Cardiac anatomy as a biometric Codella, N. C. F.; Connell, J.; Ratha, N. ...
2012 19th IEEE International Conference on Image Processing,
2012-Sept.
Conference Proceeding
In this study, we propose a novel biometric signature for human identification based on anatomically unique structures of the left ventricle of the heart. An algorithm is developed that analyzes the ...3 primary anatomical structures of the left ventricle: the endocardium, myocardium, and papillary muscles. Comparisons of these analyses between probe and gallery images produces a similarity score that is used as the basis of the biometric. The performance of the algorithm is tested on a cohort of 10 de-identified subjects imaged by Cardiac MRI. Perfect matching between individuals is obtained with good separation between the genuine and impostor classes. In summary, this study demonstrates using anatomy of the left ventricle of the human heart for the purposes of a biometric signature.
This work compares the performance of four navigator gating algorithms (accept/reject (A/R), diminishing variance algorithm (DVA), phase ordering with automatic window selection (PAWS), and ...retrospective gating (RETRO)) in suppressing respiratory motion artifacts in free-breathing 3D balanced steady-state free precession coronary MRA. In ten volunteers, the right coronary artery (RCA) or the left anterior descending artery (LAD) was imaged (both if time permitted) at 1.5 T with the four gating techniques in random order. Vessel signal, vessel contrast and motion suppression was scored by the consensus of two blinded readers. In 15 imaged vessels (9 RCA and 6 LAD), PAWS provided significantly better image quality than A/R (P < 0.05), DVA (P = 0.02) and RETRO (P = 0.002). While the quality difference between A/R and DVA was not statistically significant, both algorithms yielded significantly better image quality than RETRO. PAWS and DVA were the most efficient algorithms, providing an approximately 20% and 40% relative increase in average navigator efficiency compared to A/R and RETRO, respectively.
Background Left atrial (LA) dilation provides a substrate for mitral regurgitation (MR) and atrial arrhythmias. ECG can screen for LA dilation but standard approaches do not assess LA geometry as a ...continuum, as does non-invasive imaging. This study tested ECG-quantified P wave area as an index of LA geometry. Methods and Results 342 patients with CAD underwent ECG and CMR within 7 (0.1 plus or minus 1.4) days. LA area on CMR correlated best with P wave area in ECG lead V1 (r = 0.42, p<0.001), with lesser correlations for P wave amplitude and duration. P wave area increased stepwise in relation to CMR-evidenced MR severity (p<0.001), with similar results for MR on echocardiography (performed in 86% of patients). Pulmonary arterial (PA) pressure on echo was increased by 50% among patients in the highest (45 plus or minus 14 mmHg) vs. the lowest (31 plus or minus 9 mmHg) P wave area quartile of the population. In multivariate regression, CMR and echo-specific models demonstrated P wave area to be independently associated with LA size after controlling for MR, as well as echo-evidenced PA pressure. Clinical follow-up (mean 2.4 plus or minus 1.9 years) demonstrated ECG and CMR to yield similar results for stratification of arrhythmic risk, with a 2.6-fold increase in risk for atrial fibrillation/flutter among patients in the top P wave area quartile of the population (CI 1.1-5.9, p = 0.02), and a 3.2-fold increase among patients in the top LA area quartile (CI 1.4-7.0, p = 0.005). Conclusions ECG-quantified P wave area provides an index of LA remodeling that parallels CMR-evidenced LA chamber geometry, and provides similar predictive value for stratification of atrial arrhythmic risk.
Reply Min, James K; Shaw, Leslee J; Devereux, Richard B ...
Journal of the American College of Cardiology,
04/2008, Letnik:
51, Številka:
15
Journal Article
Recenzirano
Among the 106 patients with CCTA-identified moderate to severe 3-vessel coronary artery disease (defined by severe plaque in the proximal or midportions of the left anterior descending ...artery/diagonal branch and left circumflex artery/obtuse marginal branch and right coronary artery, or moderate to severe plaque in the left main artery), 37 underwent subsequent invasive coronary angiography, with 6 undergoing percutaneous or surgical revascularization.
Reply Min, James K.; Shaw, Leslee J.; Devereux, Richard B. ...
Journal of the American College of Cardiology,
04/2008, Letnik:
51, Številka:
15
Journal Article
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