Which term would you use to describe the potential for bubble formation under ultrasound exposure?

Which term would you use to describe the potential for bubble formation under ultrasound exposure?

• A. Mechanical Index
• B. Spatial Peak
• C. Pulse Average
• D. Temporal Average

Answer: (A)

Bubble formation under ultrasound exposure is driven by cavitation from the negative pressure swings in the wave. The Mechanical Index specifically quantifies this risk by combining how strong the peak negative (rarefaction) pressure is with the ultrasound frequency; higher MI means a greater potential for microbubbles to form and cavitate. It’s calculated as the peak rarefaction pressure (in MPa) divided by the square root of the frequency (in MHz). Spatial Peak describes where the beam is most intense, while Temporal Average and Pulse Average relate to energy over time or per pulse; neither directly reflects the pressure conditions that promote cavitation.

Bubble formation under ultrasound exposure is driven by cavitation from the negative pressure swings in the wave. The Mechanical Index specifically quantifies this risk by combining how strong the peak negative (rarefaction) pressure is with the ultrasound frequency; higher MI means a greater potential for microbubbles to form and cavitate. It’s calculated as the peak rarefaction pressure (in MPa) divided by the square root of the frequency (in MHz). Spatial Peak describes where the beam is most intense, while Temporal Average and Pulse Average relate to energy over time or per pulse; neither directly reflects the pressure conditions that promote cavitation.