Which modality uses sound waves to visualize internal structures?

Which modality uses sound waves to visualize internal structures?

• A. Sonography
• B. Positron emission tomography
• C. Magnetic resonance imaging
• D. Fluoroscopy

Answer: (A)

Sound waves imaging is ultrasound, also called sonography. It uses a handheld transducer that emits high-frequency sound waves into the body. As these waves travel, they encounter tissues with different acoustic impedances and are reflected back as echoes. The transducer detects these echoes and the machine converts them into real-time images of internal structures. This method avoids ionizing radiation and is excellent for examining soft tissues, guiding procedures, and assessing movement or blood flow with additional Doppler techniques if needed. In contrast, PET relies on radioactive tracers to image metabolic activity, MRI uses magnetic fields and radiofrequency pulses for detailed soft-tissue contrast, and fluoroscopy uses X-ray radiation to produce real-time radiographs. Therefore, the modality that uses sound waves to visualize internal structures is ultrasound (sonography).

Sound waves imaging is ultrasound, also called sonography. It uses a handheld transducer that emits high-frequency sound waves into the body. As these waves travel, they encounter tissues with different acoustic impedances and are reflected back as echoes. The transducer detects these echoes and the machine converts them into real-time images of internal structures. This method avoids ionizing radiation and is excellent for examining soft tissues, guiding procedures, and assessing movement or blood flow with additional Doppler techniques if needed. In contrast, PET relies on radioactive tracers to image metabolic activity, MRI uses magnetic fields and radiofrequency pulses for detailed soft-tissue contrast, and fluoroscopy uses X-ray radiation to produce real-time radiographs. Therefore, the modality that uses sound waves to visualize internal structures is ultrasound (sonography).