EP25.19: How to perform transvaginal 3D Omniview scan of the uterus: sagittal or transversal direction?

The aim of our study was to test the reliability of the 3D Omniview transvaginal scanning of the uterus in two directions- sagittal and trasversal. In this study 458 patients were included. Transvaginal 3D scan was performed by obtaining 3D volumes in two directions. The first volume was complete scan of the uterus in sagittal direction, utilising sweep angle of 100 degrees, and the second volume was transversal scan of the uterus in transversal direction with sweep angle of 120 degrees. Uterine cavity width and myometrial fundal thickness were measured after performing 3D free hand tracing through the midline section of the endometrium. Sagittal volume was analysed by AJ and transversal volume by ZJ without knowing of previous measurement values. Mean patients age in the study group was 33,6 ± 6,1 years. 49% of patients were nulliparous, 22,7% with one delivery, 21.6% with two deliveries, and 6,1% with three or more deliveries. Mean sagittal uterine cavity width was 32,31 ± 0,528mm and transversal uterine cavity width was 31,83 ± 0,51mm. There was significant correlation between these two measurement directions of uterine cavity width (r=0,955, p 0,001). Mean sagittal uterine fundal myometrium thickness was 12,39 ± 0,23mm and mean transversal uterine fundal myometrium thickness was 12,36 ± 0,23mm. There was significant correlation between these two measurement directions of fundal myometrium thickness (r=0,928, p 0,001). We confirmed that there was significant correlation between measurement of uterine cavity width measured in sagittal vs transversal direction in 3D volumes obtained by 3D Omniview transvaginal technique. There was significant correlation between fundal myometrial thickness measured in sagittal vs transversal direction in 3D volumes obtained by 3D Omniview technique. These results indicate that there is no image distortion when the uterus was scanned either in sagittal or transversal direction. Both scanning directions are reliable for the analysis of uterine cavity morphology and analysis of fundal myometrium.