Which imaging modality visualizes the heart by introducing high-frequency sound waves through the chest?

• A. CT Angiography
• B. Echocardiography
• C. Nuclear Cardiac Scan
• D. MRI

Answer: (B)

High-frequency sound waves introduced through the chest are used in ultrasound imaging of the heart. This technique, echocardiography, uses a chest-worn transducer to emit sound waves and capture the echoes from heart structures, producing real-time images of chamber size, wall motion, and valve function, often with Doppler to assess blood flow. It’s noninvasive and does not involve ionizing radiation. The other modalities rely on different principles: CT angiography uses X-rays with contrast to image vessels, Nuclear Cardiac Scan uses radioactive tracers to evaluate perfusion, and MRI uses magnetic fields to visualize cardiac tissue and motion.