Subclinical uterine contractions in the third trimester have been detected with MRI in recent years and we regularly observe these contractions in 10 minute longitudinal scans. We have recently described how placental pump contractions differ from Braxton Hicks contractions, as defined by a reduction in placental volume. In this study, we have observed in detail the effects of 18 contractions on longitudinal single echo-planar imaging T2* weighted scans.
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