Abstract
The ovaries can be sonographically visualized by transabdominal, transrectal, and transvaginal approach. The golden standard today is the transvaginal approach. Ultrasound provides insight into the psychological changes during the ovarian cycle. Ovaries are imaged as homogeneous, hypoechogenic ovoid structures with slightly echogenic central part. The dominant follicle can be detected between 8th and 12th day of the cycle. The dominant follicle has a linear daily diameter growth of 2–3 mm per day until ovulation, when the diameter of the dominant follicle is 18–28 mm. After ovulation the follicle is transformed in corpus luteum. Transvaginal color Doppler (TVCD) helps in better understanding of the menstrual cycle physiology. Before ovulation perifollicular flow has moderate RI (resistance index) around 0.54 ± 0.04. RI gradually declines and at ovulation measures 0.44 ± 0.04. The peak systolic velocity rises at the onset of ovulation. Corpus luteum formation is characterized with a dramatic increase of the amount of the blood flow with increased velocity and low impedance to blood flow (0.43 ± 0.04). The regression of corpus luteum is characterized with poor color Doppler signals and higher RI. The three-dimensional ultrasound (3D) can be used in order to obtain more information about the ovaries. Volume of the ovary can be measured and calculated more precisely. Dominant and other follicles can be measured automatically using SonoAVC (sonography-based automated volume count). Surface view of the inner layer of the dominant follicle can detect the cumulus oophorus. Antral follicular count can be measured by 2D or 3D ultrasound. The novel technique (SonoAVC) offers an automatic count of antral follicles. If 3D volume of the ovaries with vascularization is scanned, vascular indexes of the whole ovary can be measured (VI-vascular index, FI- flow index, and VFI- vascular flow index).
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Bauman, R., Muravec, U.R. (2014). The Normal Ovary (Changes in the Menstrual Cycle). In: Stadtmauer, L., Tur-Kaspa, I. (eds) Ultrasound Imaging in Reproductive Medicine. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9182-8_5
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DOI: https://doi.org/10.1007/978-1-4614-9182-8_5
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