Automatic Evaluation of Progression Angle and Fetal Head Station through Intrapartum Echographic Monitoring
Figure 1
(a) Schematic diagram of the experimental setup adopted for assessment of tracking accuracy. (b) Scheme of the conventions is adopted to define fetal head station (FHS) indicated in red, where the solid white line is the line perpendicular to the symphysis longitudinal axis (dashed white line); the green line is the line passing by the fetal head outermost point; (c) scheme of the conventions adopted to define progression angle (PA) indicated in red, where the double white line is the connection between the symphysis distal end and the fetal head outermost point. By positioning the fetal head at different locations in the space comprised within the maternal pubic bone (birth canal), different stages of labor were simulated and relative position of the fetal head outermost point and distal end of the symphysis (both indicated by a solid black dot) were evaluated in terms of FHS and PA.
