Abstract
Background Fetal cardiovascular MRI has been hampered by the lack of a reliable cardiac gating signal. A recently proposed solution to this problem is metric optimized gating (MOG) [1-3]. Here, we demonstrate the ability of MOG to acquire images of the fetal myocardium without conventional cardiac gating. Our work is motivated by the need for high-resolution dynamic imaging in the assessment of fetal congenital heart disease [4].
Highlights
Fetal cardiovascular MRI has been hampered by the lack of a reliable cardiac gating signal
In the four chamber view (Figure 2), longitudinal contraction of the heart can be appreciated by comparing the position of the atrioventricular groove on the systolic and diastolic images
Data were retrospectively sorted and reconstructed using hypothetical cardiac triggers. The positions of these triggers were iteratively adjusted according to the metric optimized gating (MOG) method until a metric for image quality was optimized [1,2,5]
Summary
Fetal cardiovascular MRI has been hampered by the lack of a reliable cardiac gating signal. Better appreciated on the moving cine series, intracardiac structures can be identified in both figures. The short axis images at mid ventricular (Figure 1) level demonstrate the LV papillary muscles, the moderator band of the RV and show thickening of the myocardium in systole.
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