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Comparison of MRI and ultrasound in the evaluation of normal ovaries and follicles in women of childbearing age during the menstrual cycle
Pages: 515-521
Year: Issue:  5
Journal: Radiologic Practice

Abstract: Objective:To compare MR imaging with ultrasonography performed at the same day during different phases of menstrual cycle in the evaluation of dimensions of ovaries and number of follicles,and thus to investigate morphological changes of the normal ovaries and follicles in healthy child-bearing age women during the menstrual cycle.Methods:MR examinations of the pelvis were performed in 26 healthy women between 20 to 40 years old (mean,29 yrs).Each volunteer underwent totally four MR and ultrasound scans in menstrual phase (MP),follicular phase (FP),ovulatory phase (OP) and luteal phase (LP).Axial,coronal and sagittal T2 weighted images and axial T1 weighted images were obtained on a 3.0T MR scanner.Ovarian and follicular measurements were acquired on T2 WI.T1WI were used for diagnosis of ovarian anomaly.One-way analysis of variance,paired student t test and liner mixed models were preformed using SPSS statistics 19.0.Results:26 volunteers were included in our study (mean age:29.1 years,average BMI:20.3kg/m2 and average height:1.61m).Mean value of ovary dimensions,number of follicles and dimension of the biggest follicles were compared between MR imaging and ultrasonography.Both left and right ovarian volume and number of follicles acquired on MR were larger than that on ultrasound (P =0.000 ~ 0.003).Cyclic changes were found on left,right and overall maximum follicle diameter with the biggest diameter in LP.The maximum follicle diameter acquired by MR during menstrual cycle was as follows:MP (0.90 ± 0.28)cm,FP (1.24 ± 0.31)cm,OP (1.71 ± 0.54)cm,and LP (1.20 ± 0.66)cm;however,the maximum follicle diameter obtained by ultrasound was MP (1.01 ± 0.40)cm,FP (1.26 ± 0.46)cm,OP (1.47 ± 0.47)cm,and LP (0.89 ± 0.37)cm.The ovarian volume change was not obvious.Conclusion:There was statistical significant difference in the measurement of ovary and follicular structure between using MR and ultrasound,with bigger values obtained by MR.The changes of maximum follicle diameter during menstrual cycle were observed on both MR and ultrasound.
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