| Title | Comparison of 3- and 2-dimensional sonographic techniques for counting ovarian follicles. | | Author(s) | Moawad NS, Gibbons H, Liu J, Lazebnik N | | Institution | Department of Obstetrics and Gynecology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, OH 44106 USA. | | Source | J Ultrasound Med 2009 Oct; 28(10):1281-8. | | Abstract | OBJECTIVE: The purpose of this study was to compare 3-dimensional (3D) and 2-dimensional (2D) ovarian follicle counts and 3D counts using stored volumes between experienced and inexperienced operators.
METHODS: Follicles larger than 5 mm were counted on 1 randomly selected ovary. Two-dimensional follicle counts were compared with stored 3D volumes by the same experienced operator (registered diagnostic medical sonographer [RDMS]). Counts using 3D stored data were compared between the experienced operator and inexperienced operator (principal investigator [PI]). The mean difference in follicle counts was computed, and a 1-sample Student t test was performed to test the hypothesis that the mean of the differences was 0. Comparison of the 2 methods and observers by Bland-Altman plots was used to determine any systematic differences based on the total number of follicles per selected ovary.
RESULTS: Mean differences differed from 0 (P < .005) for all 3 comparisons: 2D RDMS versus 3D RDMS, 2D RDMS versus 3D PI, and 3D RDMS versus 3D PI. For the comparison of 2D versus 3D counts done by the RDMS, 5 ovaries (10%) had a difference of more than 5 follicles counted; for the 2D RDMS versus 3D PI, 11 ovaries (22%) had a difference of more than 5 follicles; for the 3D RDMS versus 3D PI, 8 ovaries (16%) had a difference of more than 5 follicles. Mean differences in counts ranged 0.29 to 1.04 for ovaries with 10 or fewer follicles compared with 3.94 to 9.00 for ovaries with more than 10 follicles.
CONCLUSIONS: Follicle counts using 3D volumes were similar to 2D counts, and 3D follicle counts done by an inexperienced operator were similar to counts done by an experienced sonographer. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 19778873 |
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