Which imaging modality can be used to visualize the fetal heart?

• A. M-mode sonography
• B. Sonography
• C. Echocardiography
• D. Cardiac sonography applications

Answer: (A)

Imaging the fetal heart relies on ultrasound, and there are different modes to capture its function. M-mode sonography records motion along a single line over time, which makes the beating heart easy to track. With this one-dimensional time trace, you can observe cardiac cycle timing, valve motion, and overall heart rate, providing clear dynamic information about fetal cardiac activity. While general sonography covers imaging of the fetus and echocardiography refers to the broader heart-imaging approach (including 2D images and Doppler), M-mode emphasizes the rapid, time-based visualization of cardiac motion itself. That focused ability to visualize and quantify the motion of the fetal heart is why this modality is the best choice in this context.