Use of a 4D Planispheric Transformation for the Tracking and the Analysis of LV Motion with Tagged MR Images

Jérôme Declerck 1 Nicholas Ayache Elliot R. Mcveigh
1 EPIDAURE - Medical imaging and robotics
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : A major issue in cardiac imaging is the assessment of cardiac function and particularly the identification of ischemic or infarcted tissues. We present in this article a method to reconstruct the displacement field of the left ventricular (LV) motion using 4D planispheric transformations of time and space combined in a first step with B-spline tensor products. Because of the 4D modeling, a) it is possible to include any tag plane direction as input data. b) The use of planispheric coordinates makes the numerical evaluation more stable as compared to prolate spheroidal coordinates, the equivalent focal point being much further from the apical area of the heart. This therefore avoids mathematical instability when the material points of the myocardium are too close to the apical focus. c) In the temporal modeling, a simple adaptation is possible to changing temporal dynamics, such as introduced by ectopic pacing or rapid filling after systole. d) Finally, the strain analysis and displacement parameters that are used for the spatial modeling are computed at any point of the LV volume. Experiments are conducted on a normal and a pathological LV (posterior infarct) in order to assess the tuning of the parameters of the method. The mean RMS-distance error is less than 0.5mm for both LVs. Finally, the motion is analysed as zeroth (displacement) and first order parameters (strain), which estimate are smooth.
Type de document :
Rapport
RR-3535, INRIA. 1998
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https://hal.inria.fr/inria-00073150
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Soumis le : mercredi 24 mai 2006 - 11:59:55
Dernière modification le : samedi 27 janvier 2018 - 01:31:31
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Jérôme Declerck, Nicholas Ayache, Elliot R. Mcveigh. Use of a 4D Planispheric Transformation for the Tracking and the Analysis of LV Motion with Tagged MR Images. RR-3535, INRIA. 1998. 〈inria-00073150〉

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