Movie shows a 19 week fetus in 3 dimensional (3D) in realtime (hence 4D). The beginning of the movies shows the fetus lying with head to right and lower limbs to left. The overlay shows region selected for realtime 3D scanning. (More? Labelled Image)
The 4D view (dorsolateral) Arrow indicates: initially head, then upper limbs, then lower limbs, then umbilical cord and finally the placenta. The second part of movie shows fetal movements.
Quicktime movie: 19wk4D.mov (3 Mb) in new window.
(Quicktime H264 video compression, 672x512, 23 seconds, greyscale)
Image from beginning of above movie showing scan region in 4D movie, lower limb, skull and lower jaw clearly visible. Note "crown" to "rump" length (CRL) used in the staging/ageing of the fetus. Shape of scanning region (envelope) indicates probe located at top of image.
Movie image below from above scan region (rotated 90 degrees in 2 planes) showing dorsolateral view of fetus: head to top, upper limbs, lower limbs and umbilical cord visible. Note the fetal proportions including teh extended "neck" region.
Compare the size of this fetus with the earlier 12 week ultrasound images.