Which term denotes the intensity value at the beam's maximum location?

Which term denotes the intensity value at the beam's maximum location?

• A. Pulse average intensity Ipa
• B. Temporal
• C. Spatial average intensity Isa
• D. Spatial peak intensity or Isp

Answer: (D)

In ultrasound beams, intensity varies across space, with a hot spot where the energy concentrates the most. The intensity value at that hottest location across the beam’s cross-section is called the spatial peak intensity, Isp. This descriptor specifically targets the maximum in space, unlike spatial‑average intensity, which averages across the entire cross-section and tends to be lower because it includes cooler areas. It’s also different from temporal measures that look at how intensity changes over time at a single point. So the value at the beam’s maximum location is Isp.

In ultrasound beams, intensity varies across space, with a hot spot where the energy concentrates the most. The intensity value at that hottest location across the beam’s cross-section is called the spatial peak intensity, Isp. This descriptor specifically targets the maximum in space, unlike spatial‑average intensity, which averages across the entire cross-section and tends to be lower because it includes cooler areas. It’s also different from temporal measures that look at how intensity changes over time at a single point. So the value at the beam’s maximum location is Isp.