Fig. 1
From: Dynamic fetal cardiovascular magnetic resonance imaging using Doppler ultrasound gating
Doppler Ultrasound Trigger Device. a Schematic illustration of the experimental setup during fetal CMR showing placement of the Doppler ultrasound (DUS) transducer (*) on the maternal abdomen. The connecting cable has four traps (**) to avoid electromagnetic interferences from radiofrequency pulses. b Example of generated DUS gating signals represented by maximum signal peaks. The fetal heart beat was recorded by the DUS transducer and processed to allow for maximum peak detection