Disclosed is a computer-implemented method (200) for determining an ovarian follicle count and size (diameter) from a 2-D transvaginal ultrasound scan. The method comprises receiving (210) at least one 2-D (two-dimensional) transvaginal ultrasound scan (15, 15'), comprising a plurality of 2-D ultrasound images (150, 150') captured along a translation direction (155, 155') of an ultrasound probe (14) used to capture said scan, detecting candidate follicles (152) in the plurality of 2-D ultrasound images of the at least one 2-D transvaginal ultrasound scan； segmenting (240) the detected candidate follicles to determine (248) an average diameter for each candidate follicle； and presenting (280) the determined average diameters and the segmentations of the detected candidate follicles. A computer program product, ultrasound image processing device and ultrasound imaging system adapted to implement this method are also disclosed.
