What is the average intensity across the entire sound beam?

What is the average intensity across the entire sound beam?

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

Answer: (A)

In ultrasound, intensity is power per area. When we say the average across the entire sound beam, we’re averaging the intensity values over every point in the beam’s cross-section. This is the spatial average intensity. It differs from the spatial peak, which is simply the highest intensity found at any point within the beam, and from temporal average, which averages intensity over time (important for pulsed beams). Pulse average describes the average during the pulse itself. So the value that represents the whole-beam average is the spatial average.

In ultrasound, intensity is power per area. When we say the average across the entire sound beam, we’re averaging the intensity values over every point in the beam’s cross-section. This is the spatial average intensity. It differs from the spatial peak, which is simply the highest intensity found at any point within the beam, and from temporal average, which averages intensity over time (important for pulsed beams). Pulse average describes the average during the pulse itself. So the value that represents the whole-beam average is the spatial average.