Contents 1 Introduction
Infertiliy management has received increased attention during the last two decades since technology of ultrasound scans has undergone very fast evolution and ultrasound imaging became an important tool in the process of In-Vitro Fertilization (IVF). Endovaginal ultrasound paved the way for efficient analysis of women's ovarian scans with improved resolution and image quality [1]. The success of IVF can be predicted by a correct quantitative and qualitative assessment of ovarian follicles [2]. Follicles are fluid-filled sacs that contain and can release ova for fertilization. They develop inside ovaries during a longer preantral period to their antral form when they reach about 1 to 2 mm in diameter. In a natural menstrual cycle, one of them becomes dominant when its size grows up to 4 to 5 mm. After 5 days, it increases to about 7 mm, after 10 days to about 14 mm, and, before ovulation, its diameter range is 18 to over 30 mm [4]. In a stimulated cycle, all or most of the antral follicles may grow, and several can be triggered by hormonal treatment to ovulate.
