Kinematics of the heart:: Strain-rate Imaging from time-resolved three-dimensional phase contrast MRI
Kinematics of the heart:: Strain-rate Imaging from time-resolved three-dimensional phase contrast MRI
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DOI：
10.1109/tmi.2002.804431
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发表时间：
2002-09-01
影响因子：
10.6
通讯作者：
Karlsson, M
中科院分区：
文献类型：
--
作者：
Selskog, P;Heiberg, E;Karlsson, M
A four-dimensional mapping (three spatial dimensions + time) of myocardial strain-rate would help to describe the mechanical properties of the myocardium, which affect important physiological factors such as the pumping performance of the ventricles. Strain-rate represents the local instantaneous deformation of the myocardium and can be calculated from the spatial gradients of the velocity field. Strain-rate has previously been calculated using one-dimensional (ultrasound) or two-dimensional (2-D) magnetic resonance imaging) techniques. However, this assumes that myocardial motion only occurs in one direction or in one plane, respectively.This paper presents a method for calculation of the time-resolved three-dimensional (3-D) strain-rate tensor using velocity vector information in a 3-D spatial grid during the whole cardiac cycle. The strain-rate tensor provides full information of both magnitude and direction of the instantaneous deformation of the myocardium. A method for visualization of the full 3-D tensor is also suggested. The tensors are visualized using ellipsoids, which display the principal directions of strain-rate and the ratio between strain-rate magnitude in each direction. The presented method reveals the principal strain-rate directions without a priori knowledge of myocardial motion directions.
