Measurement of blood flow in the fetal heart and the great vessels is challenging due to fetal motion and small vessel sizes. 2D methods for fetal flow imaging require significant slice piloting to locate the vessels, and small changes in fetal position can often necessitate reacquisition. In this work, we demonstrate the potential for motion-corrected whole-heart 4D flow imaging in the fetus using stacks of highly accelerated 2D bSSFP slices, which are inherently sensitive to velocity. Real-time acquired images were aligned in space and cardiac phase, and vectorially combined to yield time-resolved flow information.
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