منابع مشابه
Direct Myocardial Strain Assessment from Frequency Estimation in Tagging MRI
We propose a new method to analyse deformation of the cardiac left ventricular wall from tagging magnetic resonance images. The method exploits the fact that the time-dependent frequency covector field representing the tag pattern is tightly coupled to the myocardial deformation and not affected by tag fading. Deformation and strain tensor fields can be retrieved from local frequency estimates ...
متن کاملCharacterization of normal regional myocardial function by MRI cardiac tagging.
PURPOSE The aim of this study was to establish reference values for segmental myocardial strain measured by magnetic resonance (MR) cardiac tagging in order to characterize the regional function of the heart. MATERIAL AND METHODS We characterized the left ventricular (LV) systolic deformation in 39 subjects (26 women and 13 men, age 58.8 ± 11.6 years) whose cardiological study had not reveale...
متن کاملQuantification of transmural differences in myocardial function with MRI tagging.
Many cardiac diseases cause transmural differences in myofiber function. With the Magnetic Resonance Imaging Tagging technique a grid of magnetic tags was attached to the heart. Using a model of cardiac mechanics the motion of these tags was analyzed to deduct the transmural gradient of myofiber shortening. In normal, young healthy subjects (n=9), the transmural difference in myofiber shortenin...
متن کاملMyocardial Deformation from Local Frequency Estimation in Tagging MRI
We consider a new method to analyse deformation of the myocardial wall from tagging magnetic resonance images. The method exploits the fact that a regular pattern of stripe tags induces a timedependent frequency covector field tightly coupled to the myocardial tissue and not affected by tag fading. The corresponding local frequency can be disambiguated with the help of the Gabor transform. The ...
متن کاملImaging Myocardial Tagging
It has been postulated that rotation of the left ventricular apex with respect to the base is a component of normal systolic function in humans, but it has been difficult to measure it noninvasively. Tagging is a new magnetic resonance imaging technique that labels specific areas of myocardium by selective radio-frequency excitation of narrow planes orthogonal to the imaging plane before acquir...
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ژورنال
عنوان ژورنال: Journal of Magnetic Resonance Imaging
سال: 1999
ISSN: 1053-1807,1522-2586
DOI: 10.1002/(sici)1522-2586(199911)10:5<609::aid-jmri4>3.3.co;2-u