Video taken of twins in utero taken by a high-tech monitor allows doctors to see how twins interact before they're born.
According to Marisa Taylor-Clarke of the Robert Steiner MR Unit at the Imperial College London, the images she recorded are "very processed, so they do a lot of reconstructing and computer work afterwards."
Primarily, Taylor-Clarke uses the technique to looking for a dangerous prenatal condition called twin-to-twin transfusion syndrome, in which an identical twin can absorb blood from the other. TTTS can harm both fetuses, depriving the donor twin of nutrients and putting too much pressure on the heart of the recipient.
At worst, Taylor-Clarke said, the condition can be fatal to both fetuses.