Which statement best describes the advantage of MI and TI indices for safety ALARA practice?

Which statement best describes the advantage of MI and TI indices for safety ALARA practice?

• A. The system will automatically adjust parameters to limit exposure under adverse conditions.
• B. The system will beep to notify the sonographer when indices are too great.
• C. The system will shut down when exposure becomes too great.
• D. Information is available on the screen to help the sonographer implement the ALARA principle.

Answer: (D)

MI and TI indices provide real-time, quantitative feedback on potential bioeffects, and this information is displayed on the screen to guide safe practice. MI reflects the risk of mechanical effects from the ultrasound beam, while TI estimates the potential for tissue heating. Having these readouts lets the sonographer make informed adjustments to output power, duty cycle, depth, and focusing to keep exposure as low as reasonably achievable. They’re not automatic shutoffs or alarms by themselves, though such features may exist; the key advantage is the active, on-screen information that supports ALARA decisions.

MI and TI indices provide real-time, quantitative feedback on potential bioeffects, and this information is displayed on the screen to guide safe practice. MI reflects the risk of mechanical effects from the ultrasound beam, while TI estimates the potential for tissue heating. Having these readouts lets the sonographer make informed adjustments to output power, duty cycle, depth, and focusing to keep exposure as low as reasonably achievable. They’re not automatic shutoffs or alarms by themselves, though such features may exist; the key advantage is the active, on-screen information that supports ALARA decisions.