Background: the study was performed in a prospective randomized fashion in order to compare the value of tansvaginal ultrasound, and the value of combined colour Doppler imaging of uterine, ovarian blood flow and transvaginal folliculometry in assessment of ovulation induction of infertile women. Objectives: Ovulation rate was taken as the gold standard for assessment of ovulation induction result. Patients and Methods: Analysis of the results provided the following information: A) Better sensitivity & specificity of colour Doppler indices in detection of ovulation. B) Better timing of human chorionic gonadotrophin administration & better ovulation rate when colour Doppler was used in cycle monitoring. Results: It can be concluded from the results of this study that combined use of transvaginal sonography & colour Doppler imaging is more reliable in assessment of ovulation & is more useful in monitoring of follicular growth and vascularity in clomiphene citrate induced cycles than the use of transvaginal ultrasound alone. Conclusion: combined use of transvaginal sonography & colour Doppler imaging is more reliable in assessment of ovulation & is more useful in monitoring of follicular growth and vascularity in clomiphene citrate induced cycles than the use of transvaginal ultrasound alone. The study opens a new field of ongoing research on the valuable application of colour Doppler studies in the management of gynecologic infertility due to ovarian cause.