strain in the sixteenth segments of the left ventricle. The right ventricle mechanical dispersion (RVMD) was calculated on a three free wall segments model (FWMD), but also in six segments (three RV free wall segments plus three septal segments). Right and left ventricle function was evaluated by conventional echography and 2D speckle tracking imaging. Results Fifty-two patients with HCM and thirty-six age and sex matched subjects were included in the study. In HCM group, 6 patients (11,5%) associated biventricular hypertrophy, while 15 (28.8%) had NSVT on ECG monitoring (group HCM1). HCM1 patients had a much higher LVMD (77.38 ± 11.19 ms) compared with HCM patients without NSVT (group HCM2) (55.8 ± 23.85 ms, p = 0.001, CI:-33.9,-9.3) or compared with controls (43.07 ± 14.19 ms, p <0.001, CI: -44.68, -25.99). The 6 segments RVMD (60.23 ± 10.2 ms) was significantly higher in the CMH1 group compared with CMH2 (45.22 ± 9.8 ms, p = 0.01, CI: -32.1, -28.1) or with the control group (22 ±14 ms, p < 0.001,CI: -36.28, -30.12) independently of the existence of RV hypertrophy. Also, FWMD (55.2 ± 4.8 ms) was significantly higher in CMH1 group in comparation with CMH2 (42.3 ± 5.6 ms, p = 0.02, CI: -27.1, -8.2) or controls (32.1 ± 2.2 ms, p = 0.006, CI: -28.1, -12.1). The presence of NSVT correlated with global longitudinal strain (GS) 2C (-0.442, p = 0.009), GS LAX (r=-0.373, p = 0.03), GS mean value (r=-0.345, p = 0.046), LVMD (r = 0.462, p = 0.006), FWMD (r = 0.51, p = 0.004), 6 segments RVMD (r = 0.46, p = 0.05), 2D and 3D left atrial volume (r = 0.446, p = 0.008 and respectively, r = 0.512, p = 0.002). In a logistic regression, the only parameters associated with NSVT were LVMD (OR = 1.046, p = 0.05), FWMD (OR = 1.03, p = 0.05) and 6 segments MD (OR = 1.1, p = 0.04). Conclusions Increased mechanical dispersion of the left, but also right ventricle is associated with the risk of non-sustained ventricular tachycardias in HCM patients.

scholarly journals Blood flow patterns estimation in the left ventricle with low-rate 2D and 3D dynamic contrast-enhanced ultrasound

2021 ◽  
Vol 198 ◽  
pp. 105810
Author(s):  
Peiran Chen ◽  
Ruud J.G. van Sloun ◽  
Simona Turco ◽  
Hessel Wijkstra ◽  
Domenico Filomena ◽  
...  
Keyword(s):  
Blood Flow ◽  
Left Ventricle ◽  
Flow Patterns ◽  
Contrast Enhanced Ultrasound ◽  
Dynamic Contrast Enhanced ◽  
Contrast Enhanced ◽  
Blood Flow Patterns ◽  
2D And 3D ◽  
Low Rate

Three-dimensional Look-Locker MRI for evaluation of postcontrast myocardial and blood T1 values: Comparison with two-dimensional Look-Locker and late gadolinium enhancement MRI

2013 ◽  
Vol 54 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Yasuo Amano ◽  
Masaki Tachi ◽  
Shinichiro Kumita
Keyword(s):  
Late Gadolinium Enhancement ◽  
Left Ventricle ◽  
Three Dimensional ◽  
Breath Hold ◽  
Two Dimensional ◽  
Gadolinium Enhancement ◽  
Myocardial Scarring ◽  
Myocardial Diseases ◽  
Myocardial T1 ◽  
2D And 3D

