Enhancing 2D Cervical Length With 3D Cervix Imaging Emphasizing the Center Reference Point

Abstract

Use of transvaginal ultrasonography for cervical length measurement at the 20-week anatomic examination has been suggested as a screening method to predict the risk of preterm birth. This article describes a three-dimensional ultrasonographic multiplanar imaging method of cervical length measurement by manipulating the center reference point and volume axes. This methodology should yield a more consistent, accurate measurement of the cervical length compared to conventional two-dimensional ultrasonographic methods. Also described are additional software image manipulation techniques to enhance visualization of the relational anatomy of the cervix. Precise utilization of the center reference point and available image reconstruction software augment current two-dimensional morphologic information of the lower genital tract.