Ultrasound Physics II Practice Exam

What is the key difference between fundamental and harmonic imaging regarding tissue interaction?

Fundamental uses transmitted frequency; harmonic imaging uses nonlinear tissue response to generate harmonics, improving contrast and resolution Fundamental uses harmonic generation; harmonic uses transmitted frequency Fundamental uses tissue response to noise; harmonic uses echoes Fundamental uses the second harmonic; harmonic uses the first harmonic

Correct Answer:

Fundamental uses transmitted frequency; harmonic imaging uses nonlinear tissue response to generate harmonics, improving contrast and resolution

Explanation:

Fundamental imaging relies on the tissue responding in a linear way to the transmitted ultrasound, so the echoes come back at the same frequency that was sent. Harmonic imaging, by contrast, uses the tissue’s nonlinear response to the ultrasound to generate new frequencies (multiples of the transmitted frequency, with the second harmonic being the most used). The image is formed from these harmonic components, which tends to improve contrast and resolution and reduce certain artifacts. This is why the correct description is that fundamental uses the transmitted frequency, while harmonic imaging relies on nonlinear tissue generation of harmonics to provide the image.

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