What should I do if the four-dimensional imaging always fails to capture the heart?

If the fetal heart cannot be visualized clearly during a 4D color ultrasound, it may be due to the fetal position being unfavorable for observation. For this situation, the following measures can be taken: 1. Adjust the examination timing: Ensure the examination is performed at the appropriate gestational age (e.g., 18–22 weeks), when the fetal cardiac structures are relatively clear and easier to observe. 2. Maternal physical activity: The pregnant woman can engage in mild physical activity before or during the examination, such as walking or gently tapping the abdomen, to change the fetal position and make the heart easier to visualize. 3. Adjustment of scanning technique by the physician: The physician can attempt to obtain clearer cardiac images by adjusting the position and angle of the ultrasound probe or by changing the maternal position (e.g., from supine to lateral decubitus). 4. Maintain relaxation: The pregnant woman should stay calm and relaxed before the examination, avoiding tension and anxiety, which can help the fetus remain in a stable state and facilitate cardiac observation. 5. Repeat examinations: If the heart cannot be adequately visualized during the initial examination, repeated scans can be performed under the guidance of a physician to ensure diagnostic accuracy.