Contrast harmonics are created while which process?

Contrast harmonics are created while which process?

• A. Receiving
• B. Transmission
• C. Reflection
• D. Scattering

Answer: (A)

Contrast harmonics come from the nonlinear response of microbubble contrast agents when they are insonated. This nonlinear behavior generates echoes that contain frequencies at multiples of the transmitted frequency. The imaging system then isolates these harmonic components during reception and uses them to form the image. In other words, while the bubbles create the harmonic content in the echo, the process that makes use of those harmonics—filtering, demodulating, and reconstructing the image—occurs in the receiving stage.

Contrast harmonics come from the nonlinear response of microbubble contrast agents when they are insonated. This nonlinear behavior generates echoes that contain frequencies at multiples of the transmitted frequency. The imaging system then isolates these harmonic components during reception and uses them to form the image. In other words, while the bubbles create the harmonic content in the echo, the process that makes use of those harmonics—filtering, demodulating, and reconstructing the image—occurs in the receiving stage.