Ultrasound Physics Test 1 Practice

What effect does increasing duty factor have on energy deposition and heating risk?

Decreases energy deposition Has no effect on energy deposition Increases energy deposition and heating risk Only affects Doppler sensitivity

Correct Answer:

Increases energy deposition and heating risk

Explanation:

Increasing the duty factor means the beam is on for a greater fraction of time, so more acoustic energy is delivered to tissue over each second. Heating in tissue depends on time-averaged energy deposition, not just the instantaneous power, so raising the duty factor raises the time-averaged intensity and the associated heating risk. The other ideas don’t fit because energy deposition does change with duty factor, and Doppler sensitivity is not the primary effect of changing duty factor.

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