| Two-dimensional vs three-dimensional transvaginal color Doppler sonography. (a) Diagram (left) and two-dimensional TV-CDS (right) showing arcuate, radial, and spiral vessels in follicular phase. (b) Diagram (left) are two-dimensional TV-CDS (right) showing changes in endometrial vascularity throughout the menstral cycle. During the luteal phase, several spiral vessels are detected. (c) Diagram (top) and multiplanar images (left) and magnified 3D TV-CDS (right) of corpus luteum. The multiplanar image shows the vascular "wreath" surrounding the functioning corpus luteum in the longitudinal (top left), short (axial) (top right) and coronal (bottom right) planes. The combined gray scale and 3D TV-CDS image (both left) which is also magnified and shown as the right depicts the numerous vessels surrounding this corpus luteum. |