Three‐ and four‐dimensional freehand fetal echocardiography: a feasibility study using a hand‐held Doppler probe for cardiac gating

To evaluate the clinical feasibility of the signal from a hand‐held Doppler probe as a real‐time tracking signal for dynamic three‐dimensional (3D) (so‐called four‐dimensional (4D)) fetal echocardiography in a random patient cohort.

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