Background Two-dimensional (2D) Look-Locker MRI technique can identify myocardial fibrosis, but cannot cover the whole left ventricle during a single scan. Purpose To develop breath-hold three-dimensional (3D) Look-Locker MRI for the evaluation of postcontrast myocardial and blood T1 values and myocardial scarring in the left ventricle. Material and Methods A phantom and 24 patients with myocardial diseases underwent gadolinium-enhanced 2D and 3D Look-Locker MRI using a 1.5-T unit. We compared the T1 value of the phantom and the values of the myocardium and blood in the patients between the two Look-Locker MRI sequences. In the patient study, the scan ordering of the two Look-Locker MRI was selected randomly. We also assessed the ability of the 3D imaging to detect myocardial scarring that was confirmed by late gadolinium enhancement MRI. Results The phantom study showed a good agreement for the T1 value between 2D and 3D Look-Locker MRI. There were no significant differences in the myocardial T1 values after contrast between 2D and 3D Look-Locker MRI or in the T1 values between the two imaging slices on the 3D Look-Locker MRI (P > 0.10). A better agreement for the myocardial T1 values was found when the 3D Look-Locker imaging was performed first. The T1 values for blood were affected by the scan order (P < 0.05). The 3D Look-Locker MRI showed myocardial scarring with a shorter T1 value (290.4 ± 62.7 ms) than those for unscarred myocardium (360.8±30.3 ms). Conclusion Three-dimensional Look-Locker MRI may precisely estimate the postcontrast myocardial and blood T1 values for the entire left ventricle during a single scan.

Double-chambered left ventricle diagnosis by 2D and 3D echocardiography: From fetus to birth

2018 ◽  
Vol 36 (1) ◽  
pp. 196-198
Author(s):  
Chao Xue ◽  
Ying Zhao ◽  
Ye Zhang ◽  
Xiaoyan Gu ◽  
Jiancheng Han ◽  
...  
Keyword(s):  
Left Ventricle ◽  
3D Echocardiography ◽  
2D And 3D

Analysis of 2D and 3D defects associated with precipitation of Cu in silicon

1991 ◽  
Vol 49 ◽  
pp. 870-871
Author(s):  
P.M. Rice ◽  
MJ. Kim ◽  
R.W. Carpenter
Keyword(s):  
Colony Growth ◽  
Dark Field ◽  
Dark Side ◽  
Silicide Phase ◽  
Strain Fields ◽  
Near Surface ◽  
Unknown Composition ◽  
Secondary Precipitates ◽  
20 Nm ◽  
2D And 3D

Extrinsic gettering of Cu on near-surface dislocations in Si has been the topic of recent investigation. It was shown that the Cu precipitated hetergeneously on dislocations as Cu silicide along with voids, and also with a secondary planar precipitate of unknown composition. Here we report the results of investigations of the sense of the strain fields about the large (~100 nm) silicide precipitates, and further analysis of the small (~10-20 nm) planar precipitates.Numerous dark field images were analyzed in accordance with Ashby and Brown's criteria for determining the sense of the strain fields about precipitates. While the situation is complicated by the presence of dislocations and secondary precipitates, micrographs like those shown in Fig. 1(a) and 1(b) tend to show anomalously wide strain fields with the dark side on the side of negative g, indicating the strain fields about the silicide precipitates are vacancy in nature. This is in conflict with information reported on the η'' phase (the Cu silicide phase presumed to precipitate within the bulk) whose interstitial strain field is considered responsible for the interstitial Si atoms which cause the bounding dislocation to expand during star colony growth.

Covalent organic frameworks: an ideal platform for designing ordered materials and advanced applications

2021 ◽  
Author(s):  
Ruoyang Liu ◽  
Ke Tian Tan ◽  
Yifan Gong ◽  
Yongzhi Chen ◽  
Zhuoer Li ◽  
...  
Keyword(s):  
Covalent Organic Frameworks ◽  
2D And 3D ◽  
Advanced Applications

Covalent organic frameworks offer a molecular platform for integrating organic units into periodically ordered yet extended 2D and 3D polymers to create topologically well-defined polygonal lattices and built-in discrete micropores and/or mesopores.

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