OP22.01: Comparison of uterus volume measurements in patients with adenomyosis using two‐dimensional and three‐dimensional ultrasound

To evaluate accuracy of two-dimensional ultrasound in uterus volume measurements of patients with adenomyosis. This study included 31 women with adenomyosis between December 2010 and February 2011 and transvaginal ultrasound examinations were performed. The examinations were stored digitally on an internal disk drive for subsequent measurements in virtual organ computer-aided analysis (VOCAL) program. All 2D images and 3D volumes were obtained using the Philips with transvaginal 5-MHz to 9-MHz transducer. Two sets of 2D and 3D measurements were performed by one ultrasonographer to calculate intraobserver reproducibility. 2D volume measurements was obtained by multiplying maximal diameters in transverse, vertical and frontal axes by the same factor: that is, volume (ml)=length * height*width *0.5236.The levels of agreement between 2D and 3D volumes were calculated using intraclass correlation coeffieicents(ICC). Mean differences among the volumes of 2D and 3D measurements were tested by Paired t test. Values of p < 0.05 were accepted as significant. Median 2D volumes of the first and second measurement were 170.8ml (69.9-472.2ml) and 189.8ml (87.7-480.9ml). Median 3D volumes were 200.1ml (80.1-490.2ml), 201.1ml (90.6-494.0ml) for first and second measurement respectively. The intraobserver variability for 2D volume measurements was 0.993 and for 3D, 0.998. The intraclass correlation coeffecients of 2D and 3D volume measurement was 0.989. Mean difference of volume measurement between 2D and 3D was −14.4 (−20.6,-8.3 p < 0.01). The uterus volume measurements of adenomyosis using 2D and 3D ultrasound showed high reproducibility (0.993, 0.998). However, the uterus volume measurement significantly reduced in 2D volume when compared with 3D volume.