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P27.02: 3D placental volume in the first trimester: intraobserver variability of different VOCAL techniques

Objectives: Highlighting the alveolar ridge on three-dimensional volumes obtained when performing the screening for the end of the first trimester. Methods: A prospective study of group of 121 pregnant patients, each pregnancy with a single fetus. Each fetus had a 3D volume acquired between 11+0 and 13+6 weeks. Using multiplane and multislice technique we obtained a cranial axial section, highlighting the alveolar ridge and measuring its area. Three fetuses spontaneously aborted at 11, 12, 13 weeks, were studied, to compare the images obtained by ultrasound with the one from the miscarriage. The volume acquisitions were done by a different operator from the one responsible for choosing and processing the sections. The alveolar ridge area measurement was performed by two different operators and the results were compared. Results: Out of 120 volumes, at 100 fetus volumes, we obtained, using multiplane processing, sections similar to the one from the miscarriage (82.64%). The hyperechoic bowshaped area from the anterior region of the maxilla which represents the alveolar ridge was observed in these 100 volumes. Measurement of alveolar ridge area was possible in cross section obtained in all 100 volumes, without any significant differences between the two operators (mean 0.1900 cm2, 95% CI: 0.1754–0.2046, 0.1908 versus mean, 95% CI: 0.1762–0.2054, p: 0.9389). Conclusions: Analysis of volumes, stored when performing the end of the first trimester ultrasound screening, obtains sections which contain the alveolar ridge, part of the palate. This paper is partially supported by the Sectoral Operational Programme Human Resources Development, financed from the European Social Fund and by the Romanian Government under the contract number POSDRU/89/1.5/S/64153.