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In a previous work, we used Factor Analysis of Dynamic Structures (FADS) to analyze the contribution and spatial distribution of the 3 most significant factors (3-MSF) present in a dynamic series of equilibrium radionuclide angiography images. In this work, a probability density function model of the 3-MSF extracted from FADS for a control group is presented; also an index, based on the likelihood between the control group's contraction model and a sample of normal subjects is proposed. This normality index was compared with those computed for two cardiopathic populations, satisfying the clinical criteria to be considered as candidates for a CRT. The proposed normality index provides a measure, consistent with the phase analysis currently used in clinical environment, sensitive enough to show contraction differences between normal and abnormal groups, which suggests that it can be related to the degree of severity in the ventricular contraction dyssynchrony, and therefore shows promise as a follow-up procedure for patients under CRT.<\/jats:p>","DOI":"10.1155\/2013\/617604","type":"journal-article","created":{"date-parts":[[2013,3,24]],"date-time":"2013-03-24T21:00:53Z","timestamp":1364158853000},"page":"1-12","source":"Crossref","is-referenced-by-count":1,"title":["Normality Index of Ventricular Contraction Based on a Statistical Model from FADS"],"prefix":"10.1155","volume":"2013","author":[{"given":"Luis","family":"Jim\u00e9nez-\u00c1ngeles","sequence":"first","affiliation":[{"name":"Nuclear Cardiology Department, Instituto Nacional de Cardiolog\u00eda \u201cIgnacio Ch\u00e1vez\u201d, Juan Badiano No. 1 Colonia Seccion XVI, 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