Tissue harmonics are created during transmission; Contrast harmonics are created during receiving. Which pairing is correct?

Tissue harmonics are created during transmission; Contrast harmonics are created during receiving. Which pairing is correct?

• A. Tissue during Transmission; Contrast during Receiving
• B. Tissue during Receiving; Contrast during Transmission
• C. Tissue during Transmission; Contrast during Transmission
• D. Tissue during Receiving; Contrast during Receiving

Answer: (A)

Harmonics in ultrasound imaging come from nonlinear interactions, and when they are generated depends on the medium and the situation. Tissue harmonics are produced as the ultrasound wave travels through tissue; the tissue’s nonlinear properties distort the wave, creating second-harmonic frequencies during transmission. The imaging system then receives and isolates these harmonics to form the image. Contrast harmonics come from microbubble contrast agents, which respond nonlinearly to the transmitted beam and emit harmonic energy as they oscillate. This harmonic signal is predominantly detected on receive, allowing the image to highlight the contrast agent. So, tissue harmonics are generated during transmission, while contrast harmonics are generated during receiving.

Harmonics in ultrasound imaging come from nonlinear interactions, and when they are generated depends on the medium and the situation. Tissue harmonics are produced as the ultrasound wave travels through tissue; the tissue’s nonlinear properties distort the wave, creating second-harmonic frequencies during transmission. The imaging system then receives and isolates these harmonics to form the image.

Contrast harmonics come from microbubble contrast agents, which respond nonlinearly to the transmitted beam and emit harmonic energy as they oscillate. This harmonic signal is predominantly detected on receive, allowing the image to highlight the contrast agent.

So, tissue harmonics are generated during transmission, while contrast harmonics are generated during receiving.