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The answer indicating that the risk is minimal, but thermal and mechanical indices are monitored, is correct because ultrasound technology is generally considered safe for diagnostic imaging. The energy from ultrasound relies on sound waves, and when used within recommended guidelines and by trained practitioners, the risks of significant tissue damage are low.

The thermal index measures the potential increase in temperature that can occur due to the absorption of ultrasound energy in tissues. The mechanical index evaluates the likelihood of mechanical effects, such as cavitation, which could potentially affect tissue. Monitoring these indices helps ensure that ultrasound procedures are performed safely, minimizing any risk of harm to the patient.

While extended exposure could theoretically pose some risks, the actual incidence of harm in the clinical setting is very low, especially when ultrasound is used appropriately. This makes the assertion that there is minimal risk a reasonable conclusion, emphasizing the importance of monitoring specific indices during ultrasound usage.