155 Figure 6.2: Ultrasound image of the uterus in the midsagittal section. Placement of the speckle tracking grid (red dots) along the endometrial border (blue line) at 5 mm (green line) from the apex of the fundus. Figure 6.3: Ultrasound images of uterus in midsagittal section with depiction of contractions in the longitudinal (left) and radial (right) direction Euclidean distance was used to derive the distance between each pair resulting in absolute motion estimates. The strain, ∈, was defined as the relative variation of the distance, d, between the tracked blocks as: ∈=d(j)−d(j−1)/d(j−1), where d(j) and d(j - 1) indicate the distance between the tracked blocks at the current frame (j) and previous frame (j – 1), respectively. Contraction Frequency: Frequency features were analysed separately for the anterior and posterior wall of the uterus, in the longitudinal and radial direction. We will only present the longitudinal direction of contractions here. Frequency-related features are
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