... Diameter (TAD), backbone length (LV), occipitofrontal diameter (OFD), Abdominal circumference (AC), head circumference (HC), estimation of parietal transparent length, gestational age and expected ... : 220V ± 10%,50Hz ± 1Hz (AC Software Functions: General measurement: distance, circumference, area, oval, trace, volume, HR, gestational weekObstetric measurement soft: GS ...