Harmonics reduces _____ and _____.

Harmonics reduces _____ and _____.

• A. Clutter and side lobe artifacts
• B. Noise
• C. Speckle
• D. Shadowing

Answer: (A)

Harmonic imaging uses the second harmonic signal generated by tissue as the ultrasound wave travels. The system transmits at the fundamental frequency but listens for the harmonic frequency, which tissue produces more strongly along the main beam and much less from off-axis regions. Because clutter echoes and side-lobe artifacts come from unwanted energy that often originates from off-axis reflectors, the harmonic signal is less contaminated by those contributions. The result is a cleaner image with fewer clutter echoes and reduced side-lobe artifacts, improving contrast and overall image quality. This technique isn’t primarily about reducing noise, speckle, or shadowing, though those aspects are separate imaging considerations.

Harmonic imaging uses the second harmonic signal generated by tissue as the ultrasound wave travels. The system transmits at the fundamental frequency but listens for the harmonic frequency, which tissue produces more strongly along the main beam and much less from off-axis regions. Because clutter echoes and side-lobe artifacts come from unwanted energy that often originates from off-axis reflectors, the harmonic signal is less contaminated by those contributions. The result is a cleaner image with fewer clutter echoes and reduced side-lobe artifacts, improving contrast and overall image quality. This technique isn’t primarily about reducing noise, speckle, or shadowing, though those aspects are separate imaging considerations.