Sex determination using image processing reveals elliptical features of the female pelvic inlet

Area of Science:

• Anatomy
• Anthropology
• Radiology

Background:

• The pelvic inlet is a critical anatomical structure influencing childbirth.
• Understanding pelvic inlet morphology is essential for obstetrics and forensic anthropology.
• Previous research suggests potential sex-based differences in pelvic shape.

Purpose of the Study:

• To test the hypothesis that the female pelvic inlet exhibits greater ellipticity than the male pelvic inlet.
• To quantify sex-based differences in pelvic inlet shape using advanced imaging techniques.
• To assess the utility of pelvic inlet shape measures for sex determination.

Main Methods:

• Analysis of abdomino-pelvic computed tomography (CT) images from 600 individuals (300 males, 300 females).
• Utilized 3D reconstruction, image processing, ellipse fitting, and a genetic algorithm to measure pelvic inlet ellipticity.
• Employed discriminant analysis to evaluate sex determination accuracy based on derived shape parameters.

Main Results:

• Significant differences in pelvic inlet ellipticity were observed between males and females across all proposed measures.
• Discriminant analysis achieved a maximum sex determination accuracy of 79.7% using these morphometric parameters.
• The findings support the hypothesis of a more elliptical female pelvic inlet.

Conclusions:

• The female pelvic inlet shape is significantly more elliptical compared to the male pelvic inlet.
• Pelvic inlet morphology, specifically ellipticity, shows potential for sex determination in forensic and anthropological contexts.
• Further validation in diverse populations is recommended to solidify these findings on pelvic inlet evolution and sexual dimorphism.