124 (xn, yn) for each frame n by averaging the movement of TMsmidline in the horizontal and vertical directions. After that, we estimated the rotation of the endometrium ( n ) by linear fitting based on the coordinates of TMsmidline [see Figure 5.3(b)]. In this way, even if part of the endometrium was affected by OOP motion, the global translation and rotation could still be recovered from the rest of TMsmidline , which were not affected by OOP motion. Figure 5.3. A. Ten TMsmidline selected along the middle lining of the endometrium. B. OOP motion started from the nth frame. Although speckle tracking failed with two TMs (indicated with white arrow), the global rotation of the endometrium could still be recovered by the fit lines between the subsequent frames. A B.
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