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Related Experiment Videos

Inability of sonography to detect imminent ovulation.

D Zandt-Stastny1, M K Thorsen, W D Middleton

  • 1Department of Radiology, Medical College of Wisconsin, Milwaukee, WI 53226.

AJR. American Journal of Roentgenology
|January 1, 1989
PubMed
Summary
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Transvaginal sonography, despite its high resolution, cannot reliably predict imminent ovulation by identifying the cumulus oophorus or follicle wall changes. This ultrasound technique is not a confident predictor of ovulation timing.

Area of Science:

  • Reproductive endocrinology and imaging

Background:

  • Conventional transabdominal sonography has shown potential in identifying signs of imminent ovulation, such as cumulus oophorus visualization or dominant follicle wall alterations.
  • The clinical utility of advanced ultrasound techniques for precise ovulation prediction remains an area of interest, particularly for assisted reproductive technologies.

Purpose of the Study:

  • To evaluate the efficacy of transvaginal sonography (TVS) in providing more frequent and confident predictions of imminent ovulation compared to conventional methods.
  • To assess whether specific sonographic features, including cumulus oophorus visualization and follicle wall morphology, can reliably indicate impending ovulation using TVS.

Main Methods:

  • A prospective study involving 22 ovulatory menstrual cycles from 17 women (4 undergoing artificial insemination, 13 volunteers).

Related Experiment Videos

  • Transvaginal sonography with a 7.5-MHz transducer was performed on alternate days during the periovulatory period.
  • Focus on identifying the cumulus oophorus and subtle changes in the dominant follicle wall.

    • Main Results:

    • Despite the enhanced resolution of transvaginal sonography, confident identification of the cumulus oophorus was not achieved in any monitored cycles.
    • Morphologic alterations in the dominant follicle wall, indicative of imminent ovulation, were not consistently observed or reliably identifiable.
    • No other specific sonographic follicular characteristic emerged as a consistent predictor of impending ovulation.

    Conclusions:

    • Transvaginal sonography, even with its superior imaging capabilities, does not enable confident prediction of imminent ovulation.
    • The sonographic signs previously reported with transabdominal approaches are not reliably visualized or interpreted with transvaginal ultrasound for ovulation timing.