If peak negative pressure remains constant but frequency is increased, how does the mechanical index change?

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Multiple Choice

If peak negative pressure remains constant but frequency is increased, how does the mechanical index change?

Explanation:
Mechanical Index reflects cavitation risk and is defined as the peak negative pressure divided by the square root of frequency (with frequency in MHz). If the peak negative pressure stays the same and you raise frequency, the denominator grows as sqrt(f), so the MI drops. For example, with a constant Pneg, doubling the frequency reduces MI by about a factor of sqrt(2). This means higher-frequency ultrasound has a lower cavitation potential at the same peak negative pressure.

Mechanical Index reflects cavitation risk and is defined as the peak negative pressure divided by the square root of frequency (with frequency in MHz). If the peak negative pressure stays the same and you raise frequency, the denominator grows as sqrt(f), so the MI drops. For example, with a constant Pneg, doubling the frequency reduces MI by about a factor of sqrt(2). This means higher-frequency ultrasound has a lower cavitation potential at the same peak negative pressure.

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