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Fig. 5 | Cardiovascular Ultrasound

Fig. 5

From: Local myocardial stiffness variations identified by high frame rate shear wave echocardiography

Fig. 5

Shear wave velocity variation in a M-mode panel, theoretical model (a,b) and patient demonstration (c, d). a: uniform propagation of a wave (theoretical model). By tracing the wave front from the upper (white arrow) and respectively lower (yellow arrow) point we obtain two parallel lines; b: velocity variation along the 3 cm M-mode line (theoretical model). The upper point wave front (white arrow line) forms an angle (α) with the lower point arrow line (yellow line). This angle is resolved if the opening on either side is at least 2 ms (one time-frame at 500 Hz). It demonstrates a change in propagation velocity; c: outer layer tracing in a HCM patient. The wave front of the aortic shear wave is linear, the upper (white) and lower (yellow) point arrow lines are parallel; d: inner layer tracing in the same patient. There is a visible shift in slope, and the two lines intersect and form an angle. The spatial position of this intersection coincided with the transition scar-myocardium visible on 2D images

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