A rectangular volume of data, enclosing the reproductive organs of interest, was selected from each of the two datasets. Cut planes were defined so as to eliminate overlying structures such as bowel, and to make visible the ovaries and the uterus. The rendering software allowed us to define a range of grey scale intensities that highlighted the desired organs, separating them from the surrounding fat and other tissues. This manual step was necessary because efforts at automated segmentation would always cause unwanted nearby structures of similar intensity to be included along with the desired organ. For generating the models, marching cubes and various filtering algorithms were applied to transform the slice data into outlines of objects, and then into a triangulated surface.
Differences are clearly visible in the shape, size, and position of the reproductive organs.
We measured the antero-posterior dimension of the uterus and ovary. In the SVH-F, a woman of reproductive age, the uterus measures 4.6cm and the ovaries are 1.8cm.