130 F. UP Coordination The fact that locally, e.g., along the anterior or posterior wall, UP shows a dominant direction, does not guarantee an effective peristaltic movement that is coordinated and generates microstreaming in the endometrial cavity. Simply focusing on the anterior and posterior walls, coordinated, effective peristalsis requires UP propagation on both sides of the endometrium to show the same direction at the same time. Especially before ovulation, muscles from both sides of the endometrium have to produce coordinated contractions to support sperm transport from the vagina to the fallopian tubes, where fertilization occurs [25], [27]. Similar time evolution of the ER is expected from both the anterior (ERant) and posterior (ERpos) walls of the endometrium that are expected. Similarity measures, namely, cross correlation (CC), mean squared error (MSE), and Hausdorff distance (Hd) [17], [28], were therefore employed as cost functions to assess the spatiotemporal coordination of the UP.
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