Intensity ranges from?

Intensity ranges from?

• A. .001 to 100 W/cm^2
• B. .01 to 150 W/cm^2
• C. .01 to 300 W/cm^2
• D. .1 to 500 W/cm^2

Answer: (C)

Intensity is the energy delivered by the ultrasound beam per unit area each second. It can vary a lot because it depends on how powerful the transducer is, where the beam is focused, and whether the beam is on continuously or in pulses. Because of those factors, the practical range of intensity spans from very small values used for safe, everyday imaging to much higher values used in therapeutic or high-output modes. A representative broad range is about 0.01 W/cm^2 up to 300 W/cm^2, which covers typical imaging levels at the low end and higher-power exposures at the high end. The other ranges either miss the low-power imaging level or the high-power end, so this broad span best fits the real-world capabilities and uses of ultrasound energy.

Intensity is the energy delivered by the ultrasound beam per unit area each second. It can vary a lot because it depends on how powerful the transducer is, where the beam is focused, and whether the beam is on continuously or in pulses. Because of those factors, the practical range of intensity spans from very small values used for safe, everyday imaging to much higher values used in therapeutic or high-output modes. A representative broad range is about 0.01 W/cm^2 up to 300 W/cm^2, which covers typical imaging levels at the low end and higher-power exposures at the high end. The other ranges either miss the low-power imaging level or the high-power end, so this broad span best fits the real-world capabilities and uses of ultrasound energy.